| 202 | Author
| Dieter Weber | Requires cookie* | | Title
| CHsNHsSnBraJa-z = 0-3), a Sn(II)-System with Cubic Perovskite Structure  | | | Abstract
| CH3NH3SnBr^l3 -.x [x = 0—3) has the cubic perovskite structure with the unit cell parameters a = 5.89 A {x = 3), a = 6.01 A (x = 2) and a = 6.24 A (x = 0) and Z = 1. The compounds show intense colour and conducting property. The U9 Sn Mössbauer data are consistent with the high symmetry environment of the Sn(II)-ion. A bonding model, using a "p-resonance-bonding", can explain the properties of the cubic system. The synthesis is described. | | |
Reference
| Z. Naturforsch. 33b, 862—865 (1978); eingegangen am 5. Mai 1978 | | |
Published
| 1978 | | |
Keywords
| Synthesis, X-ray, Mössbauer Spectra | | |
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| default:Reihe_B/33/ZNB-1978-33b-0862.pdf | | | Identifier
| ZNB-1978-33b-0862 | | | Volume
| 33 | |
203 | Author
| Johanna Von Unterrichter, Klaus-Jürgen Range | Requires cookie* | | Title
| Ag8GeTe6, ein Vertreter der Argyroditfamilie AgsGeTe6, a Representative of the Argyrodite Family  | | | Abstract
| A single crystal of AgsGeTe6 was found to be rhombohedral, pseudocubic, space group R3m, with a— 817.6 pm, a — 60° and Z — 1. The anion lattice consists of three-dimen-sionally connected Frank-Kasper polyhedra with C. N. 12 and 16. The structure comprises isolated GeTe4-tetrahedra and silver ions, statistically distributed over a number of sites with distorted tetrahedral, trigonal and linear co-ordination. Structural data for some other compounds of the argyrodite family are given. | | |
Reference
| Z. Naturforsch. 33b, 866—872 (1978); eingegangen am 2. Mai 1978 | | |
Published
| 1978 | | |
Keywords
| Silver Germanium Telluride, Crystal Structure, Argyrodite Family | | |
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| default:Reihe_B/33/ZNB-1978-33b-0866.pdf | | | Identifier
| ZNB-1978-33b-0866 | | | Volume
| 33 | |
205 | Author
| Werner Buchholz, Hans-Uwe Schuster | Requires cookie* | | Title
| Die Verbindungen MgFe6Ge6 und LiCo6Ge6 The Compounds MgFeßGee and LiCoöGee  | | | Abstract
| The hexagonally crystallizing compounds MgFeeGeß and LiCoeGeß were prepared and structurally characterized by single crystal investigations. The lattice constants are a = 506.7 pm, c — 804.5 pm, c/a—1.58s for MgFe6Ge6 and a = 504.8 pm, c = 772.9 pm, c/a = 1.53i for LiCoßGee. The structures (space group P6/mmm) are closely related to the structure of LiFeeGe6 and the B35-type structure of FeGe. | | |
Reference
| Z. Naturforsch. 33b, 877—880 (1978); eingegangen am 26. Mai 1978 | | |
Published
| 1978 | | |
Keywords
| Ternary Germanium Compounds, Magnesium, Iron, Lithium, Cobalt, Crystal Structure | | |
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| default:Reihe_B/33/ZNB-1978-33b-0877.pdf | | | Identifier
| ZNB-1978-33b-0877 | | | Volume
| 33 | |
206 | Author
| Wolfgang May, Hans Georg Von Schnering | Requires cookie* | | Title
| Darstellung und Struktur des Bicyclo-[4.4.0]-1.4.6.9-tetraazadecans C6H14N4  | | | Abstract
| By the weak acid interaction of polymeric phosphanes the condensation of ethylendi-amine yields in a small amount bicyclo-[4,4,0]-l,4,6,9-tetraazadecane C6H14N4. The compound crystallizes triclinic in the space group PI with a = 841.6 pm, b — 463.6 pm, c = 529.2 pm, a= 109.05°, ß= 108.35°, y = 84.13° and Z= 1 formula unit per unit cell. The two condensed six-membered rings have chair conformations. The mean N-C bond lengths are 146.0 pm, the bridging C-C bond is 150.3 pm, whereas the other C-C bonds are 155.1 pm. Structure and condensation reaction are discussed. | | |
Reference
| Z. Naturforsch. 33b, 881—883 (1978); eingegangen am 17. Mai 1978 | | |
Published
| 1978 | | |
Keywords
| Tetraaza-bicyclo-decane, Preparation, Crystal Structure | | |
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| default:Reihe_B/33/ZNB-1978-33b-0881.pdf | | | Identifier
| ZNB-1978-33b-0881 | | | Volume
| 33 | |
207 | Author
| Hartmut Hibst, Reginald Gruehn | Requires cookie* | | Title
| Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, VII a Ein neuer einfacher Weg zur Berechnung von [(0,F)/Me]-Werten bei Blockstrukturen Contributions to the Study of Inorganic Non-Stoichiometric Compounds, VII a A New Simple Method to Calculate Values of [(0,F)/Me] for Block Structures  | | | Abstract
| A simple, quick and reliable method is derived to calculate values of [(0,F)/Me] for block structures. The method of calculation is exemplified using ideal and real (defect) block structures and inconsistent published data. The method represents a simple means to systematically classify block structures. | | |
Reference
| Z. Naturforsch. 33b, 884—890 (1978); eingegangen am 13. Februar/12. Juni 1978 | | |
Published
| 1978 | | |
Keywords
| Block Structures, Crystal Structures, Defect Structures, High Resolution Electron Microscopy | | |
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| default:Reihe_B/33/ZNB-1978-33b-0884.pdf | | | Identifier
| ZNB-1978-33b-0884 | | | Volume
| 33 | |
208 | Author
| Anton Meiler, Walter Maringgele, Klaus-Dieter Kablau, R3b @bullet, R. —n=c 'r, B. R. N=c | Requires cookie* | | Title
| Umsetzungen von Metall-und Metalloidverbindungen mit mehrfunktionellen Molekülen, XVIII [1] Synthese von Amidinoborazinen Reactions of Metal and Metalloid Compounds with Polyfunctional Molecules, XVIII [1] Synthesis of Amidinoborazines  | | | Abstract
| The reaction of trimethylsilylamidines with 2-chloro-l,3,4,5,6-pentamethylborazine leads to the corresponding amidinoborazines and chlorotrimethylsilane. 1 H, 11 B, n F NMR spectra, mass spectra and characteristic IR group frequencies are reported. Umsetzungen von Trialkylboranen mit Amidinen ergeben nach Die Si-N-Bindung wird durch Halogenborane meist unter milden Bedingungen nach | | |
Reference
| Z. Naturforsch. 33b, 891—895 (1978); eingegangen am 5. Mai 1978 | | |
Published
| 1978 | | |
Keywords
| Chloroborazines, Silylamidines, Amidinoborazines, NMR | | |
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| default:Reihe_B/33/ZNB-1978-33b-0891.pdf | | | Identifier
| ZNB-1978-33b-0891 | | | Volume
| 33 | |
210 | Author
| Wolfgang Malisch, Peter Panster, Robert Alsmann | Requires cookie* | | Title
| Transition Metal Substituted VB Element Systems, 12 [1] Mono-and Dinuclear Transition Metal Complexes with Dihalogenarsenic Groups  | | | Abstract
| The reaction of ASCI3 with the transition metal anions [r^-CsHstCO^M] 9 (M = Cr, Mo, W) yields the arsenic transition metal complexes -C5H5(CO)3M-AsCl2, which readily form Jrans-77 5 -C5H5(CO)2LM-AsCl2 in the presence of phosphorus donors [L = P(OCH3)3, P(CH3)2C6H5]. Addition of M(CO)s-groups on the trivalent arsenic occurs with THF • M'(CO)s (M' = Cr, Mo) leading to the arsenic bridged dinuclear complexes ^-CsHstCO^Cr-AsC^M^CO^. Controlled Cl/F-exchange at the bridged species can be achieved by use of AgBF4. | | |
Reference
| Z. Naturforsch. 33b, 899—905 (1978); eingegangen am 21. Juni 1978 | | |
Published
| 1978 | | |
Keywords
| Arsenic Transition Metal Complexes, Ligand Exchange, Dinuclear Complexes | | |
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| default:Reihe_B/33/ZNB-1978-33b-0899.pdf | | | Identifier
| ZNB-1978-33b-0899 | | | Volume
| 33 | |
211 | Author
| M. M. Aly | Requires cookie* | | Title
| The Isolation and Characterization of Square Planar, Square Pyramidal, and Octahedral Copper(II) Complexes with Mixed Ligands  | | | Abstract
| Copper(II) Complexes, Mixed Ligands Substitution of an acetylacetonate by a carboxylate in the neutral (acac)2Cu(II) was achieved by its reaction with tri-and dichloroacetic acid in benzene (HCO2R where R = CCI3 or CHCI2; Hacac = acetylacetone) which led to the formation of the mixed chelate square planar complex (acac)Cu(OCOR). The later complex, R = CCI3, reacted with heterocyclic bases to produce the square pyramidal complexes (acac)Cu(OCOR) (base), (base = 2-methylpyridine or quinoline); with ethylenediamine (en) to give the octahedral [(en)2Cu(OCOR)]Cl, and with methanol and piperidine or boiling methanol alone to give the methoxo-bridged (acac)Cu(OCH3)2Cu(acac). The reaction of acetylacetonate-carboxy-late-copper(II) complex (R = CHCI2) with heterocyclic bases led to the cleavage of the acetylacetonate ligand and the formation of the octahedral Cu(OCOCHCl2) • 2 base (base = pyridine, 2-, 3-or 4-methylpyridine). The same cleavage reaction took place, and also with R = CCI3, in their reaction with 8-hydroxyquinoline to form the mixed chelates (ROCO)Cu(Oxinate). These formulations are based on chemical analyses, electronic and vibrational spectra, and on conductance measurements. | | |
Reference
| Z. Naturforsch. 33b, 906—910 (1978); received March 22/April 27 1978 | | |
Published
| 1978 | | |
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| default:Reihe_B/33/ZNB-1978-33b-0906.pdf | | | Identifier
| ZNB-1978-33b-0906 | | | Volume
| 33 | |
214 | Author
| Heinz Falk, Karl Grubmayr, Klaus Thirring | Requires cookie* | | Title
| Beiträge zur Chemie der Pyrrolpigmente, XXIII [1] Die Struktur eines Bilatrien-abc-Derivates im gelösten Zustande On the Chemistry of Pyrrole Pigments, XXIII [1] The Structure of a Bilatriene-abc Derivative in the State of Solution  | | | Abstract
| The (Z,Z,Z)-configuration of the mono-lactim-ether of an alkyl substituted bilatriene-abc, Etiobiliverdin-IV-y, was established for chloroform solutions. Moreover the confor-mation of this molecule is a helical one (syn-syn-syn) with a twist along the single bonds at the methine groups of approximately 20°. The two tautomeric lactam-forms with a proton on one or the other nitrogen atom of the pyrromethene subsystem are indistin-guishable by the methods used in this investigation: *H NMR pattern, Lanthanide induced shift technique and Nuclear Overhauser Effect measurements. | | |
Reference
| Z. Naturforsch. 33b, 924—931 (1978); eingegangen am 30. Januar 1978 | | |
Published
| 1978 | | |
Keywords
| *H NMR, Lanthanide Shifts, Configuration, Conformation, Tautomeric Equilibrium | | |
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| default:Reihe_B/33/ZNB-1978-33b-0924.pdf | | | Identifier
| ZNB-1978-33b-0924 | | | Volume
| 33 | |
216 | Author
| A.F A Shalaby, H. A. Daboun, M.A Abdel Aziz | Requires cookie* | | Title
| Novel Rearrangement of 5-Arylazo-2-thiohydantoin Derivatives with Alkali and Aromatic Amines  | | | Abstract
| 2-Thiohydantoin Derivatives, Alkali Amines, Aromatic Amines 5-Arylazo-2-thiohydantoin derivatives (2a,c) were cleaved and rearranged by aqueous sodium hydroxide to give the corresponding l-aryl-Zl 2 -l,2,4-trazole-5-imino-3-carboxylic acids (3a-c). 3 a was decarboxylated to 1-phenyl-Zl 2 -1,2,4-triazoline-5-imine (o). Hydrolysis of 5-arylazo-l-phenyl-2-thiohydantoins (6a-c) behaved in different manner affording l-aryl-4-phenyl-zl 2 -l,2,4-triazoline-5-thione-3-carboxylic acids (7a-c). Fusing (2a-c) with aromatic amines at high temperature gave the corresponding anilides (8a-h). Treatment of 5-arylidene-2-thiohydantoin derivatives (9a-c) with hydrazine hydrate gave colourless products of thioureido cinnamic acid hydrazide derivatives (lOa-c), while refluxing ö-arylidene-2-methylmercaptohydantoin (lla-d) with hydrazine hydrate and/or benzo-phenone hydrazone gave the corresponding glycocyamidine derivatives (12a-g). | | |
Reference
| Z. Naturforsch. 33b, 937—941 (1978); received March 16 1978 | | |
Published
| 1978 | | |
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| default:Reihe_B/33/ZNB-1978-33b-0937.pdf | | | Identifier
| ZNB-1978-33b-0937 | | | Volume
| 33 | |
217 | Author
| Heinz-Peter Schuchmann, Peter Naderwitz, Clemens Von Sonntag | Requires cookie* | | Title
| Photolysis (A 185 nm) of Liquid Tetrahydropyran  | | | Abstract
| The main products of the 185 nm photolysis of neat liquid tetrahydropyran are pent-4-en-l-ol (7) (0 = 0.40), 2-(5'-hydroxypentyl)tetrahydropyran (10) (0.21), valeraldehyde (6) (0.13), and pentan-l-ol (8) (0.08). These products are thought to be formed via the bi-radical '0(0112)40112, and/or through intramolecular (6, 7, 8) and intermolecular (10) photoreactions. In the case of 10, the probability of a specific intermolecular photoreaction involving two tetrahydropyran molecules is suggested by the fact that in the photolysis of solutions of tetrahydropyran in cyclohexane and formaldehyde dimethyl acetal products analogous to 10 made up of a tetrahydropyran and a solvent molecule moiety, are not formed. | | |
Reference
| Z. Naturforsch. 33b, 942—945 (1978); received April 28 1978 | | |
Published
| 1978 | | |
Keywords
| Photolysis, Tetrahydropyran, Quantum Yields, Biradical Intermediates, Photodimer | | |
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| default:Reihe_B/33/ZNB-1978-33b-0942.pdf | | | Identifier
| ZNB-1978-33b-0942 | | | Volume
| 33 | |
218 | Author
| V. M. Chari, R. Klapfenberger, H. Wagner | Requires cookie* | | Title
| Synthesis of Xanthone-O-glycosides, I Synthesis of 3-0-/3-Glycosides  | | | Abstract
| Xanthone-O-glycosides, Gentioside, Synthesis The synthesis of hydroxy-xanthone-3-0-/?-glycosides by condensation of the appropriate aglycone and the acetyl-a-D-glycosyl bromide in pyridine solution in presence of silver carbonate is described. The naturally occurring l-hydroxy-3-0-/?-primeverosyl-7-methoxy xanthone (gentioside) has been synthesized and its structure thereby confirmed. | | |
Reference
| Z. Naturforsch. 33b, 946—949 (1978); received April 17 1978 | | |
Published
| 1978 | | |
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| default:Reihe_B/33/ZNB-1978-33b-0946.pdf | | | Identifier
| ZNB-1978-33b-0946 | | | Volume
| 33 | |
220 | Author
| Strontiumchromate, K. Hartl, R. Braungart | Requires cookie* | | Title
| eine Hochtemperaturphase mit Defekt-Bariumphosphat-Struktur a High- Temperature Compound with Defect-Bariumphosphate Structure  | | | Abstract
| Black hexagonal platelets growing on stron-tiumoxide in the presence of chromium (III)-oxide and air at temperatures from 1250 to 1400 °C have been shown to belong to the rhombohedral space group R3m. In hexagonal orientation the elementary cell has the axes ao = 1115.8 i 0.9 pm and c0 = 4037 ± 3,6 pm and Z = 24, Dx — 4.26. Structurally the compound is closely related to Ba3(P04)2, with the excep-tion, that there are defects in the metal sub-lattice. At temperatures below 1200 °C Stron-tiumchromate(V, VI) decomposes into the dis-crete chromates(V) and -(VI). At temperatures from 113 to 338 K the compound is an electronic semiconductor with an activation energy of 0.26 eV. | | |
Reference
| Z. Naturforsch. 33b, 952—953 (1978); eingegangen am 1. Juni 1978 | | |
Published
| 1978 | | |
Keywords
| High-Temperature Oxochromate, Defect Structure, Mixed-Valence Oxochromate, Semiconductor | | |
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| default:Reihe_B/33/ZNB-1978-33b-0952_n.pdf | | | Identifier
| ZNB-1978-33b-0952_n | | | Volume
| 33 | |
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