Published by De Gruyter

Volume 57 Issue 6

Issue of Zeitschrift für Naturforschung B

Contents
Journal Overview

June 2, 2014

Neue Oxopnictate A^I₃M^VO₄: Darstellung und Kristallstruktur von A₃AsO₄ (A = K, Rb, Cs) und K₃BiO₄ / New Oxopnictates A^I₃M^VO₄: Synthesis and Crystal Structure of A₃AsO₄ (A = K, Rb, Cs) and K₃BiO₄

Franziska Emmerling, Mamdouh Idilbi, Caroline Röhr

Page range: 599-604

Abstract

The title compounds have been synthesized via oxidation of the elemental pnicogenes (M = As, Bi) with the hyperoxides AO 2 (A = K, Rb, Cs) and their crystal structures were determined on the basis of single crystal X-ray data. In K 3 AsO 4 (orthorhombic, Cccm, a = 1060:1(1), b = 1135:2(1), c = 1694:0(2) pm, Z = 16) and Cs 3 AsO 4 (orthorhombic, Pnma, a = 1254:3(2), b = 902:9(2), c = 658:5(3) pm, Z = 4) isolated tetrahedra [AsO 4 ] 3- with distances As-O between 167.0 and 170.5 pm are present, which are arranged in a nearly cubic close packing. The structure of K 3 BiO 4 (triclinic, P1̄, a = 643:18(6), b = 657:27(6), c = 762:41(7) pm, α = 101:724(2)°, β = 96:472(2)°, γ = 105:465(2)°, Z = 2) contains centrosymmetric dimers [O 3 BiO 2 BiO 3 ] 6- , in which the Bi(V) atoms are surrounded by five O atoms in a distorted trigonal bipyramidal geometry with distances Bi-O in the range of 199.5 to 233.1 pm.

June 2, 2014

Gold(I) Carboxylates and Fluorocarboxylates

Patric Römbke, Annette Schier, Hubert Schmidbaur

Page range: 605-609

Abstract

Keywords (Triphenylphosphine)gold(I) pivalate (1), and (triphenylphosphine)gold(I), [tri(p-tolyl)-phosphine]gold(I), [(4-dimethylaminophenyl)diphenylphosphine]gold(I), and (cyclohexylisocyanide) gold(I) pentafluoropropionate (2 -5) have been prepared from the corresponding gold(I) halide complexes and silver carboxylates in high yields. The products are stable to air and moisture and soluble in most common polar organic solvents. The structures of 1 and 3 have been determined. Owing to the bulk of the carboxylate substituents the molecules are monomers in the crystal. Compounds 1 - 4 undergo thermal decomposition in a narrow temperature range around 130°C, 5 is less stable and decomposes at 48° C.

June 2, 2014

Crystal Structure of Tetrabutylammonium Carbonyltribromoplatinate(II) [(C₄H₉)₄N][PtBr₃(CO)]

Michael Berkei, Jamie F. Bickley, Brian T. Heaton

Page range: 610-614

Abstract

Tetrabutylammonium carbonyltribromoplatinate(II) [(C 4 H 9 ) 4 N][PtBr 3 (CO)] crystallises in the monoclinic system in the space group P2 1 /n with a = 1487.84(13), b = 897.41(8), c = 1849.6(2) pm, β = 106.558(2)° and four formula units per unit cell. The [PtBr 3 (CO)] - anion is symmetrical (C 2v ) and almost planar with Pt-Br bond lengths of 242.40(12) pm (trans to CO), 243.25(10) pm and 242.99(9) pm (trans to Br), and a Pt-C bond length of 185.6(11) pm.

June 2, 2014

Die Koordination des [Hg₂]²⁺-Kations in der konjugierten Supersäure HF/SbF₅ durch CO oder H₂O: Kristallstruktur von [Hg₂(OH₂)₂][SbF₆]₂ · 4HF / The Co-ordination of the [Hg₂]²⁺ Cation with CO or H₂O in the Conjugated Super Acid HF/SbF₅:Cryst al Structure of [Hg₂ (OH₂)₂][SbF₆]₂ · 4HF

Michael Berkei, Markus Schürmanna, Eduard Bernhardt, Helge Willner

Page range: 615-620

Abstract

In the superacidic system HF/SbF 5 , the salt [Hg 2 (CO) 2 ][Sb 2 F 11 ] 2 reacts with traces of water to give the novel salt bis(aqua)dimercury(I) bis(hexafluoroantimonate)tetra(hydrogenfluoride) solvate [Hg 2 (OH 2 ) 2 ][SbF 6 ] 2 · 4HF. It crystallises in the triclinic system in the space group P1̄ with a = 661.47(6), b = 695.11(7), c = 922.29(9) pm, α = 83.428(5)°, β = 84.186(6)°, γ = 71.696(5)°, and one formula unit per unit cell. The four heavy atoms of the [Hg 2 (OH 2 ) 2 ] 2 + cation are linked symmetrically and almost linear (nearly C 2h ) with a Hg-Hg bond length of 249.17(11) pm, two terminal Hg-O bonds of 214.8(8) pm, and an O-Hg-Hg bond angle of 177.6(3)°. Final R indices [I > 2σ(I)] are R 1 = 0.0405 and wR 2 = 0.0714.

June 2, 2014

Synthesis and Characterization of Tetraphenylphosphonium Tetraazidoborate

Wolfgang Fraenk, Heinrich Nöth, Thomas M. Klapötke, Max Suter

Page range: 621-624

Abstract

Tetraphenylphosphonium tetraazidoborate, [P(C 6 H 5 ) 4 ][B(N 3 ) 4 ], was obtained from B(N 3 ) 3 - in situ prepared from BH 3 · O(C 2 H 5 ) 2 and HN 3 - and [P(C 6 H 5 ) 4 ][N 3 ]. Recrystallization from an acetonitrile / hexane mixture yielded colorless crystals in 60% yield. The molecular structurewas determined by single crystal X-ray diffraction and the [B(N 3 ) 4 ] - anionwas shown to possess S 4 symmetry.

June 2, 2014

Two Hydroxo Bridged Dinuclear Lanthanide Phen Complexes: [Ln₂(phen)₄(H₂O)4(OH)₂](phen)₂(NO₃)₄ with Ln = Tm, Yb

Dan-Yi Wei, Yue-Qing Zheng, Jian-Li Lin

Page range: 625-630

Abstract

Two isostructural hydroxo bridged dinuclear lanthanide phen complexes of general composition [Ln 2 (phen) 4 (H 2 O) 4 (OH) 2 ](phen) 2 (NO 3 ) 4 with Ln = Tm (1), Yb (2) were prepared by reactions of the corresponding lanthanide nitrate and phenanthroline monohydrate in CH 3 OH/H 2 O at pH = 5.5. They crystallize in the triclinic space group P1̄ (no. 2) with the cell dimensions: a = 11.233(1), b = 11.456(1), c = 14.011(2) Å , α = 93.91(1)°, β = 98.20(1)°, γ = 108.21(1)°, V = 1683.0(3)Å 3 , Z = 1 for 1 and a = 11.236(1), b = 11.480(2), c = 13.986(2)Å , α = 93.91(1)°, β = 98.17(1)°, γ = 108.33(1)°, V = 1682.9(3) Å 3 , Z = 1 for 2. The crystal structures are composed of the hydroxo bridged dinuclear [Ln 2 (phen) 4 (H 2 O) 4 (OH) 4 ] 4+ complex cations, hydrogen bonded NO 3 - anions and π-π stacking (phen) 2 dimers. The lanthanide atoms are each surrounded by two phen ligands, two H 2 O molecules and two μ-OH groups to complete a tetragonal antiprismatic LnN 4 O 4 coordination. Via two common μ-OH groups, two neighboring tetragonal antiprisms are condensed to form a centrosymmetric dinuclear [Ln 2 (phen) 4 (H 2 O) 4 (OH) 4 ] 4+ complex cation. The complex cations and (phen) 2 dimers are assembled via π-π stacking interactions and hydrogen bondings into 2D layers parallel to (101̄), between which the hydrogen bonded NO 3 - anions are sandwiched. The Tm compound shows paramagnetic behavior with an experimental magnetic moment of 7.51 μ B at room temperature. No magnetic ordering is evident down to 5 K. Over the temperature range 70 - 300 K, the Yb compound obeys the Curie-Weiss law with an experimental magnetic moment of 4.32 μ B at room temperature and shows weak ferrimagnetic behavior at low temperature.

June 2, 2014

Zur Alkylierung von 2,3-Dihydro-1,3-diisopropyl-4,5- dimethylimidazol-2-yliden [1] / On the Alkylation of 2,3-Dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene [1]

Norbert Kuhn, Martin Göhner, Manfred Steimann

Page range: 631-636

Abstract

The reaction of 2,3-dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (7, Im) and alkyl iodides has been investigated. With MeI, 7 forms a 1/1 mixture of [ImH]I (10) and [ImEt]I (11a) while from the reaction of 7 with EtI an 1/1/1 mixture of 10, 11a and [ImCH(Me)Et]I (11b) is obtained. The mechanism of the reactions is discussed, and the crystal structures of 10 and 11a are reported.

June 2, 2014

Hetero-Diels-Alder Reactions of Enaminothione with Electrophilic Olefins. Synthesis of 2-Furyl Substituted 2H-Thiopyrans

Krystyna Bogdanowicz-Szwed, Artur Budzowski

Page range: 637-644

Abstract

The hetero-Diels-Alder reaction of 1-(2-furyl)-3-(dimethylamino)-2-propene-1-thione (diene) with maleic and fumaric acids, and β-nitrostyrenes yielded 3,4-dihydro-2H-thiopyran derivatives. Treatment of some of those cycloadducts with acetic acid caused elimination of dimethylamine yielding stable 2H-thiopyrans. Reaction of the diene with maleic anhydride furnished a cycloadduct which underwent spontaneous rearrangement to form an N,N-dimethylamide derivative. Cycloadditions of the diene to maleimide, N-phenylmaleimide, diethyl maleate, fumarate and butenolide, carried out in the presence of acetic anhydride,were followed by elimination of dimethylamine, afforded stable 2H-thiopyran derivatives.

June 2, 2014

Preparation, Structure and Optical Properties of [CH₃SC(NH₂)₂]₃SnI₅, [CH₃SC(NH₂)₂][HSC(NH₂)₂]SnBr₄, (CH₃C₅H₄NCH₃)PbBr₃, and [C₆H₅CH₂SC(NH₂)₂]₄Pb₃I₁₀

C. P. Raptopoulou, A. Terzis, G. A. Mousdis, G. C. Papavassiliou

Page range: 645-650

Abstract

The preparation, crystal structure and optical absorption spectra of [CH 3 SC(NH 2 ) 2 ] 3 SnI 5 (1), [CH 3 SC(NH 2 ) 2 ][HSC(NH 2 ) 2 ]SnBr 4 (2), (CH 3 C 5 H 4 NCH 3 )PbBr 3 (3), and [C 6 H 5 CH 2 SC-(NH 2 ) 2 ] 4 Pb 3 I 10 (4) are reported. The compounds 1, 2, 3 consist of MX 6 -octahedra (M = Sn, Pb, X = I, Br) forming one-dimensional single chains (compounds 1, 3) or double chains (compound 2). The compound 4 forms a two-dimensional inorganic network via corner sharing of three face sharing octahedral units. Because of their low-dimensional character, a blue shift of the excitonic absorption bands, in comparison to those of higher dimensionality systems, is observed.

June 2, 2014

Crystal Structure and Conformation of N-(5-Chlorosalicylidene)- 2-hydroxy-5-chloroaniline

Yalçün Elerman, Mehmet Kabak, Ayhan Elmali

Page range: 651-656

Abstract

N-(5-Chlorosalicylidene)-2-hydroxy-5-chloroaniline was synthesized and its crystal structure determined. It crystallizes in the orthorhombic space group Pna2 1 with a = 14.668(4), b = 6.084(3), c = 27.980(4) Å , R = 0.051 for 4788 independent reflections). There are two independent nearly planar molecules in the asymmetric unit. The intramolecular hydrogen bonds occur between the pairs of atoms N1 and O1 [2.553(6) Å], N1 and O2 [2.585(5) Å], N2 and O3 [2.567(6) Å], N2 and O4 [2.620(5) Å], the hydrogen atoms essentially being bonded to the nitrogen atoms. The neighboring molecules are linked via an intermolecular O-H···O hydrogen bond [2.557(5) Å ]. Conformations of the title compound were investigated by semi-empirical quantum mechanical AM1 calculations. The optimized geometry of the molecular structure corresponding to the nearly planar conformation is the most stable conformation in the calculations. The results strongly indicate that the minimum energy conformation is primarily determined by non-bonded steric interactions.

June 2, 2014

Crystal Structure and Vibrational Behaviour of Tetraaqua-di(nicotinamide)M(II)-Saccharinates, with M(II) = Co, Ni, Zn

Eduardo E. Castellano, Oscar E. Piro, Beatriz S. Parajón-Costa, Enrique J. Baran

Page range: 657-660

Abstract

The crystal structures of [M(nic) 2 (H2O) 4 ](sac) 2 (nic = nocotinamide; sac = saccharinate anion) with M = Co(II), Ni(II) and Zn(II), have been determined at 116 K by single-crystal X-ray diffractometry. The compounds crystallize in the triclinic space group P1̅ with Z = 1, and the M(II) cations present a slightly distorted MN 2 O 4 octahedral environment, with equatorially coordinated water molecules and axially pyridine N-bound nicotinamide ligands. The saccharinate anions act as counteranions, and are not part of the first coordination sphere. Some comparisons with related structures have been made and the most important features of their IR spectra discussed.

June 2, 2014

Thermochemische Untersuchungen zu den Systemen SE₂O₃-SeO₂ IV. Lösungskalorimetrie der SE₂Se_xO_3+2x-Phasen (SE = Nd, Sm, Y) / Thermochemical Investigations on the Systems RE₂O₃-SeO₂ IV. Solution Calorimetry of the Phases RE₂Se_xO_3+2x(RE =Nd, Sm, Y)

M. Zhang-Preße, H. Oppermann

Page range: 661-667

Abstract

The solution enthalpies have been determined for the ternary phases RE 2 Se x O 3+2x existing on the pseudo-binary section RE 2 O 3 -SeO 2 and for RE 2 O 3 and SeO 2 in 4n HCl (RE =Nd, Sm, Y). From these date the enthalpies of formation of the ternary phases have been derived via suitable solution schemes on the basis of the known enthalpies of formation of RE 2 O 3 and SeO 2 .

June 2, 2014

γ-Oxo Carboxylic Acids in Heterocyclic Synthesis, III. Synthesis of Biologically Active 4-Benzylamino-6-(5,5-dioxodibenzothiophen- 2-yl)-2,3,4,5-tetrahydropyridazin-3-ones

Ashraf A. F. Wasfy, Mohamed M. H. Arief, Mahassen S. Amine, Shafey G. Donia, Aly A. Aly

Page range: 668-676

Abstract

α-Benzylamino-β-(5,5-dioxodibenzothiophen-2-carbonyl)propionic acid (1) has been synthesized by treating the corresponding β-aroylacrylic acid with benzylamine in dry benzene. On treatment with hydrazine hydrate the keto acid 1 furnishes the corresponding pyridazinone derivative 2. The behaviour of 2 towards carbon electrophiles, namely, ethyl chloroacetate, acrylonitrile, formaldehyde and secondary amines (under Mannich reaction conditions), aromatic aldehydes and carbon nucleophiles, namely, POCl 3 /PCl 3 and P 2 S 5 has been investigated. The 3-chloropyridazine derivative 13 reacts with hydrazine hydrate to give the 3-hydrazino derivative 14. On treatment with ethyl acetoacetate and/or acetylacetone the hydrazine 14 undergoes cyclization to afford pyrazolone derivative 16 and 3-(3,5-dimethylpyrazol- 1-yl)pyridazine derivative 17, respectively. On reaction with acetylhydrazine in boiling butanol and/or sodium azide in DMF the 3-chloropyridazine derivative 13 affords the triazolo[4,3-b]pyridazine 18 and the tetrazolo[1,5-b]pyridazine 19, respectively. The anti-microbial activity of the synthesized derivatives has been investigated.

June 2, 2014

Novel Nitronyl Nitroxides: Synthesis and Properties

Stefan Greve, Volkmar Vill, Willy Friedrichsen

Page range: 677-684

Abstract

The synthesis of several new nitronyl nitroxides with mesogenic groups is reported (6a, b, 11, 14a, b). Microscopic investigations revealed that in some cases (6b, 14b) highly ordered mesogenic phases are formed.

June 2, 2014

Synthesis, Spectroscopic Studies, Crystal Structure and Conformation Analysis of N-(2-Fluoro-3-methoxy)-salicylaldimine

H. Ünver, E. Kendi, K. Güven, T. Nuri Durlu

Page range: 685-690

Abstract

The new Schiff base ligand N-(2-fluoro-3-methoxy)-salicylaldimine (C 14 H 12 NO 2 F) (1) has been synthesised and studied by using, IR, 1 H NMR, 13 C NMR, UV-visible, GC-MS techniques, X-ray structure analysis and AM1 semi-empirical quantum mechanical methods. Compound 1 crystallises in the orthorhombic space group P2 1 2 1 2 1 with a =12.5461(1), b =18.0495(1), c =5.2615(1) Å . An intramolecular hydrogen bond connects O1 and N1 [2.575(2)Å], the hydrogen atom being bonded essentially to the oxygen atom. Minimum energy conformations were calculated as a function of two torsion angles θ 1 (C6-C7-C8-N1) and θ 2 (C7-C8-N1-C9), varied every 10 degrees. The optimized geometry of the crystal structure corresponding to the non-planar conformation is the most stable conformation in all calculations. The results strongly indicate that the minimum energy conformation is primarily determined by hydrogen-hydrogen repulsions between the ortho-hydrogen atoms on the aldehyde rings. Complementary IR, 1 H NMR and UV measurements in solution and in the solid state were carried out.

June 2, 2014

Reactivity Trends in the Reaction of Alkynes with 3-Oxo-camphorsulfonylimine

A. Mafalda Santos, M. Fernanda N. N. Carvalho, Adelino M. Galvão, Armando J. L. Pombeiro

Page range: 691-698

Abstract

The regioselective addition of deprotonated alkynes (phenyl-1-propyne, propargyl ether or tetrahydropyran-protected 3-butyn-1-ol) to the imine group was identified as a competitive process to the nucleophilic addition to the keto group of (1S)-3-oxo-camphorsulfonylimine. The selectivity of the process depends on the characteristics of the nucleophile and the reaction conditions. In the case of propargyl ether it was possible to render the imine addition the main process. The structural characterization of compounds 1, 2, 6 by X-ray diffraction analysis show that the C2 - C3 bond becomes longer upon nucleophilic addition to the imine group of (1S)-3-oxo-camphorsulfonylimine. This trend is believed to favour the ring opening process that undergoes the formation of the spiro type compound 7.

June 2, 2014

A Facile One-Pot Synthesis of 1,4,7,8,9,10-Hexahydro-6H-[1]- benzothieno[2', 3', :4,5]pyrimido[1,2-b][1,2,4,5]tetrazin-6-ones

Magda A. Abdallah

Page range: 699-706

Abstract

1,4,7,8,9,10-Hexahydro-6H-[1]benzothieno[2’,3’:4,5]pyrimido[1,2-b][1,2,4,5]tetrazin-6-ones were prepared via reaction of 2,3,5,6,7,8-hexahydro-3-amino-2-thioxo[1]benzothieno[2,3-d]- pyrimidin-4(1H)-one or its 2-methylthio derivative with hydrazonoyl halides in ethanol in the presence of triethylamine. Some of the products were screened for their biological activity.

June 2, 2014

An Improved Synthesis of Nickel-bis[5,6-dihydro-1,4-dioxine- 2,3-dithiolate], Ni(edo)₂

G. C. Papavassiliou, G. A. Mousdis, G. C. Anyfandis

Page range: 707-708

Abstract

Starting from 2,3-dichloro-1,4-dioxane, the title compound was prepared by a five-step chemical procedure, instead of a eight-step procedure reported recently.

June 2, 2014

Synthesis and Electronic Spectra of (N-1-Naphthyl-ethylenediamine)- dichloroplatinum(II). Fluorescence of the Appended Naphthyl Substituent

Horst Kunkely, Arnd Vogler

Page range: 709-712

Abstract

Pt(naph-en)Cl 2 with naph-en =N-(1-naphthyl)- ethylenediamine was synthesized and spectroscopically characterized. The complex shows a fluorescence at λ max = 405 nm, which originates from the appended naphthyl substituent present as an electronically isolated chromophore.

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 6

Issue of Zeitschrift für Naturforschung B

Neue Oxopnictate AI3MVO4: Darstellung und Kristallstruktur von A3AsO4 (A = K, Rb, Cs) und K3BiO4 / New Oxopnictates AI3MVO4: Synthesis and Crystal Structure of A3AsO4 (A = K, Rb, Cs) and K3BiO4

Abstract

Gold(I) Carboxylates and Fluorocarboxylates

Abstract

Crystal Structure of Tetrabutylammonium Carbonyltribromoplatinate(II) [(C4H9)4N][PtBr3(CO)]

Abstract

Die Koordination des [Hg2]2+-Kations in der konjugierten Supersäure HF/SbF5 durch CO oder H2O: Kristallstruktur von [Hg2(OH2)2][SbF6]2 · 4HF / The Co-ordination of the [Hg2]2+ Cation with CO or H2O in the Conjugated Super Acid HF/SbF5:Cryst al Structure of [Hg2 (OH2)2][SbF6]2 · 4HF

Abstract

Synthesis and Characterization of Tetraphenylphosphonium Tetraazidoborate

Abstract

Two Hydroxo Bridged Dinuclear Lanthanide Phen Complexes: [Ln2(phen)4(H2O)4(OH)2](phen)2(NO3)4 with Ln = Tm, Yb

Abstract

Zur Alkylierung von 2,3-Dihydro-1,3-diisopropyl-4,5- dimethylimidazol-2-yliden [1] / On the Alkylation of 2,3-Dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene [1]

Abstract

Hetero-Diels-Alder Reactions of Enaminothione with Electrophilic Olefins. Synthesis of 2-Furyl Substituted 2H-Thiopyrans

Abstract

Preparation, Structure and Optical Properties of [CH3SC(NH2)2]3SnI5, [CH3SC(NH2)2][HSC(NH2)2]SnBr4, (CH3C5H4NCH3)PbBr3, and [C6H5CH2SC(NH2)2]4Pb3I10

Abstract

Crystal Structure and Conformation of N-(5-Chlorosalicylidene)- 2-hydroxy-5-chloroaniline

Abstract

Crystal Structure and Vibrational Behaviour of Tetraaqua-di(nicotinamide)M(II)-Saccharinates, with M(II) = Co, Ni, Zn

Abstract

Thermochemische Untersuchungen zu den Systemen SE2O3-SeO2 IV. Lösungskalorimetrie der SE2SexO3+2x-Phasen (SE = Nd, Sm, Y) / Thermochemical Investigations on the Systems RE2O3-SeO2 IV. Solution Calorimetry of the Phases RE2SexO3+2x(RE =Nd, Sm, Y)

Abstract

γ-Oxo Carboxylic Acids in Heterocyclic Synthesis, III. Synthesis of Biologically Active 4-Benzylamino-6-(5,5-dioxodibenzothiophen- 2-yl)-2,3,4,5-tetrahydropyridazin-3-ones

Abstract

Novel Nitronyl Nitroxides: Synthesis and Properties

Abstract

Synthesis, Spectroscopic Studies, Crystal Structure and Conformation Analysis of N-(2-Fluoro-3-methoxy)-salicylaldimine

Abstract

Reactivity Trends in the Reaction of Alkynes with 3-Oxo-camphorsulfonylimine

Abstract

A Facile One-Pot Synthesis of 1,4,7,8,9,10-Hexahydro-6H-[1]- benzothieno[2', 3', :4,5]pyrimido[1,2-b][1,2,4,5]tetrazin-6-ones

Abstract

An Improved Synthesis of Nickel-bis[5,6-dihydro-1,4-dioxine- 2,3-dithiolate], Ni(edo)2

Abstract

Synthesis and Electronic Spectra of (N-1-Naphthyl-ethylenediamine)- dichloroplatinum(II). Fluorescence of the Appended Naphthyl Substituent

Abstract

Neue Oxopnictate A^I₃M^VO₄: Darstellung und Kristallstruktur von A₃AsO₄ (A = K, Rb, Cs) und K₃BiO₄ / New Oxopnictates A^I₃M^VO₄: Synthesis and Crystal Structure of A₃AsO₄ (A = K, Rb, Cs) and K₃BiO₄

Crystal Structure of Tetrabutylammonium Carbonyltribromoplatinate(II) [(C₄H₉)₄N][PtBr₃(CO)]

Two Hydroxo Bridged Dinuclear Lanthanide Phen Complexes: [Ln₂(phen)₄(H₂O)4(OH)₂](phen)₂(NO₃)₄ with Ln = Tm, Yb

Preparation, Structure and Optical Properties of [CH₃SC(NH₂)₂]₃SnI₅, [CH₃SC(NH₂)₂][HSC(NH₂)₂]SnBr₄, (CH₃C₅H₄NCH₃)PbBr₃, and [C₆H₅CH₂SC(NH₂)₂]₄Pb₃I₁₀

Thermochemische Untersuchungen zu den Systemen SE₂O₃-SeO₂ IV. Lösungskalorimetrie der SE₂Se_xO_3+2x-Phasen (SE = Nd, Sm, Y) / Thermochemical Investigations on the Systems RE₂O₃-SeO₂ IV. Solution Calorimetry of the Phases RE₂Se_xO_3+2x(RE =Nd, Sm, Y)

An Improved Synthesis of Nickel-bis[5,6-dihydro-1,4-dioxine- 2,3-dithiolate], Ni(edo)₂