Published by De Gruyter

Volume 42 Issue 6

Issue of Zeitschrift für Naturforschung B

Contents
Journal Overview

Publicly Available June 2, 2014

Titelei

Page range: i-ii

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Open Access June 2, 2014

Ultramarin-Gelb II: Herstellung und Charakterisierung einer Rarität / Ultramarine-Yellow II: Preparation and Characterization of a Rarity

P. Köhler, G. Winter, F. Seel, K.-P. Klos

Page range: 663-665

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Abstract

The missing link in the series of ultramarine pigments, a synthetic sodalite containing yellow S 2 - ions, was prepared by thermal decomposition of a thiocyanate sodalite under vacuum or nitrogen. The nature of the product has been elucidated through X-ray powder analysis, VIS/UV-and ESR-spectrometric measurements, and by the observation of the brilliant red fluorescence of the sulfur radical ion S 2 - .

Open Access June 2, 2014

Zum Einbau von einigen Lanthaniden in Gd₂Cl₃ / Incorporation of Some Lanthanides into Gd₂Cl₃

A. Simon, Hj. Mattausch, N. B. Mikheev, C. Keller

Page range: 666-668

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Abstract

Co-crystallization experiments with radioactive isotopes of lanthanides (Ce, Nd, Eu, Gd, Tb, Dy, Tm, Yb) show that only Tb is incorporated by Gd 2 Cl 3 in a significant amount. The results are discussed in terms of the electronic configuration of Ln 2+ ions as well as redox potentials E°(Ln 3+ /Ln 2+ ).

Open Access June 2, 2014

Zur Charakterisierung zweier polymerer Kohlenstoffselenide / Characterization of Two Polymerie Carbon Selenides

Heinz P. Fritz, Michael Weis

Page range: 669-673

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Abstract

A structure is suggested for the (amorphous) polymeric carbon selenide, (C 2 Se 3 ) n , - obtained by heating (CSe 2 ) n in vacuum - on the basis of spectroscopic and electrochemical data.

Open Access June 2, 2014

(tert-C₄H₉)₃ PTe — ein typisches Tellurophosphoran? [1] / (ferr-C₄H₉)₃ PTe -a Typical Tellurophosphorane? [1]

Norbert Kuhn, Hans Schumann, Gotthelf Wolmershäuser

Page range: 674-678

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Abstract

The P - Te bond length in (tert-C 4 H 9 ) 3 PTe of 2.368 Å corresponds to a bond order near 1.5. The distance may be influenced by the tert-C 4 H 9 groups, but the 125 Te NMR shift is well within the common R 3 PTe range, while 1 J( 125 Te- 31 P) is about 140 Hz smaller than in other tellurophosphoranes.

Open Access June 2, 2014

Zur Darstellung und Kristallstruktur PbZn(NCS)₄ / Synthesis and Crystal Structure of PbZn(NCS)₄

K. Brodersen, H. Procher, Hans-U. Hummel

Page range: 679-681

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Abstract

PbZn(NCS) 4 is obtained from the binary compounds Pb(SCN) 2 and Zn(NCS) 2 with traces of water in an ultra-sound bath. The space group of the complex is Pn2 1 a (standard: Pna2 1 ) with Z = 4. The structure consists of cis-connected octahedra 2 ∞ [PbS 2 S 4/2 ] forming two-dimensional layers. All SCN-groups are bound to Zn 2+ via their N atoms. The resulting ZnN 4 tetrahedra are arranged in the cavities formed by the PbS 6 octahedra.

Open Access June 2, 2014

Photolyse von elementarem Schwefel (S₆ , S₇ , S₈ , S₁₀ , S₁₂ ) in Kohlenstoffdisulfidlösung [1] / Photolysis of Elemental Sulfur (S₆, S₇, S₈, S₁₀, S₁₂) in Carbondisulfide Solution [1]

Eva-Maria Strauss, Ralf Steudel

Page range: 682-690

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Abstract

The photochemical decomposition of pure carbondisulfide as well as of solutions of pure S 6 , S 7 , S 8 , S 10 and S 12 , respectively, in CS 2 at 15 °C on irradiation by a high-pressure mercury lamp (200-600 nm) has been studied by quantitative HPLC analysis of the soluble products. In all cases mixtures of sulfur homocycles S n (n = 5,6, ...) are formed with S 8 , S 7 and S 6 being the dominating species, but traces of S 5 , S 9 , S 10 and S 12 have also been observed in most cases. S 5 has been identified for the first time; it is formed in particular in the photolysis of S 7 in CS 2 . All irradiated sulfur solutions reach more or less the same photostationary equilibrium, but the decomposition of CS 2 increases linearly with time and its effects are superimposed on the S n interconversion reactions.

Open Access June 2, 2014

³⁴S-Isotopenaustausch zwischen flüssigem Kohlenstoffdisulfid und elementarem Schwefel [1] / Sulfur-³⁴ Isotopic Exchange between Liquid Carbondisulfide and Elemental Sulfur [1]

Ralf Steudel, Birger Holz

Page range: 691-694

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Abstract

The exchange of sulfur isotopes between liquid carbondisulfide and dissolved elemental sulfur-34 (S 6 , S 7 , S 8 , S 9 , S 10 , S 12 ) was studied by Raman spectroscopy. No exchange was observed within 4 h at temperatures below 200 °C. Prolonged heating to 200 °C results in a slow exchange (half-life >300 h) as observed by the intensity increase of the symmetric stretching vibration of C 32 S 34 S measured at -120 °C.

Open Access June 2, 2014

Zur Synthese von Tetra-p-tolyldibismutan und dessen Spaltung mit Diphenyldichalkogeniden, elementarem Schwefel, Selen und p-Benzochinon / Synthesis of Tetra-p-tolyldibismuthane and its Cleavage with Diphenyl Dichalcogenides, Elemental Sulfur, Selenium and p-Benzoquinone

Markus Wieber, Ingbert Sauer

Page range: 695-698

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Abstract

(p-CH 3 C 6 H 4 ) 4 Bi 2 is obtained from ditolylbismuth bromide with sodium in liquid ammonia. The compound reacts with selenium, sulfur or p-benzoquinone with increasing rate to the corresponding (R 2 Bi) 2 E-derivatives (E = S, Se, 1,4-C 6 H 4 O 2 ). Reactions of the dibismuthane with equimolar amounts of diphenyl dichalcogenides produce phenylchalcogenobismuthanes of the general formula (p-CH 3 C 6 H 4 )2BiEC 6 H 5 (E - S, Se, Te).

Open Access June 2, 2014

Trithiadiazyl-hexafluorarsenate S₃N₂X⁺AsF₆^- / Trithiadiazyl-hexafluoroarsenates S₃N₂X⁺AsF₆^-

D. K. Padma, R. Mews

Page range: 699-702

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Abstract

The preparation of trithiadiazyl-hexafluoroarsenates by three different methods is reported: (a) reaction of S 3 N 2 Cl 2 (3) with AgAsF 6 (to give S 3 N 2 Cl + ASF 6 - ), (b) halogen or radical addition to S 3 N 2 + ASF 6 - to give S 3 N 2 Br + AsF 6 - (5) or S 3 N 2 ON(CF 3 ) 2 + ASF 6 - (6), and (c) cycloaddition of NSF to the NS 2 + -cation to give S 3 N 2 F + AsF 6 - (9).

Open Access June 2, 2014

Application of Reverse Two-Dimensional ¹H{¹⁵N} NMR Spectroscopy to the Characterization of Two Inorganic Compounds:

Bernd Wrackmeyer, Klaus Schamel, Karlheinz Guldner, Max Herberhold

Page range: 703-706

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Abstract

The inorganic ring system linked to the [Cr(CO) 5 ] fragment [R = t Bu (1), NH2 (2)], has been studied by reverse two-dimensional, 2D, 1 H{ 15 N} NMR spectroscopy. In solution, the exchange of the N-H hydrogen atoms is slow on the NMR time scale. Chemical shifts δ( 1 H), δ( 13 C), δ( 31 P), δ( 15 N) and coupling constants 1 J( 31 P 1 H), 2 J( 31 P 13 C), 1 J( 31 P 15 N) are reported. In the case of 2, the reduced coupling constants 2 K( 31 PN 1 H) and 1 K( 31 P 15 N) have the same sign.

Open Access June 2, 2014

X-Ray Structures of Several Bis(N-alkylsalicylaldiminato)zinc(II) Complexes

Michael Dreher, Horst Elias, Helmut Paulus

Page range: 707-710

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Abstract

X-ray structures of five bis(N - R-salicylaldiminato)zinc(II) complexes with R = ethyl, n-propyl, i-propyl, n-butyl and 4-thia-n-hexyl were determined. The N 2 O 2 coordination geometry is in all cases quasi-tetrahedral with the dihedral angle between the planes of the two chelate rings ranging from 84 to 89°. Bond lengths and angles in the coordination sphere are not affected by the nature of R or by a methoxy substituent in 4-position of the salicylaldimine. The potentially tridentate ONS ligand N(4-thia-n-hexyl)salicylaldimine is also coordinated only in a bidentate NO fashion.

Open Access June 2, 2014

Bis(acetylen)komplexe des Niobs und Tantals / Bis-acetylene Complexes of Niobium and Tantalum

H. G. Alt, H. E. Engelhardt

Page range: 711-714

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Abstract

The photo-induced reaction of C 5 Me 5 M(CO) 4 complexes (M = Nb, Ta) with excess alkynes R 1 C 2 R 2 (R 1 , R 2 = H, Me, Ph, Hex) in pentane solution results in the formation of the bis-acetylene complexes C 5 Me 5 M(R 1 C 2 R 2 ) 2 CO. In these complexes the π-bonded acetylene ligands behave formally as three electron ligands.

Open Access June 2, 2014

Organoborierung von Alkinylstannanen, XX [1] Oligomerisation von 1-Propinyltrimethylstannan / Organoboration of Alkynylstannanes, XX [1] Oligomerisation of 1-Propynyltrimethylstannane

Christoph Bihlmayer, Susanna Kerschl, Bernd Wrackmeyer, Christoph Bihlmayer, Susanna Kerschl, Bernd Wrackmeyer

Page range: 715-719

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Abstract

1-Propynylstannane (1) reacts with B-ethyl-9-borabicyclo[3.3.1]nonane (10) (ratio 2:1) to giva a new butadiene derivative (11). Attempts to oligomerize 1 by organoboration with trimethyl-borane (13) (ratio 2:1) lead to a hexatriene derivative (14). A larger excess of 1 (5:1) gives a mixture of higher oligomers, analogous to 14. The proposed structures of the new compounds 11, 14 are supported by 11 B, 13 C and 119 Sn NMR and mass spectra.

Open Access June 2, 2014

Metallkomplexe funktioneller Isocyanide, XIV [1] [3+2]-Cycloadditionen zwischen Metallo-Nitrilyliden und CS 2 und Carbenübertragung: Thiazolin-2-yliden-Komplexe von Chrom, Wolfram und Palladium / Metal Complexes of Functional Isocyanides, XIV [1] [3+2] Cycloadditions between Metallo Nitrile Ylids and CS 2 and Carbene Transfer: Thiazoline-2-ylidene Complexes of Chromium, Tungsten and Palladium

Wolf Peter Fehlhammer, Dagobert Achatz, Ulrike Plaia, Alfons Völkl

Page range: 720-727

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Abstract

Metal-coordinated α-deprotonated ethyl isocyanoacetate reacts with carbon disulfide in a [3+2]- cycloaddition to give 1.3-thiazolin-2-ylidene complexes, the exo-sulfur function of which has been methylated and coordinated to platinum. The structure of (3) has been determined by X-ray methods. Inter alia, a surprising shortage of electron derealization in the heterocycle and strong hydrogen bonding between pairs of molecules through their NH- and CO-ester groups have been found. On reacting 3 with PdCl2(η-cyclooctadiene-1,5), carbene transfer occurs to give .

Open Access June 2, 2014

The Chemistry of Silica Supported Chromium Ions Nitric Oxide Complexes and their Interaction with CO and Pyridine

Edoardo Garrone, Giovanna Ghiotti, Claudio Morterra, Adriano Zecchina

Page range: 728-738

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Abstract

Three kinds of Cr(II) ions are present on CO reduced CrO 3 /SiO 2 samples (labelled A, B. and C), having two, three and four oxygen ligands before chemisorption, respectively. The population of Cr A , Cr B and Cr c on a standard sample is evaluated to be: 52%, 28%, 20%, respectively. The number of oxygen ligands determines the actual charge of the ions, increasing in the series A, B, and C, as well as the ability to coordinate further ligands. CrA (coinciding with that proposed by Krauss) yields, upon NO chemisorption, dinitrosylic species at an angle of 125°: the presence of a third coordinative vacancy at least allows coordination of CO leading to Cr A (NO) 2 CO and of pyridine, leading simultaneously to Cr A (NO) 2 Py and Cr A (NO)Py 2 . This latter species may be converted into Cr A (NO)Py. Cr B (for which a structure slightly different from Krauss’ one is proposed) forms dinitrosylic species at an angle of 123°, with spectral features very close to those of Cr(III)(NO) 2 : no reaction occurs with CO, and, by pyridine adsorption, a Cr B (NO)Py species is formed. Cr c ions form, at low NO pressures, mononitrosylic species undergoing ligand displacement with either CO or pyridine; at high NO pressures,Cr c (NO) 2 species are formed, at an angle of 109°, which show no reactivity with CO and a displacement reaction with pyridine: a species Cr c (NO)Py is however not formed. Cr A and Cr B behaviour is that of isolated species; Cr c ions show, by the constant presence of shifts in the relevant NO frequencies upon NO coverage, that they are in electronic interaction.

Open Access June 2, 2014

Darstellung, Charakterisierung und Röntgenstrukturanalyse von η⁵ -Pentamethylcyclopentadienyl-bis(methylsulfido)carbonylrhenium, CpRe(CO)(SMe)₂ / Preparation, Characterization and X-Ray Structure Analysis of η⁵-Pentamethylcyclopentadienyl-bis(methylsulfido)carbonylrhenium, CpRe(CO)(SMe)₂

Max Herberhold, Bertram Schmidkonz, Manfred L. Ziegler, Orhan Serhadle

Page range: 739-745

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Abstract

Reaction of the tetrahydrofuran-stabilized 16-electron complex fragment [Cp*Re(CO) 2 ] with dimethyl disulfide, MeSSMe, leads to the diamagnetic title compound, Cp*Re(CO)(SMe) 2 , which was characterized by mass, IR and NMR spectra and by an X-ray crystal structure analysis**. The two methylsulfido ligands are bent (angles Re-S-CH 3 114.1(3)°) and turned away from the Cp* ring. The Re - S-bond distances are 227.0(2) pm.

Open Access June 2, 2014

The Defect Structure of CdO

Jenő Juhász, Sarolta Igaz, Béla Jóvér, Zoltán G. Szabó

Page range: 746-749

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Abstract

Defect Sites of CdO, Reducibility, Analysis Three procedures of chemical analysis are proposed for the direct determination of excess Cd in CdO: a spectrophotometric, a titrimetric and a gravimetric one, for 0-1500 ppm, 500-50,000 ppm and above 5%, respectively. The good reproducibility and reliability is illustrated by results referring to CdO samples heat-treated in H 2 and in air between 100 and 350 °C. Reduction in H2 increases the concentration of excess Cd up to 4000 ppm, above that separate Cd phase forms. The excess Cd in solid solution (interstitial sites) is more resistant against re-oxidation, than the bulk Cd phase.

Open Access June 2, 2014

Beiträge zur Chemie der Schwefel-Halogenide, 17 [1] Dimethyl(methylthio)-und Dimethyl(phenylthio)sulfonium-Salze / Contributions to the Chemistry of Sulfur Halides, 17 [1] Dimethyl(methylthio)-and Dimethyl(phenylthio)sulfonium Salts

R. Minkwitz, H. Prenzel, H. Pritzkow

Page range: 750-755

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Abstract

IR, Raman and NMR spectroscopic studies of dimethyl(methylthio)-and dimethyl(phenyl-thio)sulfonium salts (CH 3 ) 2 SSR + A - (R = CH 3 , C 6 H 5 ; A = AsF 6 - , SbCl 6 - ) are reported. The crystal structure of (CH 3 ) 2 SSCH 3 + AsF 6 - shows for the cation a conformation different from that reported for the hexachloroantimonate.

Open Access June 2, 2014

Über die Photolumineszenz von Oberflächenverbindungen des Molybdäns auf Silicagel / On the Photoluminescence of Molybdenum Surface Compounds on Silicagel Supports

Peter Morys, Sabine Schmerbeck

Page range: 756-763

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Abstract

The UV induced photoluminescence (PL) of activated and reduced surface molybdenum compounds on silica gel has been studied at various concentrations of the products under He and Ar and at various temperatures from R.T. to 10 K. With the activated molybdenum(VI) compounds, four different types of broad band emissions were observed and assigned to definite surface species of Mo(VI): A blue PL occurring mainly at T > -90 °C, two "white" emissions with different spectral excitation regions and Stokes shifts appearing very strongly under He or vacuum below T < -90 °C and a yellow PL occurring with the products under Ar, N2 or C02 instead of the "white" ones. While the blue PL was ascribed to an octahedrally coordinated surface species (Moc1), the two "white" emissions were attributed to two tetrahedrally coordinated surface species, the first one (MoX1) being monomeric and bonded directly to the surface, the second one (Mo^1) being bonded to a polymolybdate cluster and excited via that cluster; the yellow PL was postulated to originate from a MOB1-Ar Van der Waals complex. At 10 K the "white" PL of the polymeric MOB1 species showed a faint vibronic fine structure; the emission time constant was measured to be 5 ms. With the reduced compounds, only one PL was observed attributable to the monomeric MoX1 species. Hence this species was concluded to be the only one not or not completely being reducible.

Open Access June 2, 2014

Über die Reaktion von Chromocen mit einem Co/Kieselgel-Träger / On the Reaction of Chromocene with a Co/Silica Gel Support

Bernd Rebenstorf

Page range: 764-768

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Abstract

The IR spectra of the modified chromocene/Co/silica gel catalyst show a band at 3118 cm" 1 of the cyclopentadienyl ligand, which is shifted by -1-20 cm' 1 compared to the unmodified chromocene/silica gel catalyst. The comparably slow CO adsorption yields two bands at low Cr concentration (-0.1% Cr) at 2065 and 2022 cm" 1 and two more at higher Cr concentration (-1% Cr) at 2028 and 1961 cm -1 . Both band pairs are significantly different from that observed with the "normal" chromocene/silica gel catalyst at 2046 and 1974 cm -1 . No CO IR bands at low wavenumbers were observed with the modified catalyst. Polymerisation measurements showed a slightly lower concentration of catalytically active sites (35% of Cr) for the modified catalyst compared to the unmodified one (50%), while the poly-merisation activity decreased by a factor of four (Cr concentration: 0.083%). It was concluded that the surrounding of the dimeric surface site is changed by Co on the silica gel surface of the chromocen catalyst and that this change is important for the CO adsorption and the polymerisation activity.

Open Access June 2, 2014

Untersuchungen von Polymerisations-und Metathesereaktionen, X. Mitt. [1] Polymerisation, Trimerisation und Metathese von Allenen und Heteroallenen mit reduziertem Phillips-Katalysator / Studies of Polymerisation and Metathesis Reactions, Part X [1] Polymerisation, Trimerisation and Metathesis of Allenes and Heteroallenes with Reduced Phillips Catalyst

Karin Weiss, Kurt Hoffmann

Page range: 769-773

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Abstract

The reduced Phillips Catalyst - a surface chromium(II) on silica - catalyses the polymerisation of the allene 1,2-butadiene to yield predominantly 1,2-polybutadiene, yields trimerisation products with isocyanates, and gives metathesis of 2 differently substituted carbodiimides.

Open Access June 2, 2014

Übergangsmetall-substituierte Diphosphene, VI [1]Zur Reaktivität von Diphosphenylkomplexen des Eisens und Rutheniums gegenüber Tetracarbonylnickel / Transition Metal Substituted Diphosphenes, VI [1] On the Reactivity of Diphosphenyl Complexes of Iron and Ruthenium towards Tetracarbonyl Nickel

Lothar Weber, Georg Meine

Page range: 774-776

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Abstract

The diphosphenyl complexes (?/ 5 -CsMe0(CO 2)M-P = P-Ar (8) (M = Fe, Ru; Ar = 2,4,6-rm-BU,C 6 H 2) react with excess Ni(CO) 4 to yield the adducts (77 5 -C 5 Me 5)(CO) 2 M[Ni(CO) 3 ]P=PAr (9). The products have been characterized by elemental analysis as well as by spectroscopic data (IR. 'H, 13 C, 31 P NMR).

Open Access June 2, 2014

Synthese und spektroskopische Charakterisierung neuer Mono(cyclopentadienyl)titan(IV)thiolat-Komplexe des Typs CpTi(SR)_n(Cl)_3-n mit n = 1, 2, 3 / Synthesis and Spectroscopic Characterization of New Mono(cyclopentadienyl)titanium(IV) Thiolate Complexes of the Type CpTi(SR)_n(Cl)_3-n n =1,2,3

Thomas Klapötke, Regina Laskowski, Hartmut Köpf

Page range: 777-780

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Abstract

The mono(cyclopentadienyl)titan(IV)thiolat-Komplexe des Typs CpTi(SR)"(Cl) 3 _ n mit n = 1, 2, 3 Synthesis and Spectroscopic Characterization of New Mono(cyclopentadienyl)titanium(IV) Thiolate Complexes of the Type CpTi(SR)"(Cl) 3 _", n =1,2,3 Cyclopentadienyl-dichloro-thiolato-titanium(IV) Complexes, Cyclopentadienyl-chloro-bis(thiolato)-titanium(IV) Complexes, Cyclopentadienyl-tris(thiolato)-titanium(IV) Complexes The mono(cyclopentadienyl)titanium(IV) derivatives CpTi(SR)Cl-> (Cp = ?7 5 -C 5 H 5 ; R = QF S , C 6 H 4 Cl-p, C 6 H 4 Br-p, C6H4CH3-O, C 6 H 4 CH 3 -p, C 6 H", C,H,)\ Cp'Ti(SR)Cl 2 (Cp' = >7 5 -C 5 H 4 CH 3 ; R = C 6 H 5 , C 6 H 4 C1 -p, C 6 H 4 CH 3 -o, C 6 H 4 CH 3 -/>), CpTi(SR) 2 Cl (R = C 6 H 5), Cp'Ti(l,2-S 2 C 6 H 3 CH 3 -4)Cl, and CpTi(SR) 3 (R = C 6 H 5) were prepared by reaction of CpTiCl 3 or Cp'TiCl 3 with equivalent amounts of the appropriate lithium thiolates, or with the free thiol and triethylamine, respectively. The new thiolate complexes were characterized by 'H NMR and mass spectroscopy.

Open Access June 2, 2014

Synthesis of Apocholic Acid Derivatives by Photochemical Rearrangement of 12-Oxo-steroids

Peter E. Hammann, Gerhard G. Habermehl

Page range: 781-782

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Abstract

The photochemical rearrangement of 3α,24-Diacetoxy-5β,14α-cholan-12-one is described.

Open Access June 2, 2014

Indobine — a New Alkaloid from Rauwolfia serpentina Benth

Salimuzzaman Siddiqui, S. Imtiaz Haider, S. Salman Ahmad

Page range: 783-784

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Abstract

Indobine. Rauwolfia serpentina A new alkaloid indobine has been isolated from the roots of Rauwolfia serpentina obtained from Thailand and its structure was determined as benzylester of indole propionic acid through chemical and spectroscopic studies.

Open Access June 2, 2014

Synthesis and Serotonin-Receptor Activity of Substituted 1-Oxo-1,2,3,4-tetrahydro-β-carbolines

Claus Herdeis, Gerhard Bissinger

Page range: 785-790

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Abstract

3-Hydroxy-2-pyridone, Strychnocarpine Derivatives, 5-Hydroxytryptamine Receptor Stimulators 2,3-Dihydroxypyridine is used as a starting material for the synthesis of donor and acceptor substituted l-oxo-l,2,3,4-tetrahydro-/S-carbolines via Fischer indole cyclisation. An alkaloid from Alstonia venenata is prepared. All compounds inclusive strychnocarpine show low affinity to the Serotonine receptor.

Open Access June 2, 2014

Magnetic and Spectroscopic Properties of Metal(II) Thiocyanate Compounds with 3,4-Dialkyl Substituted 1,2,4-TriazoIes

Wim Vreugdenhil, Marcel F. J. Schoondergang

Page range: 791-795

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Abstract

Syntheses, spectroscopic and magnetic properties are described of a series of metal(II) thio-cyanate compounds with the asymmetric ligands 3-methyl-4-ethyl-l,2,4-triazole and 3-methyl-4-;-butyl-l,2,4-triazole. A dinuclear structure is proposed for the manganese, cobalt and nickel compounds based on the magnetic behaviour as well as on spectroscopic and analytical data. These compounds show antiferromagnetic interaction in the temperature range 4—80 K. The zinc compounds appear to be mononuclear, whereas a chain-like structure is proposed for the cad-mium compounds.

Open Access June 2, 2014

Notiz zu einer Reaktion von Alkoholen mit dem phasentransfer-katalytischen Dichlorcarbensystem (Anwendungen der Phasentransfer-Katalyse, Teil 36 [1]) / Notice on a Reaction of Alcohols with the Phase Transfer Catalytic Dichlorocarbene System (Applications of Phase Transfer Catalysis, Part 36 [1])

Eckehard V. Dehmlow, Rainer Neuhaus

Page range: 796-798

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Abstract

1.2-Dialkoxytetrachlorocyclopropanes, ortho Esters Primary aliphatic alcohols and HCCl 3 /NaOH/ catalyst yield stereoisomeric 1,2-dialkoxytetra-chlorocyclopropanes 4 and 5, benzyl and phenethyl alcohol give orthoformates (1). Compounds 4 suffer rearrangement/hydrolysis at 120 °C yielding 3-alkoxv-2,3-dichloroacrylates (6).

Open Access June 2, 2014

Freisetzung von Schwefelmonoxid aus seinen Komplexverbindungen [1] / Liberation of Sulfur Monoxide from its Coordination Compounds [1]

Wolfdieter A. Schenk, Johanna Leißner

Page range: 799-800

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Abstract

The complexes [M(P/Pr 3) 2 (SO)Cl] (M = Rh, Ir) react with CO under mild conditions to give free SO which is trapped by cycloaddition to an ortho-quinone.

Open Access June 2, 2014

Polysulfid-Radikalionen in Aceton / Polysulfide Radical Ions in Acetone

F. Seel, M. Wagner

Page range: 801-801

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Abstract

The formation of sulfur radical ions S 3 ~ and S 4 " in the blue and violet solutions of potassium sulfide and sulfur in acetone on adding 18C6 crown ether has been demonstrated by spectrophotometric titra-tion under anaerobic conditions. Neither the colour nor the spectra of the solutions point at S 2 ~.

About this journal

Objective
Zeitschrift fuer Naturforschung B (ZNB) publishes novel research in all areas of inorganic chemistry, organic chemistry, and analytical chemistry. In particular, the journal focuses on solid state chemistry, coordination chemistry, main group element chemistry, synthetic organic chemistry, natural product chemistry and, to a lesser extent, on analytical chemistry. For more than 65 years Zeitschrift fuer Naturforschung B has been open to contributions from all fields of experimental and theoretical chemistry. Zeitschrift fuer Naturforschung B publishes 12 issues per volume/year. Sometimes double issues occur.

Topics

Solid state chemistry
Coordination chemistry
Main group element chemistry
Organic chemistry
Natural product chemistry

Article formats
Original (full) papers, research notes and preliminary communications, reports on specific research topics of current interest (reviews)

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Volume 42 Issue 6

Issue of Zeitschrift für Naturforschung B

Titelei

Ultramarin-Gelb II: Herstellung und Charakterisierung einer Rarität / Ultramarine-Yellow II: Preparation and Characterization of a Rarity

Abstract

Zum Einbau von einigen Lanthaniden in Gd2Cl3 / Incorporation of Some Lanthanides into Gd2Cl3

Abstract

Zur Charakterisierung zweier polymerer Kohlenstoffselenide / Characterization of Two Polymerie Carbon Selenides

Abstract

(tert-C4H9)3 PTe — ein typisches Tellurophosphoran? [1] / (ferr-C4H9)3 PTe -a Typical Tellurophosphorane? [1]

Abstract

Zur Darstellung und Kristallstruktur PbZn(NCS)4 / Synthesis and Crystal Structure of PbZn(NCS)4

Abstract

Photolyse von elementarem Schwefel (S6 , S7 , S8 , S10 , S12 ) in Kohlenstoffdisulfidlösung [1] / Photolysis of Elemental Sulfur (S6, S7, S8, S10, S12) in Carbondisulfide Solution [1]

Abstract

34S-Isotopenaustausch zwischen flüssigem Kohlenstoffdisulfid und elementarem Schwefel [1] / Sulfur-34 Isotopic Exchange between Liquid Carbondisulfide and Elemental Sulfur [1]

Abstract

Zur Synthese von Tetra-p-tolyldibismutan und dessen Spaltung mit Diphenyldichalkogeniden, elementarem Schwefel, Selen und p-Benzochinon / Synthesis of Tetra-p-tolyldibismuthane and its Cleavage with Diphenyl Dichalcogenides, Elemental Sulfur, Selenium and p-Benzoquinone

Abstract

Trithiadiazyl-hexafluorarsenate S3N2X+AsF6- / Trithiadiazyl-hexafluoroarsenates S3N2X+AsF6-

Abstract

Application of Reverse Two-Dimensional 1H{15N} NMR Spectroscopy to the Characterization of Two Inorganic Compounds:

Abstract

X-Ray Structures of Several Bis(N-alkylsalicylaldiminato)zinc(II) Complexes

Abstract

Bis(acetylen)komplexe des Niobs und Tantals / Bis-acetylene Complexes of Niobium and Tantalum

Abstract

Organoborierung von Alkinylstannanen, XX [1] Oligomerisation von 1-Propinyltrimethylstannan / Organoboration of Alkynylstannanes, XX [1] Oligomerisation of 1-Propynyltrimethylstannane

Abstract

Abstract

The Chemistry of Silica Supported Chromium Ions Nitric Oxide Complexes and their Interaction with CO and Pyridine

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Darstellung, Charakterisierung und Röntgenstrukturanalyse von η5 -Pentamethylcyclopentadienyl-bis(methylsulfido)carbonylrhenium, Cp*Re(CO)(SMe)2 / Preparation, Characterization and X-Ray Structure Analysis of η5-Pentamethylcyclopentadienyl-bis(methylsulfido)carbonylrhenium, Cp*Re(CO)(SMe)2

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The Defect Structure of CdO

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Beiträge zur Chemie der Schwefel-Halogenide, 17 [1] Dimethyl(methylthio)-und Dimethyl(phenylthio)sulfonium-Salze / Contributions to the Chemistry of Sulfur Halides, 17 [1] Dimethyl(methylthio)-and Dimethyl(phenylthio)sulfonium Salts

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Über die Photolumineszenz von Oberflächenverbindungen des Molybdäns auf Silicagel / On the Photoluminescence of Molybdenum Surface Compounds on Silicagel Supports

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Über die Reaktion von Chromocen mit einem Co/Kieselgel-Träger / On the Reaction of Chromocene with a Co/Silica Gel Support

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Übergangsmetall-substituierte Diphosphene, VI [1]Zur Reaktivität von Diphosphenylkomplexen des Eisens und Rutheniums gegenüber Tetracarbonylnickel / Transition Metal Substituted Diphosphenes, VI [1] On the Reactivity of Diphosphenyl Complexes of Iron and Ruthenium towards Tetracarbonyl Nickel

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Synthese und spektroskopische Charakterisierung neuer Mono(cyclopentadienyl)titan(IV)thiolat-Komplexe des Typs CpTi(SR)n(Cl)3-n mit n = 1, 2, 3 / Synthesis and Spectroscopic Characterization of New Mono(cyclopentadienyl)titanium(IV) Thiolate Complexes of the Type CpTi(SR)n(Cl)3-n n =1,2,3

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Synthesis of Apocholic Acid Derivatives by Photochemical Rearrangement of 12-Oxo-steroids

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Indobine — a New Alkaloid from Rauwolfia serpentina Benth

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Synthesis and Serotonin-Receptor Activity of Substituted 1-Oxo-1,2,3,4-tetrahydro-β-carbolines

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Magnetic and Spectroscopic Properties of Metal(II) Thiocyanate Compounds with 3,4-Dialkyl Substituted 1,2,4-TriazoIes

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Notiz zu einer Reaktion von Alkoholen mit dem phasentransfer-katalytischen Dichlorcarbensystem (Anwendungen der Phasentransfer-Katalyse, Teil 36 [1]) / Notice on a Reaction of Alcohols with the Phase Transfer Catalytic Dichlorocarbene System (Applications of Phase Transfer Catalysis, Part 36 [1])

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Freisetzung von Schwefelmonoxid aus seinen Komplexverbindungen [1] / Liberation of Sulfur Monoxide from its Coordination Compounds [1]

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Polysulfid-Radikalionen in Aceton / Polysulfide Radical Ions in Acetone

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Zum Einbau von einigen Lanthaniden in Gd₂Cl₃ / Incorporation of Some Lanthanides into Gd₂Cl₃

(tert-C₄H₉)₃ PTe — ein typisches Tellurophosphoran? [1] / (ferr-C₄H₉)₃ PTe -a Typical Tellurophosphorane? [1]

Zur Darstellung und Kristallstruktur PbZn(NCS)₄ / Synthesis and Crystal Structure of PbZn(NCS)₄

Photolyse von elementarem Schwefel (S₆ , S₇ , S₈ , S₁₀ , S₁₂ ) in Kohlenstoffdisulfidlösung [1] / Photolysis of Elemental Sulfur (S₆, S₇, S₈, S₁₀, S₁₂) in Carbondisulfide Solution [1]

³⁴S-Isotopenaustausch zwischen flüssigem Kohlenstoffdisulfid und elementarem Schwefel [1] / Sulfur-³⁴ Isotopic Exchange between Liquid Carbondisulfide and Elemental Sulfur [1]

Trithiadiazyl-hexafluorarsenate S₃N₂X⁺AsF₆^- / Trithiadiazyl-hexafluoroarsenates S₃N₂X⁺AsF₆^-

Application of Reverse Two-Dimensional ¹H{¹⁵N} NMR Spectroscopy to the Characterization of Two Inorganic Compounds:

Darstellung, Charakterisierung und Röntgenstrukturanalyse von η⁵ -Pentamethylcyclopentadienyl-bis(methylsulfido)carbonylrhenium, CpRe(CO)(SMe)₂ / Preparation, Characterization and X-Ray Structure Analysis of η⁵-Pentamethylcyclopentadienyl-bis(methylsulfido)carbonylrhenium, CpRe(CO)(SMe)₂

Synthese und spektroskopische Charakterisierung neuer Mono(cyclopentadienyl)titan(IV)thiolat-Komplexe des Typs CpTi(SR)_n(Cl)_3-n mit n = 1, 2, 3 / Synthesis and Spectroscopic Characterization of New Mono(cyclopentadienyl)titanium(IV) Thiolate Complexes of the Type CpTi(SR)_n(Cl)_3-n n =1,2,3