Published by De Gruyter

Volume 58 Issue 5

Issue of Zeitschrift für Naturforschung B

Contents
Journal Overview

June 2, 2014

Organoaluminium and -Gallium Compounds with O-Oximato Substituents

Norbert W. Mitzel, Christian Lustig, Markus Woski

Page range: 363-368

Abstract

The organoaluminium and -gallium acetonoximates (tBu 2 MON=CMe 2 ) 2 (M = Al, Ga) have been prepared by the reaction of acetoneoxime with tri-tert-butylaluminium and -gallium. The compounds (Me 2 MON=CMe 2 ) 2 (M = Al, Ga), described previously, were synthesized for comparison. All compounds have been characterised by NMR spectroscopy ( 1 H, 13 C, 27 Al), by mass spectrometry and elemental analyses. The crystal structures of the four compounds have been determined, and it was shown that all form dimers with six-membered M 2 O 2 N 2 rings by aggregation through the imino N atoms. The compounds (Me 2 MON= CMe 2 ) 2 adopt boat conformations, whereas the compounds (tBu 2 MON=CMe 2 ) 2 prefer chair conformations. Large differences in the M-O-N angles have been found between the methyl and the tert-butyl analogues.

June 2, 2014

Three-Membered Ring Formation by Si···N Interactions in Aminosulfenylsilanes

Norbert W. Mitzel

Page range: 369-374

Abstract

The reaction of dimethylaminosulfenylchloride Me 2 NSCl with trichlorosilane HSiCl 3 and triethylamine gives elemental sulphur and Me 2 NSiCl 3 . The aminosulfenylsilane Me 2 NSSiCl 3 is postulated to be an intermediate of this reaction. Ab initio calculations (MP2/6D311G(d,p)) on Me 2 N-S-SiH 3 , Me 2 N-S-SiH 2 Cl, Me 2 N-S-SiH 2 F, and Me 2 N-S-SiCl 3 have been carried out, demonstrating the occurrence of acute valence angles at sulphur and short Si···N distances, which are indicative of NSSi three-membered rings. The strength of the Si · · · N interactions depends on the electronegativity of the substituent at silicon in anti-position to the nitrogen atom and is strongest in the anti conformer of Me 2 N-S-SiH 2 F (< NSSi 68°, Si···N 2.208 Å ). The coordination spheres of the nitrogen atoms in the Me 2 N-S-SiR 3 molecules are steeply pyramidal, which is in contrast to the planarised N atoms in other SNMe 2 compounds, such as Me 2 NSCl. The crystal structure of this compound has been determined, as well as that of the product of the above reaction, Me 2 NSiCl 3 . Both have planar coordination geometries at the nitrogen atoms.

June 2, 2014

Einkristalle des Neodym(III)-meta-Borats Nd(BO₂)₃ und -ortho-Borats Nd[BO₃]/Single Crystals of the Neodymium(III) meta-Borate Nd(BO₂)₃ and ortho-Borate Nd[BO₃]

Helge Müller-Bunz, Tanja Nikelski, Thomas Schleid

Page range: 375-380

Abstract

Pale violet, transparent, air- and water-resistant single crystals of the neodymium oxoborates Nd[BO 3 ] and Nd(BO 2 ) 3 emerged from reactions of Nd 2 O 3 , NdF 3 or NdCl 3 , and B 2 O 3 in variable molar ratios during attempts to synthesize neodymium halide borates (e. g. Nd 2 F 3 [BO 3 ] or NdCl(BO 2 ) 2 ). The preparations were carried out at 700 °C in sealed tantalum capsules using CsCl as a flux, or at 850 °C in evacuated silica ampoules with an excess of NdCl 3 as fluxing agent. Neodymium ortho-borate λ -Nd[BO 3 ] (orthorhombic, Pnma; a = 573.51(5), b = 505.64(4), c = 809.16(7) pm; Z = 4) is isotypic with aragonite-type CaCO 3 containing quasi-planar, discrete [BO 3 ] 3 − triangles (d(B-O) = 138 pm, 3×) and Nd 3+ in ninefold oxygen coordination (d(Nd-O) = 239 - 269 pm, CN = 9). In the crystal structure of neodymium meta-borate Nd(BO 2 ) 3 (NdB 3 O 6 ; monoclinic, C2/c; a = 983.24(9), b = 809.32(7), c = 637.71(6) pm, β = 126.639(8)°; Z = 4) both [BO 3 ] 3 − triangles (d(B-O) = 133 - 142 pm, CN = 3) and [BO 4 ] 5 − tetrahedra (d(B-O) = 145 - 149 pm, CN = 4) are present. They share common corners forming chains of the composition 1 ∞ {([(B1)(O1) e 2/1 (O2) e 2/1 ][(B2)(O1) e 1/1 (O2) e 1/1 (O3) t 1/1 ]2) 3− } (≡ 1 ∞ {(BO 2 ) − }) which run parallel to the [101] direction and are interconnected by Nd 3+ cations in tenfold coordination of oxygen atoms (d(Nd-O) = 238 - 280 pm, CN = 10).

June 2, 2014

Synthesis and Structure of 1-{2,2-Dimethyl-4,6-dioxo-5-(1-pyridinio)-1,3- dioxan-5-yl}pyridinium Ylide: A New Route to Meldrum’s Acid Derivatives

Norbert Kuhn, Ahmed Al-Sheikh, Manfred Steimann

Page range: 381-384

Abstract

2-Bromo-5,5-dimethyl-4,6-dioxo-1,3-dioxine (3) reacts with pyridine and aqueous potassium carbonate to give 1-{2,2-dimethyl-4,6-dioxo-5-(1-pyridinio)-1,3-dioxan-5-yl}pyridinium ylide (5). The crystal structure analysis confirms the betaine nature of 5 consisting of two distored ring fragments [interplanar angle 58.0(4)°] connected by a C-N single bond [1.440(1) Å ].

June 2, 2014

The NaCl Adduct of the Iron-Indium Compound Fe₂(CO)₆(μ-CO)(μ-InR)₂ [R = C(SiMe₃)₃] – a One-Dimensional Coordination Polymer with Sodium Oxygen Bridges

Werner Uhl, Fritjof Schmock, Wolfgang Petz

Page range: 385-388

Abstract

The organoindium subhalide [R(Cl)In-In(Cl)R] 2 [R = C(SiMe 3 ) 3 ] 1 reacts with Na 2 [Fe 2 (CO) 8 ] to form an iron-indium coordination compound which was isolated as the sodium choride adduct [Na(THF) 4 ][Fe 2 (CO) 6 (μ-CO)(μ-InR) 2 Cl] 2. The iron atoms of 2 are bridged by a CO ligand and two InR groups, the indium atoms of which are further connected by the μ 2 -bridging chlorine atom. Four THF molecules and two oxygen atoms of terminal CO ligands of different anions span the coordination sphere of the sodium cations to give a one-dimensional coordination polymer in the solid state.

June 2, 2014

On Attempts to Synthesize Lanthanide Complexes of the Dianionic Fluorenyl-alkoxo Ligand [C₁₃H₈-cyclo-C₆H₁₀-O]^2-. Crystal Structure of (C₁₃H₉-cyclo-C₆H₁₀-O)LaI₂(DME)₂

Alexander A. Trifonov, Mikhail N. Bochkarev, Herbert Schumann, Sebastian Dechert

Page range: 389-394

Abstract

Racemic trans-2-(9(H)-fluoren-9-yl)cyclohexanol, C 13 H 9 -cyclo-C 6 H 10 -OH (1), reacts with two equivalents of potassium naphthalenide in THF to give the dipotassium salt [C 13 H 8 -cyclo-C 6 H 10 -O]- K 2 (THF) (2). Recrystallization of 2 from pyridine affords the solvent free salt [C 13 H 8 -cyclo-C 6 H 10 - O]K 2 (3). The reactions of LaI 3 (THF) 4 with one equivalent of 2 or of YbI 2 (THF) 2 with equimolar amounts of 2 produce the alkoxolanthanum diiodide (C 13 H 9 -cyclo-C 6 H 10 -O)LaI 2 (DME) 2 (4) and the ytterbium dialkoxide (C 13 H 9 -cyclo-C 6 H 10 -O) 2 Yb(THF) 0.5 (5), respectively. [(Me 3 Si) 2 N] 3 Y reacts with three equivalents of 1 with elimination of hexamethyldisilazane and formation of the yttrium trialkoxide (C 13 H 9 -cyclo-C 6 H 10 -O) 3 Y (6). The compounds 2 to 5 were characterized by elemental analyses, 1 H NMR, 13 C NMR and IR spectra. The molecular structure of 4 was determined by single crystal X-ray diffraction.

June 2, 2014

Zinc (Hydrogen-β-glutamate)-chloride Hydrate [Zn (β-GluH)Cl(H₂O)], a One-dimensional Coordination Polymer

Frank Wiesbrock, Hubert Schmidbaur

Page range: 395-398

Abstract

Zinc (hydrogen-β -glutamate) chloride hydrate is readily prepared from equimolar quantities of [Zn (β -GluH) 2 ] and ZnCl 2 in water. The crystal structure shows a coordination polymer with zinc atoms bridged by the 3-ammonio-glutarate ligand. The tetrahedral coordination sphere of the metal atom is completed by the chloride anion and the water molecule.

June 2, 2014

Preparation and Crystal Structures of Ternary Rare Earth Silver and Gold Arsenides LnAgAs₂ and LnAuAs₂ with Ln = La–Nd, Sm, Gd, and Tb

Marcus Eschen, Wolfgang Jeitschko

Page range: 399-409

Abstract

The 14 arsenides LnAgAs 2 and LnAuAs 2 (Ln = La-Nd, Sm, Gd, Tb) were prepared by reaction of stoichiometric mixtures of the elemental components at high temperatures and characterized by Xray diffractometry. The silver compounds LaAgAs 2 and CeAgAs 2 and the gold compounds LnAuAs 2 (Ln = Ce-Nd, Sm, Gd, Tb) crystallize with HfCuSi 2 type structure (P4/nmm, Z = 2). Of these, the structures of CeAgAs 2 (a = 408.5(1), c = 1048.2(1) pm, conventional residual R = 0.017 for 261 structure factors and 12 variable parameters) and CeAuAs 2 (a = 411.4(1), c = 1015.3(2) pm, R = 0.030 for 428 F values) were refined from four-circle diffractometer data. The silver compounds LnAgAs 2 (Ln = Pr, Nd, Sm, Gd, Tb) are isotypic with the antimonide SrZnSb 2 (Pnma, Z = 4) as demonstrated by a single-crystal structure refinement of PrAgAs 2 (a = 2107.3(4), b = 401.7(1), c = 407.8(1) pm, R = 0.042 for 746 F values and 26 variables). The gold compound LaAuAs 2 (I4/mmm, Z = 4, a = 416.9(1), c = 2059.5(3) pm, R = 0.038 for 303 F values and 13 variables) was found to be isotypic with the bismuthide SrZnBi 2 , again by a refinement from single-crystal diffractometer data. In the structures of CeAgAs 2 , LaAuAs 2 , and CeAuAs 2 large displacement parameters perpendicular to the four-fold axes were found for one of the two arsenic positions. These structures could also be refined with split positions for these arsenic atoms, which allow for considerable As-As bonding, resulting in a formal charge of −1 for these atoms. Chemical bonding in these compounds can thus be rationalized by a simple model corresponding to the formula Ln +3 T +1 As −1 As −3 (T = Ag, Au), where the superscripts indicate oxidation numbers.

June 2, 2014

Synthese, Kristallstruktur und spektroskopische Charakterisierung von Bis(dimethylammonium)hexachlorotitanat [Me₂NH₂]₂[TiCl₆]/ Synthesis, Crystal Structure, and Spectroscopic Characterization of Bis(dimethylammonium) Hexachlorotitanate [Me₂NH₂]₂[TiCl₆]

Stefan Rannabauer, Wolfgang Schnick

Page range: 410-414

Abstract

By the reaction of (Me 3 SiNH) 2 SiClNMe 2 with TiCl 4 the by-product [Me 2 NH 2 ] 2 [TiCl 6 ] was obtained in form of crystals suitable for single-crystal XRD (Pnnm, Z = 2, a = 722.01(3), b = 1428.36(5), c = 703.31(3) pm, T = 200 K, 901 independent reflections, 57 variables, R1 = 0.0636). The product was also synthesized in higher yield by the stoichiometric reaction of two equivalents of [Me 2 NH 2 ]Cl with TiCl 4 in CHCl 3 at room temperature as a yellow crystalline powder. Bis(dimethylammonium) hexachlorotitanate is built up from [TiCl 6 ] 2- anions forming elongated octahedra and [Me 2 NH 2 ] + ions. The [TiCl 6 ] 2- ions are connected by the [Me 2 NH 2 ] + ions through N-H···Cl hydrogen bridges forming an arrangement which resembles that of an expanded rutile structure type. The elongation of the [TiCl 6 ]2 - octahedra was also verified by IR and Raman spectroscopy, confirming a local symmetry reduction from O h to D 4h . The solubility of [Me 2 NH 2 ] 2 [TiCl 6 ] in MeNO 2 and MeCN was determined by means of 14 N-NMR to be about 0.1 mol% and 0.3 mol%, respectively.

June 2, 2014

The Effect of High Energy Milling on the Solid State Synthesis of MnFe₂O₄ from Mixtures of MnO-Fe₂O₃ and Mn₃O₄-Fe₂O₃

V. Berbenni, A. Marinia, A. Profumo, L. Cucca

Page range: 415-422

Abstract

A thermal treatment at 900°C (under nitrogen) of a milled mixture MnO-Fe 2 O 3 yields MnFe 2 O 4 mainly as the product of the reaction between Mn 3 O 4 (produced by ball milling) and Fe 2 O 3 . Under the same experimental conditions but starting from an unmilled MnO- Fe 2 O 3 mixture, the formation of MnFe 2 O 4 is only partial and occurs through Mn 3 O 4 (formed by oxidation of MnO). The same thermal treatment (900°C under nitrogen) of a milled Mn 3 O 4 -Fe 2 O 3 mixture yields MnFe 2 O 4 mainly as the product of the reaction between Mn 3 O 4 and Mn 2 O 3 /MnO 2 (the higher Mn oxides being produced by ball milling) and Fe 2 O 3 . The effect of high energy milling is more pronounced in the case of the Mn 3 O 4 -Fe 2 O 3 system since no MnFe 2 O 4 formation is observed when starting from a physical mixture.

June 2, 2014

Behaviour of Bimetallic Pt-Pd Carbon-Supported Catalysts in Methanol Electrooxidation

G. Gökağaç, J.M. Léger, F. Hahn

Page range: 423-432

Abstract

Carbon powder supported bimetallic 8w%Pt+8w%Pd/C,8w%Pt+6w%Pd/C, 8w%Pt+4w%Pd/C, 8w%Pt+2w%Pd/C, 8w%Pt/C and 8w%Pd/C samples were prepared, characterised and tested for the electrooxidation of methanol. The particle sizes were found to depend greatly on the composition and the metal content. With pure palladium and samples rich in palladium, the diameter of the bimetallic particles was around 150 nm, but with pure Pt and samples poor in Pd it was much smaller, below 5 nm. The electrocatalytic activity of these catalysts was determined by cyclic voltammetry and polarization curves. Compounds with 33 and 43 at%Pd were the most active catalysts for the methanol oxidation reaction. A good correlation was obtained between electrochemistry and in situ infrared reflectance spectroscopy results.

June 2, 2014

Crystal Structure and Magnetic Properties of a Dinuclear Iron(III) Doubly Oxygen Bridged Schiff Base Complex

A. Elmali, Y. Elerman, C. T. Zeyrek, I. Svoboda

Page range: 433-437

Abstract

[Fe(L)Cl] 2 (L = N-(4-methylphenyl)-3-methoxy-salicylaldimimine) was synthesized and its crystal structure determined. [C 30 H 26 Cl 2 Fe 2 N 2 O 6 ], triclinic, space group P 1̄ , a = 9.278(2), b = 9.4050(10), c = 10.489(2) Å , α = 64.43(2), β = 74.540(10), γ = 62.40(2)° , V = 729.1(2) Å 3 , Z = 1. Two identical [Fe(L)Cl] fragments, related by an inversion center, are connected by two bridging O atoms to form a binuclear unit. The iron(III) centers are separated by 3.196(2) Å and weakly antiferromagnetically coupled (J = -10.1(1) cm -1 ), as derived from temperature-dependent magnetic susceptibility measurements in the range 5.1-283.5 K.

June 2, 2014

seco-Dolastanes from the Marine Brown Alga Dictyota dichotoma (Huds.) Lamour

Muhammad Shaiq Ali, Muhammad Kashif Pervez

Page range: 438-442

Abstract

Brown alga Dictyota dichotoma (Dictyotaceae) collected from Karachi coast of Arabian Sea yielded two new seco-dolastanes (diterpenoids) named: dichotone and dichotodione along with isolinearol acetate of the same skeleton as a new source. Their structures have been characterized with the aid of 2D-NMR spectroscopic techniques.

June 2, 2014

Large Scale Synthesis of 4’-(4-Bromophenyl)-2,2’:6’,2”-terpyridine and Nature of the Mysterious Green By-product

Ulrich Siemeling, Jens Vor der Brüggen, Udo Vorfeld, Anja Stammler, Hans-Georg Stammler

Page range: 443-446

Abstract

4’-(4-Bromophenyl)-2,2’:6’,2”-terpyridine (5) was prepared on a large scale (up to 100 g batches) from 2-[3-(4-bromophenyl)-1-oxoprop-2-enyl]pyridine (3a) and N-[2-oxo-2-(2-pyridyl)- ethyl]pyridinium iodide (4). In the presence of substoichiometric amounts of 4, 1-[3-(4- bromophenyl)indolizin-1-yl-1-imino]-3-[4-bromophenyl]-1H-indolizinium iodide (6aI) was formed as an intensely coloured by-product. The synthesis of several related novel indolizinium derivatives is described, including 1-[3-(4-methylphenyl)indolizin-1-yl-1-imino]-3-[4-methylphenyl]-1Hindolizinium hexafluorophosphate (6cPF6), whose crystal structure has been determined.

June 2, 2014

C-Substituierte Cyclame aus Cyclotetrapeptiden [1]/ C-Substituted Cyclams from Cyclotetrapeptides [1]

Markus A. Lang, Wolfgang Beck

Page range: 447-450

Abstract

The reduction of cyclotetrapeptides cyclo(X-β -Ala-X-β -Ala) (X = Gly, (S)-Ala, (S)-Leu, (S)-Val, (S)-Phe) 1a - 1e with LiAlH 4 in THF gives the C-substituted cyclams 2a - 2e.

June 2, 2014

Synthesis of the Pyrrole-Imidazole Alkaloid Sventrin from the Marine Sponge Agelas sventres

Gregor Breckle, Kurt Polborn, Thomas Lindel

Page range: 451-456

Abstract

The marine pyrrole-imidazole alkaloid sventrin (1) and the hitherto unknown dehydrooroidin (3) have been synthesized stereoselectively via alkyne intermediates. The pathways start from a 2-azido-4-alkynylimidazole which can be chemo- and stereoselectively reduced to the corresponding amino alkene using NaAlH 2 (OCH 2 CH 2 OMe) 2 (Red-Al) or, alternatively, to the amino alkyne. Selective removal of simultaneously present Boc or trityl protecting groups was possible employing either p-TsOH or acetic resp. formic acid.

June 2, 2014

Carboxylic Acid Analogues of Fosmidomycin

Thomas Kurz, Detlef Geffken, Claudia Wackendorff

Page range: 457-461

Abstract

N-Alkylation of N-Boc-O-benzylhydroxylamine (1) with benzyl 4-bromobutyrate (2) in DMF gave N,O-bisprotected benzyl 4-hydroxyamino-butyrate (3), which was converted into 4-benzyloxyamino-butyric acid benzyl ester (4) with TFA in methylene chloride. Treatment of 4 with formic acid/acetic anhydride or various acid chlorides followed by catalytic hydrogenation led to 4-(N-acyl-N-hydroxyamino)-butyric acids 6.

June 2, 2014

Effective Mummification Compounds Used in Pharaonic Egypt: Reactivity on Bone Alkaline Phosphatase

Johann Koller, Ursula Baumer, Yoka Kaup, Mirjam Schmid, Ulrich Weser

Page range: 462-480

Abstract

In Pharaonic Egypt from the Old Kingdom up to the Ptolemaic Period the deceased were pre-treated in the course of the mummification process using a wealth of embalming components including resins and many different wood tars. GC/MS studies allowed the elucidation of a great number of clearly separated compounds found in the ancient embalming material. Phenols, guaiacols, naphthalenes, monoterpenes, sesquiterpenoids, oxidised diterpene resin acids and triterpenoids were noticed. These results and particularly the detection of an unused embalming material shed some new light on the possible way as to how the different embalming materials might have been prepared and applied. It was striking to see the accordance of the present data with the well-known treatises by Herodotus (490-425 B. C.) and by Pliny the Elder (23/24-79 A. C.). The impact of the historical observations on modern science and in return the dramatic promotion of ancient texts stimulated by the present study is intriguing. An enzyme, alkaline phosphatase, bound inside mummified bones was a useful tool to reveal the efficacy of the embalming materials. Initial data showed that alkaline phosphatase isolated from embalmed bones from the Old Kingdom and the Ptolemaic Period was significantly more abundant and displayed a higher activity compared to the properties of the corresponding enzyme from non-treated mummified bones. Additionally, in a model study porcine ribs were pre-treated with four selected embalming compounds - guaiacol, limonene, α-pinene and p-cymene - and subsequently air-dried. Among the four selected compounds guaiacol was the most reactive species in the course of the preservation process. The specific activity of bone alkaline phosphatase rose 12-fold compared to that of the control. The enzyme itself remained unharmed as the observed relative molecular mass was surprisingly identical with the contemporary enzyme. It was again striking that the guaiacol derivatives were richly abundant in the unused embalming material mentioned above.

June 2, 2014

2-Amino-1,3-dimethylimidazolium 2,2-Dimethyl-4,6-dioxo-1,3-dioxanide. First Structural Characterisation of the Anion of Meldrum’s Acid [1]

Norbert Kuhn, Ahmed Al-Sheikh, Manfred Steimann

Page range: 481-484

Abstract

2-Amino-1,3-dimethylimidazolium 2,2-dimethyl- 4,6-dioxo-1,3-dioxanide (6) has been obtained from the reaction of 2,2-dimethyl-4,6-dioxo-1,3- dioxan (1, “Meldrum’s acid”) and 2-imino-1,3-dimethylimidazoline (5) in excellent yield. The unit cell of 6 contains two crystallographically independent anions lying on crystallographic mirror planes. The structure of the anion is compared with that of compound 1.

June 2, 2014

Vibrational Spectra of the Layered Compound [(VO₂)₂(4,4-bipy)_0.5(4,4′- Hbipy)(PO₄)]·H₂O

Enrique J Baran, Kwang-Hwa Lii

Page range: 485-488

Abstract

The infrared and Raman spectra of the title complex were recorded and assignments for the VO + 2 , PO 3- 4 and V-O and V-N skeletal vibrations are proposed. The results are of interest in relation to the vibrational-spectroscopic properties of the active site of vanadium haloperoxidases.

June 2, 2014

A Hydrogen Bonded Aluminium Alkoxide Hydroxide Aggregate Resulting from the Exposure of Methylaluminium Dichloride to Air

Norbert W. Mitzel, Christian Lustig

Page range: 489-492

Abstract

Exposure of methylaluminium dichloride to air results in the formation of a crystalline hydrolysis/ oxidation product of the composition [(MeOAlCl 2 ) 3 ][(MeOAlCl 2 ) 2 (HOAlCl 2 )], which is linked by a H···Cl hydrogen bond in the solid state. Oxygen is thus inserted into the carbon-aluminium bond in the primary reaction, whereas hydrolysis plays only a minor role.

June 2, 2014

Zinc Bis[μ-N,N′-chlorozinc-bis(N-trimethylsilylimino- diphenylphosphoranyl)- methanediide]: A Zinc Derivative of a Geminal Carbdianion

Tobias Bollwein, Matthias Westerhausen, Arno Pfitzner

Page range: 493-496

Abstract

The trinuclear title compound, C 74 H 88 Cl 2 N 4 P 4 - Si 4 Zn 3 , is derived from a geminally substituted carbdianion. The central zinc atom shows a nearly linear coordination geometry with very short Zn- C bond lengths (average 191 pm). The peripheral metal centers of the chlorozinc moieties are chelated by the phosphanimine donors and hence are triply coordinated, thus forming a six-membered CP 2 N 2 Zn ring with Zn-N distances of 195 pm (average).

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.

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

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

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Volume 58 Issue 5

Issue of Zeitschrift für Naturforschung B

Organoaluminium and -Gallium Compounds with O-Oximato Substituents

Abstract

Three-Membered Ring Formation by Si···N Interactions in Aminosulfenylsilanes

Abstract

Einkristalle des Neodym(III)-meta-Borats Nd(BO2)3 und -ortho-Borats Nd[BO3]/Single Crystals of the Neodymium(III) meta-Borate Nd(BO2)3 and ortho-Borate Nd[BO3]

Abstract

Synthesis and Structure of 1-{2,2-Dimethyl-4,6-dioxo-5-(1-pyridinio)-1,3- dioxan-5-yl}pyridinium Ylide: A New Route to Meldrum’s Acid Derivatives

Abstract

The NaCl Adduct of the Iron-Indium Compound Fe2(CO)6(μ-CO)(μ-InR)2 [R = C(SiMe3)3] – a One-Dimensional Coordination Polymer with Sodium Oxygen Bridges

Abstract

On Attempts to Synthesize Lanthanide Complexes of the Dianionic Fluorenyl-alkoxo Ligand [C13H8-cyclo-C6H10-O]2-. Crystal Structure of (C13H9-cyclo-C6H10-O)LaI2(DME)2

Abstract

Zinc (Hydrogen-β-glutamate)-chloride Hydrate [Zn (β-GluH)Cl(H2O)], a One-dimensional Coordination Polymer

Abstract

Preparation and Crystal Structures of Ternary Rare Earth Silver and Gold Arsenides LnAgAs2 and LnAuAs2 with Ln = La–Nd, Sm, Gd, and Tb

Abstract

Synthese, Kristallstruktur und spektroskopische Charakterisierung von Bis(dimethylammonium)hexachlorotitanat [Me2NH2]2[TiCl6]/ Synthesis, Crystal Structure, and Spectroscopic Characterization of Bis(dimethylammonium) Hexachlorotitanate [Me2NH2]2[TiCl6]

Abstract

The Effect of High Energy Milling on the Solid State Synthesis of MnFe2O4 from Mixtures of MnO-Fe2O3 and Mn3O4-Fe2O3

Abstract

Behaviour of Bimetallic Pt-Pd Carbon-Supported Catalysts in Methanol Electrooxidation

Abstract

Crystal Structure and Magnetic Properties of a Dinuclear Iron(III) Doubly Oxygen Bridged Schiff Base Complex

Abstract

seco-Dolastanes from the Marine Brown Alga Dictyota dichotoma (Huds.) Lamour

Abstract

Large Scale Synthesis of 4’-(4-Bromophenyl)-2,2’:6’,2”-terpyridine and Nature of the Mysterious Green By-product

Abstract

C-Substituierte Cyclame aus Cyclotetrapeptiden [1]/ C-Substituted Cyclams from Cyclotetrapeptides [1]

Abstract

Synthesis of the Pyrrole-Imidazole Alkaloid Sventrin from the Marine Sponge Agelas sventres

Abstract

Carboxylic Acid Analogues of Fosmidomycin

Abstract

Effective Mummification Compounds Used in Pharaonic Egypt: Reactivity on Bone Alkaline Phosphatase

Abstract

2-Amino-1,3-dimethylimidazolium 2,2-Dimethyl-4,6-dioxo-1,3-dioxanide. First Structural Characterisation of the Anion of Meldrum’s Acid [1]

Abstract

Vibrational Spectra of the Layered Compound [(VO2)2(4,4-bipy)0.5(4,4′- Hbipy)(PO4)]·H2O

Abstract

A Hydrogen Bonded Aluminium Alkoxide Hydroxide Aggregate Resulting from the Exposure of Methylaluminium Dichloride to Air

Abstract

Zinc Bis[μ-N,N′-chlorozinc-bis(N-trimethylsilylimino- diphenylphosphoranyl)- methanediide]: A Zinc Derivative of a Geminal Carbdianion

Abstract

Einkristalle des Neodym(III)-meta-Borats Nd(BO₂)₃ und -ortho-Borats Nd[BO₃]/Single Crystals of the Neodymium(III) meta-Borate Nd(BO₂)₃ and ortho-Borate Nd[BO₃]

The NaCl Adduct of the Iron-Indium Compound Fe₂(CO)₆(μ-CO)(μ-InR)₂ [R = C(SiMe₃)₃] – a One-Dimensional Coordination Polymer with Sodium Oxygen Bridges

On Attempts to Synthesize Lanthanide Complexes of the Dianionic Fluorenyl-alkoxo Ligand [C₁₃H₈-cyclo-C₆H₁₀-O]^2-. Crystal Structure of (C₁₃H₉-cyclo-C₆H₁₀-O)LaI₂(DME)₂

Zinc (Hydrogen-β-glutamate)-chloride Hydrate [Zn (β-GluH)Cl(H₂O)], a One-dimensional Coordination Polymer

Preparation and Crystal Structures of Ternary Rare Earth Silver and Gold Arsenides LnAgAs₂ and LnAuAs₂ with Ln = La–Nd, Sm, Gd, and Tb

Synthese, Kristallstruktur und spektroskopische Charakterisierung von Bis(dimethylammonium)hexachlorotitanat [Me₂NH₂]₂[TiCl₆]/ Synthesis, Crystal Structure, and Spectroscopic Characterization of Bis(dimethylammonium) Hexachlorotitanate [Me₂NH₂]₂[TiCl₆]

The Effect of High Energy Milling on the Solid State Synthesis of MnFe₂O₄ from Mixtures of MnO-Fe₂O₃ and Mn₃O₄-Fe₂O₃

Vibrational Spectra of the Layered Compound [(VO₂)₂(4,4-bipy)_0.5(4,4′- Hbipy)(PO₄)]·H₂O