Published by De Gruyter

Volume 57 Issue 2

Issue of Zeitschrift für Naturforschung B

Contents
Journal Overview

June 2, 2014

Crystal Structures and Properties of Eu₂GeSe₄ and Eu₂Ge₂Se₅

M. Tampier, D. Johrendt, R. Pöttgen, G. Kotzyba, C. Rosenhahn, B. D. Mosel

Page range: 133-140

Abstract

Europium selenogermanate(IV) and Europium selenogermanate(III) were synthesized by direct reactions of the elements at 1023 K and their crystal structures determined by single crystal methods. α-Eu 2 GeSe 4 (P21, a = 6.964(1), b = 7.055(2), c = 8.400(2) Å , β = 108.12(2)˚, Z = 2) crystallizes as a polar variant of the monoclinic Sr 2 GeS 4 -type at room temperature. At 673 K, the structure is centrosymmetric (β-Eu 2 GeSe 4 , P2 1 /m, a = 6.969(1), b = 7.059(2), c = 8.516(2)Å , β = 107.99(2)˚, Z = 2), and a phase transition P2 1 →P2 1 /m as known from Eu 2 GeS 4 is highly probable. Eu 2 Ge 2 Se 5 (P2 1 /n, a = 8.421(4), b = 12.235(4), c = 9.127(3) Å,β = 93.67(4)˚, Z = 4) crystallizes in the Sr 2 Ge 2 Se 5 type, mainly characterized by complex [Ge 4 Se 10 ] 8- anions with homonuclear Ge-Ge bonds. Both compounds are deep red Zintl phases according to (Eu 2+ ) 2 Ge 4+ (Se 2- ) 4 and (Eu 2+ ) 2 (Ge 3+ ) 2 (Se 2- ) 5 . Magnetic susceptibility measurements show paramagnetic behavior above 20Kwith magnetic moments of 8.00(5) μB/Eu and 8.10(5) μB/Eu, respectively, indicating Eu 2+ . Eu 2 Ge 2 Se 5 orders antiferromagnetically at T N = 4.2(2) K and undergoes a metamagnetic transition at 2 K at a critical field of 0.5(3) T. The saturation moment at 2.2 K and 5.5 T is 7.00(2) μB/Eu. Eu 2 GeSe 4 is a ferromagnet with T C = 5.8(2) K and a saturation moment at 2.2 K and 5.5 T of 6.92(2) μB/Eu. 151 Eu Mössbauer spectroscopic measurements of Eu 2 GeSe 4 and Eu 2 Ge 2 Se 5 at 78 K show isomer shifts of -12.43(4) mm/s and -12.69(5) mm/s, respectively, in accordance with divalent europium.

June 2, 2014

Gallium-Gallium Single Bonds Terminally Coordinated by Tropolonato Ligands

Werner Uhl, Malte Prött, Gertraud Geiseler, Klaus Harms

Page range: 141-144

June 2, 2014

Synthesis and Structures of Bis(pentafluorophenyl) Selenoxide / Telluroxide

Thomas M. Klapötke, Burkhard Krumm, Peter Mayer, Oliver P. Ruscitti

Page range: 145-150

Abstract

Bis(pentafluorophenyl) selenoxide and telluroxide were prepared by oxidation of the corresponding selenide and telluride with m-chloroperbenzoic acid. (C 6 F 5 ) 2 SeO crystallizes in the triclinic space group P1 with a = 9.9452(9), b = 14.871(2), c = 15.279(2) Å , a = 117.17(1), β = 101.02(1), γ = 95.39(1)°. The telluroxide (C 6 F 5 ) 2 TeO crystallizes as a dichloromethane or benzene solvate. The crystallographic data are for (C 6 F 5 ) 2 TeO · CH 2 Cl 2 : monoclinic space group P2 1 /n with a = 18.1918(2), b = 7.7545(1), c = 23.1719(3) Å , β = 97.9523(4)°; for (C 6 F 5 ) 2 TeO ÿ 1 / 2 C 6 H 6 : triclinic space group P1̄ with a = 5.7064(1), b = 10.9473(1), c = 12.1476(1) Å , a = 81.5366(8), γ = 86.8528(8), γ = 88.0700(5)°. The selenoxide forms hexamers, the telluroxide forms strong dimers with chalcogen-oxygen interactions.

June 2, 2014

Experimental and Theoretical Study on the Structure of Nitramide H₂NNO₂

Angelika Häußler, Thomas M. Klapötke, Holger Piotrowski

Page range: 151-156

Abstract

Nitramide was investigated by multinuclear NMR spectroscopy, X-ray-diffraction and computational methods. The crystal structure analysis at various temperatures reveals a planar conformation of the molecule with a N-N bond length corresponding to a bond order between one and two. Hydrogen bonds connect the nitramide molecules side-on and end-on. This leads to the formation of layers in the crystal. Calculations were performed to explain the shorter N-N bond length in the crystal compared to the gas phase. The nitramide trimer is used as a model.

June 2, 2014

Crystal and Molecular Structure of 1,2,4-Triazolium Chloride and its Salt with Antimony Trichloride - Bis(1,2,4-triazolium) pentachloroantimonate(III)-1,2,4-triazolium Chloride

Maciej Bujak, Jacek Zaleski

Page range: 157-164

Abstract

The structures of 1,2,4-triazolium chloride (C 2 H 4 N 3 )Cl and its derivative with antimony trichloride - (C 2 H 4 N 3 ) 2 [SbCl 5 ] · (C 2 H 4 N 3 )Cl containing unsubstituted 1,2,4-triazolium cations were determined. (C 2 H 4 N 3 )Cl crystallizes in the monoclinic system, space group P2 1 /n with the unit cell dimensions at 86 K: a = 9.425(2), b = 8.557(2), c = 11.158(2)Å , β = 95.87(3)°; V = 895.2(3)Å 3 , Z=8, dc = 1.566, d m = 1.56(2) g·cm -3 .At roomtemperature, crystals of (C 2 H 4 N 3 ) 2- [SbCl 5 ] · (C 2 H 4 N 3 )Cl are orthorhombic, space group P2 1 2 1 2 1 , a = 8.318(2), b = 11.381(2), c = 19.931(4) Å, V = 1886.8(7) Å 3 , Z = 4, d c = 1.917, d m = 1.91(2) g·cm -3 . In both crystals the 1,2,4-triazole rings are planar. The anionic sublattice of (C 2 H 4 N 3 ) 2 [SbCl 5 ]·(C 2 H 4 N 3 )Cl consists of polymeric [SbCl 5 ] n 2- zig-zag chains composed of distorted [SbCl 6 ] 3- octahedra connected via their vertices and the single Cl - anions. The cavities between the inorganic chains are filled by 1,2,4-triazolium cations. The nature of the distortion of the [SbCl 6 ] 3- polyhedra has been studied by examining correlations between the Sb-Cl bond lengths and the strength of hydrogen bonds, which join the anionic sublattice and the organic cations. This study confirms that the deformation of the [SbCl 6 ] 3- octahedra is caused by hydrogen bonds.

June 2, 2014

Quaternary Phosphide Oxides Pr₃Cu₄P₄O_2–x and Sm₃Cu₄P₄O_2–x with Ordered Zr₃Cu₄Si₆-Type Structure

Joachim W. Kaiser, Wolfgang Jeitschko

Page range: 165-170

Abstract

The compounds Ln 3 Cu 4 P 4 O 2-χ (Ln = Pr, Sm) were prepared by annealing the elemental components in a NaCl/KCl flux. They crystallize with an ordered Zr 3 Cu 4 Si 6 -type structure (space group I4/mmm, Z = 2), which was refined from single-crystal X-ray data for both compounds; Pr 3 Cu 4 P 4 O 2-χ : a = 397.8(1), c = 2658.7(3) pm, R = 0.046 for 235 structure factors and 19 variable parameters; Sm 3 Cu 4 P 4 O 2-χ : a = 392.8(1), c = 2643.6(3) pm, R = 0.057 for 145 F values and 19 variables. The refinements showed partial occupancy for the oxygen positions resulting in approximately 1.5 oxygen atoms per formula unit. Half of the phosphorus atoms form pairs with typical two-electron bond distances of 222.8(4) and 221.7(8) pm, respectively. Using oxidation numbers chemical bonding in these phosphide oxides can be rationalized with the formula (Ln +3 ) 3 (Cu +1 ) 4 (P-P) -4 (P -3 ) 2 (O -2 ) 1.5 . Hence, the empirical formula may also be doubled (Ln 6 Cu 8 P 8 O 3 ), and the compounds are expected to be semiconducting.

June 2, 2014

S-, X-, Q- undW-Band-Pulver-EPR-Untersuchungen am mononuklearen Au^II-Komplex [Au^II([9]anS₃)₂](BF₄)₂ / S-, X-, Q- und W-Band Powder-EPR Investigations on the Mononuclear Au^II-Complex [Au^II([9]aneS₃ )₂](BF₄)₂

Lars Ihlo, Michael Kampf, Rolf Böttcher, Reinhard Kirmse

Page range: 171-176

Abstract

Powder-EPR-studies at T = 295, 130 and 13 K of the thiacrown ether Au II complex [Au II ([9]aneS 3 ) 2 ](BF 4 ) 2 diamagnetically diluted by the corresponding Zn II complex are reported. Due to the small anisotropy of the g and the 197 Au hyperfine tensor A Au , a large 197 Au quadrupole interaction and the noticeable linewidts, the powder spectra show a very complex pattern. Using S-band (2.4 GHz), X-band (9.5 GHz), Q-band (35 GHz) and W-band (94 GHz) frequencies the spectra could be analysed successfully. The spectra were simulated with a computer program which diagonalizes the spin-Hamiltonian matrix exactly. According to EHT-MO calculations most of the spin-density is located in an AuS 4 unit of the distorted AuS 6 unit.

June 2, 2014

Supersilyliertes Ammoniak und supersilyliertes Hydrazin: Synthese, Struktur und Eigenschaften / Supersilyl Ammonia and Supersilyl Hydrazine: Synthesis, Structure and Properties

Hans-Wolfram Lerner, Nils Wiberg, Michael Bolte, H. Nöth, J. Knizek

Page range: 177-182

Abstract

An excellent supersilylation agent, supersilyl triflate, tBu 3 SiO 3 SCF 3 , is easily obtained from tBu 3 SiH and CF 3 SO 3 H. Supersilyl triflate, tBu 3 SiO 3 SCF 3 , reacts with lithium amide or lithium hydrazide to form the supersilyl amine, tBu 3 SiNH 2 , or the supersilyl hydrazines, tBu 3 SiNHNH 2 and tBu 3 SiNH-HNSitBu 3 , respectively. The structures of supersilyl triflate, tBu 3 SiO 3 SCF 3 , and bissupersilyl hydrazine, tBu 3 SiNH-HNSitBu 3 , have been determined by X-ray structure analysis.

June 2, 2014

Synthesis and Structure of trans-Dichloro-tetra(pyrazole)-gallium(III) Chloride and Tetrachlorogallate(III)

Stefan Nogai, Annette Schier, Hubert Schmidbaur

Page range: 183-186

Abstract

[GaCl 2 (pyrazole) 4 ] + Cl - and [GaCl 2 (pyrazole) 4 ] + GaCl 4 - are formed in the reaction of pyrazole and anhydrous gallium trichloride in toluene/diethyl ether. The crystal structure of the chloride salt shows cations in a trans-conufiguration which are associated with the chloride counterions through N-H- -Cl hydrogen bonds.

June 2, 2014

Synthesis and Characterization of Mn₆(PO₄)₄·H₂O, a New Metal(II) Phosphate Hydrate

N. Stock

Page range: 187-192

Abstract

The new manganese phosphate hydrate,Mn 6 (PO 4 ) 4· H 2 O, has been obtained as a single phase product using hydrothermal methods and the structure has been determined by single crystal X-ray diffraction. The title compound crystallizes in the monoclinic space group Cc with a = 934.18(10), b = 1743.68(18), c = 815.15(8) pm, β = 92.616(2)°, V = 1326.4(2)·10 6 pm 3 , Z = 4, and the refinement led to R1 = 0.0281 and Rw2 = 0.0728 (all data). The structure is composed of [PO 4 ] and [MnO x ] polyhedra (x = 6, 7) and might be described as a distorted primitive hexagonal packing of [PO 4 ] tetrahedra which are held together by Mn 2+ ions partially located in distorted trigonal prismatic positions. This leads to a dense three-dimensional framework structure. Magnetic susceptibility measurements verified the presence of high-spin Mn 2+ ions and thermogravimetric data confirm the chemical composition deduced from the single crystal structure determination.

June 2, 2014

Carbon Supported Pt+Os Catalysts for Methanol Oxidation

Gülsün Gökağaç, Brendan J. Kennedy

Page range: 193-201

Abstract

11% Pt/C, 10% Pt + 1%Os/C, 9% Pt + 2%Os/C, 8% Pt + 3%Os/C, 7% Pt + 4%Os/C, 6% Pt + 5%Os/C and 5%Pt + 6% Os/C catalysts have been prepared for methanol oxidation reaction. Transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and cyclic voltammetry have been used to understand the nature of the species present in these catalysts. 7% Pt + 4% Os/C was the most active catalyst, while 8% Pt + 3% Os/C was the least active one. It is found that the metal particle size and distribution on the carbon support, the surface composition and the oxidation states of the metal particles, the metal-metal and metal support interactions are important parameters to define the activity of the catalyst.

June 2, 2014

The Molecular Structures of the Three Disilylbenzenes Determined in the Gas Phase, the Solid State and by ab initio Calculations

Norbert W. Mitzel, Paul T. Brain, Michael A. Hofmann, David W. H. Rankin, Robert Schröck, Hubert Schmidbaur

Page range: 202-214

Abstract

The molecular structures of four silylbenzenes (benzenes with H 3 Si-substituents), viz. silylbenzene, 1,2-, 1,3- and 1,4-disilylbenzene, were studied by electron diffraction in the gas phase and by ab initio calculations. The structures of 1,2- and 1,4-disilylbenzene were also determined by X-ray diffraction experiments on single crystals grown in situ. The results are compared and discussed with the focus on the evaluation of the SARACEN method for the analysis of gas-phase data, and particularly on its ability to deal with small structural distortions. Important experimental structural parameters are the Si-C bond lengths [Å] and the ipso C-C-C angles [deg], which are 1.863(3) / 118.2(2) for gaseous silylbenzene (r α ), 1.875(2) / 119.9(2) for gaseous and 1.870(2) / 118.7(av) for solid 1,2-disilylbenzene, 1.871(1) / 119.4(3) for gaseous 1,3-disilylbenzene, 1.870(2) / 119.0(2) for gaseous and 1.866(3) / 117.4(2) for solid 1,4-disilylbenzene. The angle distortions in the benzene ring geometries are analysed and interpreted in terms of an additivity rule of the distortion caused by each of the silyl substituents. This additivity scheme predicts excellently the observed structures of the silylbenzenes and is in best agreement with the structures calculated ab initio. The slight distortion of molecular symmetry in the crystal structures makes a detailed comparison of the solid-state values impossible, but on average they are in good agreement with theory and predictions of the additivity model. The gas-phase values obtained by the SARACEN method show less pronounced distortions of the benzene ring geometries than observed or predicted by the other methods, but the trends of distortion are fully consistent.

June 2, 2014

Anodische Oxidation von 2-Thiobarbitursäuren unter Bildung neuartiger, tetracyclischer Dimerer / Anodic Oxidation of 2-Thiobarbituric Acids under Formation of New Tetracyclic Dimers

Hans Günter Thomas, Michael Rasp, Gerhard Raabe

Page range: 215-225

Abstract

2-Thiobarbituric acids 1 can be dimerized anodically in acceptable yields if the special ultrasonic electrolysis cell described here is used. In some cases two isomeric dimers 2 and 4 were isolated. 2 is of the same type as the corresponding barbituric acid dimers. The other dimer 4 has a completely different, tetracyclic structure characterized by NMR spectra and X-ray diffraction. The mechanism postulated for the formation of the tetracyclic dimers is supported by cyclovoltammetric measurements.

June 2, 2014

Multinuclear (₁H, ₁₃C and 15N) Magnetic Resonance Spectroscopy and Substituent Effects on N-Phenoxyethylanilines

Jorge L. Jios, Gustavo P. Romanelli, Juan C. Autino, Damian Magiera, Helmut Duddeck

Page range: 226-232

Abstract

1 H, 13 C and 15 N NMR spectra of twenty substituted N-phenoxyethylanilines 1-20 were completely and unambiguously assigned using a combination of both homo- and heteronuclear (gs-COSY), 1 H detected heteronuclear one-bond (gs-HMQC) and long-range (gs- HMBC) gradient-selected correlation experiments. Correlations between chemical shifts and substituent constants are analyzed separately for both phenyl rings using variable substituents para to the fixed substituent -OCH 2 CH 2 NHC 6 H 5 (series I) and -NHCH 2 CH 2 OC 6 H 5 (series II), respectively. The correlation coefficient for chemical shifts vs. a linear combination of inductive and resonance substituent constants is high and improves when only the six values, corresponding to each para-monosubstituted series, were used. For nitrogen chemical shifts excellent linear dependences were obtained. The results show that the ethylene chain is not able to transmit the substituent effect from one aromatic ring to the other.

June 2, 2014

Two New Triterpenes from Fern Adiantum incisum

Safdar Hayat, Atta-ur Rahman, M. Iqbal Choudhary, Khalid Mohammed Khan, Hamied Latif, Ernst Bayer

Page range: 233-238

Abstract

Two new triterpenes, adininaneone (1) and adininaonol (2) were isolated from Adiantum incisum. Three known triterpenes, adiantone (3), isoadiantone (4) and 23-hydroxyfernene (5) were also isolated for the first time from the methanolic extracts of A. insicum. The structures were elucidated with the help of modern spectroscopic techniques.

June 2, 2014

Pollen Growth Regulator, Fusanolide A, and a Related Metabolite from Fusarium sp.

A. Shimada, M. Kusano, K. Matsumoto, M. Nishibe, T. Kawano, Y. Kimurab

Page range: 239-242

Abstract

Fusanolides A (1) and B (2) were isolated from cultures of the fungus Fusarium sp. as pollen growth regulators and their structures were established by spectroscopic evidence. 1 completely inhibited pine pollen germination and tea pollen tube growth at a concentration of 300 mg/l, but 2 showed no inhibitory effect on them at the same concentration.

June 2, 2014

Synthesis of C-Glycosides from S-Glycosyl Phosphorothioates

W. Kudelsk

Page range: 243-247

Abstract

Treatment of O-benzyl protected S-glucosyl phosphorothioates with 1,3,5 trimethoxybenzene in the presence of iodine or boron trifluoride etherate led to appropriate aryl C-β-Dglucosides. The reaction of O-benzyl and O-acetyl-protected phosphorothioates of monosaccharides with allyltrimethylsilane, using boron trifluoride etherate as activator, gave mainly or exclusively, the corresponding 3-(α-D- glycopyranosyl)-1-propenes. C-Glucosidation of furan with O-benzyl protected S- glucosyl phosphorothioate in the presence of boron trifluoride etherate afforded (2- furyl)-α-C-glucoside.

June 2, 2014

Liegen in Imidazolium-Tetrafluoroboraten Wasserstoffbrückenbindungen vor? Die Struktur von 1,3-Diisopropyl-4,5-dimethylimidazolium- Tetrafluoroborat [1] / Is Hydrogen Bonding Present in Imidazolium Tetrafluoroborates? The Structure of 1,3-Diisopropyl-4,5-dimethylimidazolium Tetrafluoroborate [1]

Norbert Kuhn, Michael Walker, Manfred Steimann

Page range: 248-250

Abstract

1,3-Diisopropyl-4,5-dimethylimidazolium tetrafluoroborate (2) is obtained from 2,3-dihydro-1,3- diisopropyl-4,5-dimethylimidazol-2-ylidene (1) and HBF 4 • Et 2 O; the X-ray structure of 2 is reported.

June 2, 2014

Magnesium Anthranilate Dihydrate

Frank Wiesbrock, Annette Schier, Hubert Schmidbaur

Page range: 251-254

Abstract

The reaction mixture of magnesium chloride with two equivalents of potassium anthranilate [K + Anth - ] in water gives on cooling to 0 °C a 60% yield of a precipitate which after drying in a vacuum has the composition [Mg(H 2 O) 6 ](Anth) 2 (1). Recrystallization from hot water affords an octahydrate identified as [Mg(H 2 O) 6 ](Anth) 2 (H 2 O) 2 (2) in a single crystal X-ray diffraction study. Contrary to findings for the related calcium, strontium and barium compounds, in the magnesium compound the anthranilate anions are not part of the coordination sphere of the metal atom. Thermal degradation of 1 or 2 at 125 °C gives the anhydrous product [Mg(Anth) 2 ], 3. Alternative preparative routes employed in previous studies gave only anhydrous material. The result of the present investigation confirms the outstanding stability of the hexa(aquo) complex of magnesium, as compared to the hydrates of the larger alkaline earth metals, in the presence of potential bioligands.

June 2, 2014

Tri(1-cyclohepta-2,4,6-trienyl)- phosphane, P(C₇H₇)₃, as a Tripodal Tetradentate Ligand in Cationic, Five-coordinate Complexes of Platinum(II) and Palladium(II)

Max Herberhold, Thomas Schmalz, Bernd Wrackmeyer

Page range: 255-258

Abstract

Chloride abstraction, using AgPF 6 , from tri(1- cyclohepta-2,4,6-trienyl)phosphane platinum and palladium dichloride, [P]MCl 2 [M = Pt (1), Pd (2)], affords the complexes {[P]MCl}PF 6 [M = Pt (3), Pd (4)] in good yields. The central metal is coordinated by the chloro ligand, the phosphorus atom and by three η 2 -C=C units, one of each C 7 H 7 ring. This assignment of a highly symmetrical C 3v structure is based on a consistent set of NMR data ( 1 H, 13 C, 31 P, 195 Pt NMR), in agreement with NMR data of the corresponding known neutral iridium and rhodium complexes [P]MCl [M = Ir (5), Rh (6)]. The chemical shift δ 103 Rh of 6 was determined, and a nearly linear relationship δ 195 Pt / δ 103 Rh was established.

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 57 Issue 2

Issue of Zeitschrift für Naturforschung B

Crystal Structures and Properties of Eu2GeSe4 and Eu2Ge2Se5

Abstract

Gallium-Gallium Single Bonds Terminally Coordinated by Tropolonato Ligands

Synthesis and Structures of Bis(pentafluorophenyl) Selenoxide / Telluroxide

Abstract

Experimental and Theoretical Study on the Structure of Nitramide H2NNO2

Abstract

Crystal and Molecular Structure of 1,2,4-Triazolium Chloride and its Salt with Antimony Trichloride - Bis(1,2,4-triazolium) pentachloroantimonate(III)-1,2,4-triazolium Chloride

Abstract

Quaternary Phosphide Oxides Pr3Cu4P4O2–x and Sm3Cu4P4O2–x with Ordered Zr3Cu4Si6-Type Structure

Abstract

S-, X-, Q- undW-Band-Pulver-EPR-Untersuchungen am mononuklearen AuII-Komplex [AuII([9]anS3)2](BF4)2 / S-, X-, Q- und W-Band Powder-EPR Investigations on the Mononuclear AuII-Complex [AuII([9]aneS3 )2](BF4)2

Abstract

Supersilyliertes Ammoniak und supersilyliertes Hydrazin: Synthese, Struktur und Eigenschaften / Supersilyl Ammonia and Supersilyl Hydrazine: Synthesis, Structure and Properties

Abstract

Synthesis and Structure of trans-Dichloro-tetra(pyrazole)-gallium(III) Chloride and Tetrachlorogallate(III)

Abstract

Synthesis and Characterization of Mn6(PO4)4·H2O, a New Metal(II) Phosphate Hydrate

Abstract

Carbon Supported Pt+Os Catalysts for Methanol Oxidation

Abstract

The Molecular Structures of the Three Disilylbenzenes Determined in the Gas Phase, the Solid State and by ab initio Calculations

Abstract

Anodische Oxidation von 2-Thiobarbitursäuren unter Bildung neuartiger, tetracyclischer Dimerer / Anodic Oxidation of 2-Thiobarbituric Acids under Formation of New Tetracyclic Dimers

Abstract

Multinuclear (1H, 13C and 15N) Magnetic Resonance Spectroscopy and Substituent Effects on N-Phenoxyethylanilines

Abstract

Two New Triterpenes from Fern Adiantum incisum

Abstract

Pollen Growth Regulator, Fusanolide A, and a Related Metabolite from Fusarium sp.

Abstract

Synthesis of C-Glycosides from S-Glycosyl Phosphorothioates

Abstract

Liegen in Imidazolium-Tetrafluoroboraten Wasserstoffbrückenbindungen vor? Die Struktur von 1,3-Diisopropyl-4,5-dimethylimidazolium- Tetrafluoroborat [1] / Is Hydrogen Bonding Present in Imidazolium Tetrafluoroborates? The Structure of 1,3-Diisopropyl-4,5-dimethylimidazolium Tetrafluoroborate [1]

Abstract

Magnesium Anthranilate Dihydrate

Abstract

Tri(1-cyclohepta-2,4,6-trienyl)- phosphane, P(C7H7)3, as a Tripodal Tetradentate Ligand in Cationic, Five-coordinate Complexes of Platinum(II) and Palladium(II)

Abstract

Crystal Structures and Properties of Eu₂GeSe₄ and Eu₂Ge₂Se₅

Experimental and Theoretical Study on the Structure of Nitramide H₂NNO₂

Quaternary Phosphide Oxides Pr₃Cu₄P₄O_2–x and Sm₃Cu₄P₄O_2–x with Ordered Zr₃Cu₄Si₆-Type Structure

S-, X-, Q- undW-Band-Pulver-EPR-Untersuchungen am mononuklearen Au^II-Komplex [Au^II([9]anS₃)₂](BF₄)₂ / S-, X-, Q- und W-Band Powder-EPR Investigations on the Mononuclear Au^II-Complex [Au^II([9]aneS₃ )₂](BF₄)₂

Synthesis and Characterization of Mn₆(PO₄)₄·H₂O, a New Metal(II) Phosphate Hydrate

Multinuclear (₁H, ₁₃C and 15N) Magnetic Resonance Spectroscopy and Substituent Effects on N-Phenoxyethylanilines

Tri(1-cyclohepta-2,4,6-trienyl)- phosphane, P(C₇H₇)₃, as a Tripodal Tetradentate Ligand in Cationic, Five-coordinate Complexes of Platinum(II) and Palladium(II)