Published by De Gruyter

Volume 42 Issue 7

Issue of Zeitschrift für Naturforschung B

Contents
Journal Overview

Open Access June 2, 2014

Darstellung und Kristallstrukturen von [Co₆Se₈(PPh₃)₆]⁺[CoCl₃(THF)]^- , [Co₈Se₈(PPh₃)₆][Co₆Se₈(PPh₃)₆] und [Co₈Se₈(PPh₃)₆]⁺[CoCl₃(PPh₃)]^-

Dieter Fenske, Johannes Ohmer, Kurt Merzweiler

Page range: 803-809

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Abstract

(NBu 4 )[CoCl 3 (PPh 3 )] reacts with Se(SiMe 3 ) 2 to form the new clusters [Co 8 Se 8 (PPh 3 ) 6 ][CoCl 3 (PPh 3 )] (6) and [Co 8 Se 8 (PPh 3 ) 6 ][Co 6 Se 8 (PPh 3 ) 6 ] (7). The structures of 6 and 7 have been determ ined by X-ray diffraction. 6 and 7 crystallize in the space group P1̄ with two formula units per unit cell and with the following lattice constants at 180 K: 6: a = 1413.8(10), b - 2224.2(23), c = 2348.4(17) pm, α = 86.06(5), β = 86.58(5), γ = 76.11(5)°; 7: a = 1465.9(4), b = 1627.6(6), c = 2505.7(6) pm, α - 98.69(2), β = 96.23(2), γ = 113.06(2)°. The cluster structures of the [Co 8 Se 8 (PPh 3 ) 6 ] n (n = 0, 1 +) depend on the total number of electrons in the cluster units.

Open Access June 2, 2014

Darstellung von monomerem Methylenaminoacetonitril H₂C = N —CH₂—CN in der Gasphase [1]

Ralph Dammel, Hans Bock

Page range: 810-814

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Abstract

The reactive intermediate methyleneaminoacetonitrile H 2 C = N - C H 2 - CN has been generated via thermal retrotrimerization of N ,N',N"-tris(cyanomethyl)hexahydro-s-triazine and characterized by its photoelectron, mass and low-temperature NMR spectra. A fully geometryoptimized MNDO calculation allows to assign the observed ionization energies and yields estimates for other molecular properties, e.g. a rather high dipole moment.

Open Access June 2, 2014

Synthese und Struktur von Phenyltetra(acetato)stiboran

Markus Wieber, Isa Fetzer-Kremling, Hildegard Reith, Christian Burschka

Page range: 815-817

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Abstract

Phenyltetra(acetato)stiborane is obtained by reacting phenyldichlorostibane successively with sulfuryl chloride and silver acetate at low temperatures ( - 70 °C). An X-ray analysis of C 6 H 5 Sb[OC(O)CH 3 ] 4 shows, that the central antimony atom is hexacoordinated by chelation of one nearly symmetrically bonded acetate group, a phenyl group, and three singly-bonded acetate ligands.

Open Access June 2, 2014

Polymorphie von Cs₃Tl₂Br₉

Klaus Zimmermann, Gerhard Thiele

Page range: 818-824

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Abstract

Cs 3 Tl 2 Br 9 , which has been synthesized either by heating a 3:2 mixture of CsBr/TlBr with bromine in a closed system or by reaction of these components in aqueous solutions, shows dimorphism. The phase transition (170 °C) was characterized by thermal analysis and X-ray diffraction. The low temperature modification α-Cs 3 TlBr 9 crystallizes in the monoclinic space group P2 1 /m (a = 964.98(9), b = 779.49(7), c = 1382.16(13) pm, β = 92.68(1)°, Z = 2). The structure is built up from TlBr 6 octahedra linked by sharing vertices to chains and isolated TlBr 4 tetrahedra. The high tem perature modification β-Cs 3 Tl 2 Br 9 represents the undistorted trigonal Cs 3 Bi 2 Br 9 -type structure (a = 796.80(8), c - 982.98(15) pm).

Open Access June 2, 2014

Darstellung und Kristallstrukturen von Ca₄In₂N und Sr₄In₂N

Gerhard Cordier, Stephan Rönninger

Page range: 825-827

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Abstract

The new compounds Ca 4 In 2 N and Sr 4 In 2 N crystallize in the tetragonal system (space group I4 1 /amd, No. 141). In and Ca together form a rocksalt structure. All octahedral holes, which are built by Ca only, are occupied by nitrogen. The In atoms form In-In zig-zag-chains; the In-In bond lengths are 316.4 pm (Ca compound) and 332.0 pm (Sr compound), resp.

Open Access June 2, 2014

Schwermetall-π-Komplexe II [1] Arenkomplexe des Quecksilbers(I)

W. Frank, B. Dincher

Page range: 828-834

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Abstract

The crystalline compounds [(CH 3 C 6 H 5 ) 2 Hg,][AlCl 4 ] 2 (1), [(1,2-(CH 3 ) 2 C 6 H 4 ) 2 Hg 2 ][AlCl 4 ] 2 (2), [(1,3,5-(CH 3 ) 3 C 6 H 3 ) 2 Hg 2 ][AlCl 4 ] 2 (3), [1,2,4,5-(CH 3 ) 4 C 6 H 2 Hg 2 ][AlCl 4 ] 2 (4) and [((CH 3 ) 6 C 6 ) 2 Hg 2 ][AlCl 4 ] 2 -CH 3 C 6 H 5 (5) have been prepared from mercury(I)chloride, aluminium trichloride and the corresponding arenes and characterized by elem ental analysis. The crystal structure of 5 has been determ ined from single crystal X-ray diffraction data and refined to R - 0.093 for 3269 unique reflections. Crystal data: monoclinic, space group P2 1 /c, a = 2116(1), b = 1095.1(7), c = 1880(1) pm, β - 104,9(1)°, Z = 4. Each atom of a central Hg 2 unit (Hg -Hg distance 251.5 pm) is asymmetrically complexed by hexamethylbenzene, the Hg - C arene distances being in the range from 241 to 340 pm. Two distorted AlCl 4 tetrahedra complete a “molecular” [arene 2 Hg 2 ][AlCl 4 ] 2 unit. The shortest Hg-Cl distances are 310 and 312 pm, respectively.

Open Access June 2, 2014

Charge Transfer in MX₃ • CH₃CN (M = Al, Ga; X = Br, I) by Means of ¹⁴N, ²⁷Al, ⁶⁹Ga, ⁸¹Br, and ¹²⁷I NQR

Tsutomu Okuda, Koji Yamada, Hideta Ishihara, Sumio Ichiba

Page range: 835-838

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Abstract

NQR spectra were observed in the 1:1 complexes of CH 3 CN with AlBr 3 , AlI 3 , and GaBr 3 . The NQR data suggest that these complexes consist of the molecular species MX 3 · CH 3 CN. The electron populations on the resonant nuclei and the charge transfer between N and metal atoms were estimated according to the Townes-Dailey treatment. The results show that the amount of the charge transfer in these complexes is large.

Open Access June 2, 2014

Die Struktur von Undecacarbonyl-(μ-trifluormethylisocyanid)trieisen Fe₃(μ-CNCF₃)(CO)₁₁ in Lösung

Dieter Lentz

Page range: 839-842

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Abstract

According to its 13 C NMR spectra, undecacarbonyl-(μ-trifluorom ethylisocyanide)triiron, Fe 3 (μ-CNCF 3 )(CO) 11 , is only partly nonrigid in solution even at ambient temperature. However, on cooling to -100 °C the molecule is rigid on the NMR time scale.

Open Access June 2, 2014

The Vibrational Spectra of NH₄VO₃ at Elevated Temperatures and Pressures

A . M. Heyns, M. W. Venter, K.-J. Range

Page range: 843-852

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Abstract

Results obtained from the vibrational spectra of NH 4 VO 3 and its deuterated analogues show that at least two types of hydrogen bond interactions can be identified at am bient conditions. In accordance with the structural data on NH 4 VO 3 (F. C. Hawthorne and C. Calvo, J. Solid State Chem. 22, 157 (1977)) these interactions are assigned to normal, strong hydrogen bonds and weaker bifurcated ones, respectively. The temperature dependence of some of the N -H bands indicates that the normal hydrogen bonds decrease in strength with increasing temperatures, while the bifurcated ones tend to increase in strength. The NH 4 + ions do not show fluxional behaviour at ambient conditions and even the bifurcated hydrogen bonds are of the type that is dominated by acceptor strength of the anions and not by a volume effect. The Ram an active NH 4 + vibrations are very weak compared to the V - O modes and could not all be observed in the highpressure diamond anvil cell. The temperature dependence of the V - O Ram an active modes suggests that changes in the crystals of NH 4 VO 3 brought about by the application of heat mainly involve the O -V -O angles, while pressure changes are mostly accommodated by changes in the V -O bridging bonds and O -V -O bridging angles.

Open Access June 2, 2014

Metallorganische Reaktionen konjugierter Azomethine, IV [1] Katalytische Synthese substituierter Cyclohexane aus Butadien und 1-Azadienen an π-Allyl-Palladium-Komplexen

Heindirk tom Dieck, Christiane Müller, Erhard T.K. Haupt, Dörte Bolze-Kuhrt

Page range: 853-859

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Abstract

The reaction of dimeric π-allyl palladium chloride with 1-azadienes 1 ( R -N = CH-CH = CH-R') affords the mononuclear complexes (π-Allyl)Pd(L)Cl 2. Two independent intramolecular rotational motions are detected by NMR methods. These complexes (with R ' = Aryl) react with silver tetrafluoroborate, preferentially in the presence of 1, to the cationic complexes [(π-Allyl)Pd(L) 2 ] + BF 4 - , 3, which are also non-rigid with respect to ligand rotation on the NMR time scale. Complexes 3 catalyse the 2 :1-cyclo-cooligomerization of butadiene and 1-azadienes. This reaction to compounds 4 constitutes the first example of a very regio- and stereoselective formation of cyclohexanes from three C = C double bonds. The structure, substitution pattern and conformation of 4 are assigned on the basis of 2D -correlation NMR spectroscopy.

Open Access June 2, 2014

Phosphinsubstituierte Chelatliganden, XXV [1] Diastereoselektive Komplexierung chiraler Phosphinothioformamide mit entferntem Asymmetriezentrum

Udo Kunze, Roland Burghardt

Page range: 860-866

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Abstract

For further studies of the diastereoselective complex formation of ambidentate chiral chelating ligands, we prepared the racemic phosphinothioformamides. Ph 2 P(X )C(S)NHC*HR 1 R 2 , with X = 2e - (R 1 = Ph,R 2 = Et: 1a;R 1 = Ph,R 2 = iPr:2a; R 2 = Me,R 2 = Et:3a) and X = O (1b ,2b ) according to a previously reported route. The coordination of 1a -3a to CpM (CO) 3 Cl (M = Mo, W) in m ethanol gives the diastereomeric P.S-chelate complexes, (Mo: 4-6, W: 7-9). In solution, epimerisation proceeds to an equilibrium ratio of B/A = 1,5 in case of 4, 5, 7, and 8, but less than 1,1 with 6 and 9. A reduced diastereoselectivity (d.e. 10 -20%) is also observed during the formation of the analogous molybdenum complexes 10a-d with phosphine ligands derived from α-amino acid esters. Ph 2 PC(S)NHC*H(R)COOMe [R = Me (L-Ala), CH 2 Ph (L-Phe). CHMe 2 (L-Val). Ph (D-phenylglycine)]. The results indicate a significant asymmetric induction despite of the four bond distance of the chiral centres.

Open Access June 2, 2014

Komplexe offenkettiger und zyklischer Diazathiaalkane. Die Kristallstrukturen von 1,7-Diaza-4-thiaheptan-tricarbonyl-molybdän(0), 1-Thia-4,7-diazacycIononan-tricarbonyI-molybdän(0) und 1-Thia-4,7-diazacyclononan-tricarbonyl-rhenium(I)-bromid

Peter Hoffmann, Andreas Steinhoff, Rainer Mattes

Page range: 867-873

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Abstract

The reactions of Mo(CO) 6 , W(CO) 6 and Re(CO) 6 Br with the ligand l-thia-4,7-diazacyclononane (C 6 H 14 N 2 S = L) yield crystals of LMo(CO) 3 (4a), LW(CO) 3 (4b) and LRe(CO) 3 Br (5). A n improved synthesis of L has been developed, and the structures of 4a and 5 have been determined. Crystal data: 4a, monoclinic, space group P2 1 /n, a = 791.3(4), b - 1332.6(4), c = 1149.2(6) pm, β - 98.96(4)°, Z = 4.1841 reflexions, R = 0.045. 5, orthorhombic, space group Pbca, a = 1413.4(5), b = 1398.0(5), c = 1409.5(5) pm, Z = 8.2619 reflexions, R = 0.038. Both crystals contain pseudooctahedral LM(CO) 3 moieties, with facial coordination of the CO molecules. The Re - N bond lengths (average 220.3(4) pm) are rather short. The structure of L 'Mo(CO) 3 (3) with the acyclic ligand 1,7-diaza-4-thiaheptane (C 4 H 10 N 2 S = L') was also determined. Crystal data: monoclinic, space group P2 1 /c, a = 682.8(2), b = 1213.0(3), c = 1253.0(3), β = 99.74°, Z = 4.1889 reflexions, R = 0.023.

Open Access June 2, 2014

Reaktionen von Übergangsmetallhalogemden mit N-Trimethylsilylhexafluorisopropylidenimin und Lithiumhexafluorisopropylidenimid

Herbert W. Roesky, Frank Schrumpf, Frank Edelmann

Page range: 874-876

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Abstract

WF 6 and Me 3 SiN = C(CF 3 ) 2 (1) react to give the black-red crystalline FW [N = C(CF 3 ) 2 ] 5 (3). Ti[N = C(CF 3 ) 2 ] 4 • 2THF (4) has been obtained by the rection of LiN = C(CF 3 ) 2 (2) and TiCl 4 in THF. 3 and 4 are sublimeable solids. They have been characterized by mass and NMR spectra as well as by elemental analysis.

Open Access June 2, 2014

Der elektronisch stabilisierende Beitrag des Ph₃P=N-Liganden. Darstellung von CH₃WCl₄N =PPh₃ und das elektrochemische Verhalten von Ph₃PN-substituierten Wolfram(VI)-Halogeniden

Herbert W. Roesky, Tetsuro Tojo, Michaela Ilemann, Dieter Westhoff

Page range: 877-880

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Abstract

The reaction of CH 3 WCl 5 and Me 3 SiN = PPh 3 yields CH- 3 WCl 4 N = PPh 3 (1). The electrochem ical reduction of 1, F 5 WN = PPh 3 (2) and F 4 W (N = PPh 3 ) 2 (3) has been investigated using cyclic voltammetry and potentiostatic methods. The cyclic voltammogram of 1 shows two reduction waves at E f + 1.72 and 0.420 V. The controlled potential reduction of 1 indicates two steps of reversible one-electron charge transfers. The cyclic voltammograms of 2 and 3 in CH 2 Cl 2 show reversible one-electron waves at E f -0.45 and -1.45 V, respectively. The reduced products were analyzed by 19 F and 31 P NMR spectroscopy.

Open Access June 2, 2014

tert-Butylimino-cyclopentadienyIvanadiuni(V)-Verbindungen Darstellung, Struktur und NMR-spektroskopische Untersuchungen

Fritz Preuss, Harald Becker, Hans-Joachim Häusler

Page range: 881-888

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Abstract

The cyclopentadienyl compounds t C 4 R 9 N = VCpCl 2 (2). t C 4 H 9 N = VCp(O t C 4 H 9 )Cl, t C 4 H 9 N = VCp(O t C 4 H 9 )(R) (R = CH 3 , "C 4 H 9 , CH 2 SiMe 3 ), t C 4 H 9 N = VCp 2 (O t C 4 H 9 ) (5) and , t C 4 H 9 N = VCp(O t C 4 H 9 ) 2 have been prepared starting from t C 4 H 9 N = VCl 3 1 H and 51 V NMR spectra are discussed; except for 5, the C 5 H 5 rings are η 5 -coordinated to the metal atom. The temperature dependence of the 1 H NMR spectrum of 5 indicates two types o f intramolecular rearrangements: η 1 /η 5 -Interchange of the C 5 H 5 rings and fluxional behavior of the η 1 -C 5 H 5 ring. The molecular structure of 2 has been investigated by X-ray diffraction analysis.

Open Access June 2, 2014

Computerunterstützte mechanistische Analyse der Streith-Reaktion mit dem Programm RAIN

Eric Fontain, Johannes Bauer, Ivar Ugi

Page range: 889-891

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Abstract

An improved version of the computer program RAIN (for bilaterally generating Reaction And Intermediate Networks from educts and products; FORTRAN 77, MS-DOS) is presented. Its application is illustrated by the elaboration of a network of mechanistic pathways for the Streith reaction.

Open Access June 2, 2014

Übergangsmetallkomplexe instabiler Ylide, X [1] Chemische und elektrochemische Untersuchungen zu den Redox-Eigenschaften cyclischer Tetracarbonylchrom-Ylidchelatkomplexe / Transition Metal Complexes of Unstable Ylides, X [1] Chemical and Electrochemical Investigations of the Redox Properties of Cyclic Tetracarbonylchromium-Ylide-Chelate-Complexes

Lothar Weber, Ewald Lücke, Ulrich Kölle, S. Ohst

Page range: 892-896

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Abstract

Treatment of the ylide chelate complexes (CO) 4 (1) with (C 5 H 5 ) 2 Fe + PF 6 - leads to the organometallic radical cations 2. The oxidation process of 1 is also checked electrochemically by means of cyclovoltammetry, which exhibits a reversibel one electron oxidation between -0.1 and +0.3 V vs. SCE. These potentials are more negative than in any other complex of the general type Cr(CO) 4 L 2 (L e.g. = PR 3 , CNR).

Open Access June 2, 2014

Studies on Wasp Venom, II A New Mast Cell Degranulating Peptide from the Wasp Paravespula vulgaris

Uwe Schulze, Klaus-Dieter Schrader, Robert Chen, Lutz Grotjahn, Wilfried A. König

Page range: 897-902

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Abstract

From the extract of 3991 venom glands of the most common European wasp species Paravespula vulgaris a novel basic pentadecapeptide was isolated and investigated by amino acid analysis, micro-Edman-degradation and fast atom bombardment mass spectrometry. The peptide has the sequence H-Ile-Asn-Trp-Lys-Lys-Ile-Lys-Ser-Ile -lle -Lys-Ala-Ala-Met-Asn and exhibits strong mast cell degranulating activity similarly to the mastoparans isolated from various wasp species.

Open Access June 2, 2014

Zur Azulen-Azulen-Umlagerung des 1-Phenylazulens

Arthur Wetzel, Klaus-Peter Zeller

Page range: 903-906

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Abstract

1-Phenyl-[3- 13 C]- (8) and 1-phenyl-[4- 13 C]azulene (19) are prepared using ethyl [2- 13 C]acetate and [formyl- 13 C]dimethylformamide as 13 C-sources. The thermal azulene-azulene rearrangement of 8 and 19 yields 2-phenyl-[3a- 13 C]azulene and 2-phenyl-[4- 13 C]azulene, respectively. In com bination with earlier results it is concluded that in the skeletal rearrangement the carbon atoms of the five-m em bered ring are shifted by one position, whereas the carbon atoms C-4-C-8 of the seven-membered ring remain at their original position.

Open Access June 2, 2014

Photochemistry of Pesticides, 10 [1] Photodegradation of O,O-Diethyl-S(3,4-dihydro-4-oxobenzo[d][1,2,3]triazin- 3-yl-methyl)phosphorodithioate (Azinphos-ethyl)

W. M. Abdou, M. M. Sidky, H. Wamhoff

Page range: 907-910

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Abstract

The photodegradation of Azinphos-ethyl (1) in chloroform and methanol solution has been studied. 3,4-Dihydro-3-methyl-4-oxobenzo[d][1,2,3]triazine (3), 3,4-dihydro-4-oxo-benzo[d]- [1,2,3]triazine (5), O,O-diethyl-O(3-methylbenzo[d][1,2,3]triazine-4-yl)p hosph ate (8), N-methylanthranilic acid (11) (in methanol: methyl ester 12), and sulfur have been isolated and characterized as photoproducts. The decay mechanism is discussed.

Open Access June 2, 2014

Synthese und Eigenschaften von Pentaazadienido-Komplexen des zweiwertigen Cobalts. Kristallstruktur von [Co(OCH₃)(tolNNNNNtol)]₆ · 2C₉H₁₂

Raimund Schmid, Johannes Beck, Joachim Strähle

Page range: 911-916

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Abstract

Co(tolNNNNNtol) 2 (1) is obtained from solutions of 1,5-di-p-tolyl-1,4-pentaazadiene und CoCl 2 - 6H 2 O in aqueous ammonia. It is a paramagnetic, explosive, red com pound which reacts with alcohols to the alcoholates Co(OR)(tolNNNNNtol). The methoxy complex is hexameric. It crystallizes from mesitylene/methanol as [Co(OCH 3 )(tolNNNNNtol)] 6 · 2C 9 H 12 in the triclinic space group P1̄ with the lattice constants: a = 1667.1(5), b - 1784.2(5), c = 2159.2(6) pm, α = 93.05(3)°, β = 96.10(2)°, γ = 64.63(2)°, Z = 2. In the hexameric complex six Co atoms and six methoxy groups form a central twelve membered Co - O ring with a symmetry close to D 3d . The pentaazadienide ligands act as additional bridges between two Co atoms, coordinating one Co atom monodentate with N1 and the other Co atom bidentate with N3 and N5. This leads to alternating tetrahedral and octahedral coordination of the Co atoms. The average Co-O distances are 192,3 pm in the CoO 2 N 2 tetrahedron and 198,0 pm in the CoO 2 N 4 octahedron. The corresponding Co-N distances are 206.3 and 221.4 pm respectively. In the planar N5 zigzag chain slightly elongated double bonds N1 - N2 and N4 -N5 of 128.2 pm and partial double bonds N2 -N3 and N3 -N4 of approximately 134.6 pm are observed.

Open Access June 2, 2014

Crystallographic Studies and Physicochemical Properties of π-Electron Systems, Part 7 Refinement of the Crystal and Molecular Structure of p-N,N-Dimethylaminobenzoic Acid, Full ab initio STO-3G Optimization of its Molecular Geometry, and Empirical Analysis of Substituent Effects on the Geometry of Benzene Rings in p-Substituted Benzoic Acids

R. Anulewicz, G. Häfelinger, T. M. Krygowski, C. Regelmann, G. Ritter

Page range: 917-927

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Abstract

The crystal and molecular structure of N,N -dimethylaminobenzoic acid (DABA ) was redetermined by means of X-ray diffraction. Crystal data are: M r = 165.2, triclinic, P1̄, a = 6.651(2) Å , b = 8.045(2) Å , c = 8.609(2) Å , α - 88.97(3)°, β = 94.72(3)°, γ = 113.76(3)°, V = 420.13 Å 3 , Z = 2, D m = 1.28 g cm -1 , D x = 1.306 g cm -1 ; CuKα: λ = 1.54178 Å, μ = 6.74 cm -1 , F (000) = 176.00, T - 293 K; R = 0.0684, R w = 0.0780 for 1185 observed reflections. The DABA molecules are almost planar and form cyclic dimers exhibiting no orientational disorder with separation of oxygen atoms R O...O - 2.627(2) Å . The pattern of molecular geometry in DABA suggests a relatively strong through-resonance effect between the NMe2 and COOH groups and shows non-additivity of substituent effects on valence angles and bond lengths in the ring. Mesomeric equalization of CO bond lengths in the carboxylic groups of 10 well solved p-substituted benzoic acids is found to depend linearly on the R O...O distance in H-bridged dimers. Full abinitio STO -3G optimizations of molecular geometries for monomers of DABA , p-aminobenzoic acid, benzoic acid, and formic acid as well as for aniline and N,N -dimethylaniline show resonable agreement with experimental data. Changes of molecular geometries on formation of planar H-bridged dimers have been obtained from calculations for benzoic acid dimers, benzoic - formic acid complex, and formic acid dimers. The latter was also optimized using the 6 -31 G basis set.

Open Access June 2, 2014

Zur Reaktion von (η⁵-C₅H₅)Fe(CO)₂Br mit Se(SiMe₃)₂ Die Kristallstruktur von [Se{Fe(CO)₂(C₅H₅)}₃]₂[Fe₄Se₄Br₄]

Dieter Fenske, Paul Maué, Kurt Merzweiler

Page range: 928-930

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Abstract

(η 5 -C 5 H 5 )Fe(CO) 2 Br reacts with Se(SiMe 3 ) 2 to form the title compound 1, which has been characterized by X-ray crystal structural analysis. 1 crystallizes in the space group P2 1 2 1 2 1 with 4 formula units per unit cell. 1 consists of [Se{Fe(CO) 2 (C 5 H 5 )} 3 ]+- cations and [Fe 4 Se 4 Br 4 ] 2- -anions, the latter with a heterocubane structure.

Open Access June 2, 2014

Die Kristallstruktur von Bis(η-cyclopentadienyl)titana(Ti,^IV)- cyclohexaselenan, Cp₂TiSe₅

Dieter Fenske, Jörg Adel, Kurt Dehnicke

Page range: 931-933

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Abstract

Cp 2 TiSe 5 has been prepared by the reaction of trim ethyltetradecylammonium-polyselenide with Cp 2 TiCl 2 in ethanol solution and subsequent extraction of the dry residue with dichloromethane. Cp 2 TiSe 5 crystallizes in the space group P1 with two formula units in the unit cell (2559 observed, independent reflexions, R = 0.074). The cell dimensions are a = 808.6, b = 822.6, c = 1190.7 pm, α - 96.28°, β - 106.06°, γ = 108.78°. The structure consists of discrete Cp 2 TiSe 5 molecules with the TiSe 5 , ring in the chair conformation.

Open Access June 2, 2014

Herbicides Affecting Chloroplast Functions

Page range: 934-934

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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 7

Issue of Zeitschrift für Naturforschung B

Darstellung und Kristallstrukturen von [Co6Se8(PPh3)6]+[CoCl3(THF)]- , [Co8Se8(PPh3)6][Co6Se8(PPh3)6] und [Co8Se8(PPh3)6]+[CoCl3(PPh3)]-

Abstract

Darstellung von monomerem Methylenaminoacetonitril H2C = N —CH2—CN in der Gasphase [1]

Abstract

Synthese und Struktur von Phenyltetra(acetato)stiboran

Abstract

Polymorphie von Cs3Tl2Br9

Abstract

Darstellung und Kristallstrukturen von Ca4In2N und Sr4In2N

Abstract

Schwermetall-π-Komplexe II [1] Arenkomplexe des Quecksilbers(I)

Abstract

Charge Transfer in MX3 • CH3CN (M = Al, Ga; X = Br, I) by Means of 14N, 27Al, 69Ga, 81Br, and 127I NQR

Abstract

Die Struktur von Undecacarbonyl-(μ-trifluormethylisocyanid)trieisen Fe3(μ-CNCF3)(CO)11 in Lösung

Abstract

The Vibrational Spectra of NH4VO3 at Elevated Temperatures and Pressures

Abstract

Metallorganische Reaktionen konjugierter Azomethine, IV [1] Katalytische Synthese substituierter Cyclohexane aus Butadien und 1-Azadienen an π-Allyl-Palladium-Komplexen

Abstract

Phosphinsubstituierte Chelatliganden, XXV [1] Diastereoselektive Komplexierung chiraler Phosphinothioformamide mit entferntem Asymmetriezentrum

Abstract

Komplexe offenkettiger und zyklischer Diazathiaalkane. Die Kristallstrukturen von 1,7-Diaza-4-thiaheptan-tricarbonyl-molybdän(0), 1-Thia-4,7-diazacycIononan-tricarbonyI-molybdän(0) und 1-Thia-4,7-diazacyclononan-tricarbonyl-rhenium(I)-bromid

Abstract

Reaktionen von Übergangsmetallhalogemden mit N-Trimethylsilylhexafluorisopropylidenimin und Lithiumhexafluorisopropylidenimid

Abstract

Der elektronisch stabilisierende Beitrag des Ph3P=N-Liganden. Darstellung von CH3WCl4N =PPh3 und das elektrochemische Verhalten von Ph3PN-substituierten Wolfram(VI)-Halogeniden

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Der elektronisch stabilisierende Beitrag des Ph₃P=N-Liganden. Darstellung von CH₃WCl₄N =PPh₃ und das elektrochemische Verhalten von Ph₃PN-substituierten Wolfram(VI)-Halogeniden

Synthese und Eigenschaften von Pentaazadienido-Komplexen des zweiwertigen Cobalts. Kristallstruktur von [Co(OCH₃)(tolNNNNNtol)]₆ · 2C₉H₁₂

Zur Reaktion von (η⁵-C₅H₅)Fe(CO)₂Br mit Se(SiMe₃)₂ Die Kristallstruktur von [Se{Fe(CO)₂(C₅H₅)}₃]₂[Fe₄Se₄Br₄]

Die Kristallstruktur von Bis(η-cyclopentadienyl)titana(Ti,^IV)- cyclohexaselenan, Cp₂TiSe₅