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121	Author	RainerM. Attes, A. Nnegret Preuß, Kurt-Ludwig Richter	Requires cookie*
	Title	Polymere Methylphosphono-vanadate: Struktur von K[CH3P V 0 5] * H20
	Abstract	Polymeric phosphono-vanadates M^CI-^PVOs] ■ H 20 (M = K, N H 4) and the acid H [C H 3P V 0 5] • H20 have been prepared. K [CH 3P V 0 5] • H 20 crystallizes in the trigonal space group P3j21 with a = 1111.2(2) and c = 1004.0(3) pm , and consists of an open structure of corner sharing V —O-and C H 3 —P —O -polyhedra. Polyhedral chains form helices along the screw axis of the space group. The vanadium polyhedron can be described as highly distorted trigonal bi pyramid with two term inal oxygen atoms.
	Reference	Z. Naturforsch. 39b, 1331 (1984); eingegangen am 10. Mai 1984
	Published	1984
	Keywords	Organophosphono V anadates, P reparation, Crystal Structure
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	TEI-XML for	default:Reihe_B/39/ZNB-1984-39b-1331.pdf
	Identifier	ZNB-1984-39b-1331
	Volume	39

122	Author	G.Erhard Thiele, HeinzW R Otter, I. M. Br, Jochen Artin Lietz, Ellerm	Requires cookie*
	Title	Chemie polyfunktioneller Moleküle, 80 [1] Kristall-und Molekülstrukturen der Heteronoradamantane 5-Methyl
	Abstract	2.2.8.8-tetra-ethoxycarbonyI-1.3.7-triarsa-tricyclo[3.3.1.03,7]nonan und 5-Methyl-1.3.7-triarsa-2.8-diselena-tricyclo[3.3.1.03,7]nonan Chemistry of Polyfunctional M olecules, 80 [1] Crystal and M olecular Structures of the H eteronoradam antanes 5-M ethyl-2.2.8.8-tetra-ethoxycarbonyl-1.3.7-triarsa-tricyclo[3.3.1.03'7]nonane and 5-M ethyl-1.3.7-triarsa-2.8-diselena-[3.3.1.037]nonane The m olecular and crystal structures of the nor-heteroadam antanes C H 3C (C H 2A s)3[C (C O O C H ;C H 3)2]2 (1) and C H 3C (C H 2A s)3Se2 (2) have been investigated in order to obtain confirm ation of the rare structures deduced earlier from mass, 'H NM R and vibrational spectroscopy. Crystals of 1 are triclinic, space group P I —Cf with a — 769.27(30), b = 1036.09(14), c = 1599.18(17) pm , a = 98.236(10)°, ß = 97.987(18)°, y = 103.633(20)° and Z = 2. On the basis of 1821 unique reflections the structure was refined to a weighted R value of 5.28% . The crystals of 2 are monoclinic, space group P 2 ,/c—Cih with a = 1102.73(23), b — 727.49(14), c = 1281.27(42) pm . ß = 98.803(21)° and Z = 4. On the basis of 1065 unique reflections the structure was refined to a weighted R value of 5.93%. Several attem pts to synthesize C H 3C (C H :A s)3Te2 failed.
	Reference	Z. Naturforsch. 39b, 1344—1349 (1984); eingegangen am 23. März 1984
	Published	1984
	Keywords	Crystal Structures, H eteronoradam antanes, A rsenic, Selenium
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	TEI-XML for	default:Reihe_B/39/ZNB-1984-39b-1344.pdf
	Identifier	ZNB-1984-39b-1344
	Volume	39

123	Author	Ulrich Kynast, Elke Conradi, UlrichM. Üller, Kurt Dehnicke	Requires cookie*
	Title	Cyclo-thiazenokomplexe von Molybdän und Wolfram. Die Kristallstruktur von AsPh4[WCl4(N3S2)] Cyclo-thiazeno Complexes of Molybdenum and Tungsten. The Crystal Structure of A sPh4[WCl4(N 3S2)]
	Abstract	The dark brown cyclo-thiazeno com plexes [M oCl3(N 3S2)]2 and [WC13(N 3S2)]2 are obtained by
	Reference	Z. Naturforsch. 39b, 1680—1685 (1984); eingegangen am 14. Juli 1984
	Published	1984
	Keywords	Cyclo-thiazeno C om plexes, IR Spectra, Crystal Structure
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	Identifier	ZNB-1984-39b-1680
	Volume	39

124	Author	Rolf Minkwitz, Klaus Jänichen, Herbert Prenzel, Volker Wölfel	Requires cookie*
	Title	Beiträge zur Chemie der Schwefelhalogenide, 6 [1] Untersuchungen an Trichlorsulfonium(IV)-Salzen Contributions to the Chemistry of Sulfur Halides, 6 [1] Investigations on Trichlorosulfonium(IV) Salts
	Abstract	The crystal structure of SCl 3 + AsF 6 ~ is reported. The mean S-Cl stretching frequency v of the SC1 3 + cations, weighted according to the degree of degeneration, in the different SC1 3 + X~ salts is directly proportional to the mean S-Cl distance r scl , the force constant f sci and the sulfur.. .anion distance (C1 3 S + .. .X"). That SC1 3 + C1" should be isostructural with PC1 4 ~, the large variation in the S-Cl stretching frequencies in the SC1 3 + X~ salts is due to cation-anion interaction forces.
	Reference	(Z. Naturforsch. 40b, 53—56 [1985]; eingegangen am 4. Juli/10. Oktober 1984)
	Published	1985
	Keywords	Crystal Structure, Bonding and Force Constants, Sulfur Halides
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	TEI-XML for	default:Reihe_B/40/ZNB-1985-40b-0053.pdf
	Identifier	ZNB-1985-40b-0053
	Volume	40

125	Author	Manfred Regitz, Klaus Urgast, Gerhard Maas	Requires cookie*
	Title	Phosphorverbindungen ungewöhnlicher Koordination, 3 [1] Vergleich des Cycloadditonsverhaltens von Diphenylketen und Triphenylphosphen Phosphorus Compounds with Unusual Coordination, 3 [1] Comparison of the Cycloaddition Behaviour of Diphenylketene and Triphenylphosphene
	Abstract	Triphenylphosphene (3b), generated thermally or photochemically from lb, undergoes olefi-nation reaction with 4.5-benzotropone (6) to yield l-(diphenylmethylen)-4.5-benzocyclohepta-triene (9); the oxaphosphetane 7b is assumed to be the intermediate of this reaction. In an analogous way, 4-pyrone (15) is transformed into 4-(diphenylmethylen)pyrane (16). Correspon-ding olefination behaviour is observed in the reactions of 6 and 15 with diphenylketene. In the reaction of tetracyclone (20) with diphenylketene (3a), the olefination sequence leads to the formation of (diphenylmethylen)tetraphenylcyclopentadiene (21) via betain 22a and the cycloadduct 23a. The spirocyclic reaction product 26a probably arises from the same betain — like intermediate (22 a —> 25 a —> 26 a). The analogy in triphenylphosphene reactivity towards 20 is restricted to the [2+8]-cycloaddition step (formation of 26b).
	Reference	(Z. Naturforsch. 40b, 67—76 [1985]; eingegangen am 19. Juli 1984)
	Published	1985
	Keywords	Diphenylketene, Triphenylphosphene, Cycloaddition with CO-Compounds, Crystal Structure
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	TEI-XML for	default:Reihe_B/40/ZNB-1985-40b-0067.pdf
	Identifier	ZNB-1985-40b-0067
	Volume	40

126	Author	Siegfried Pohl, Wolfgang Saak, Bernt Krebs	Requires cookie*
	Title	Tetrahalogenotellurate(II): Synthese und Kristallstrukturen von Verbindungen mit den Ionen TeX 4 2- (X = CI, Br, I) Tetrahalotellurates(II): Syntheses and Crystal Structures of Compounds with TeX 4 2 ~ Ions (X = CI, Br, I)
	Abstract	The compounds [(C 6 H 5) 4 As] 2 TeCl 4 (1), [(C 2 H 5) 4 N] 2 TeBr 4 • CH 3 CN (2), and [(C 2 H 5) 4 N] 2 TeI 4 (3) were prepared by the reaction of Te, X 2 , and excess (QH^NX (X = Br, I) in acetonitrile solution or by heating of [(C 6 H 5) 4 As] 2 TeCl 6 , Te, and (C 6 H 5) 4 ASC1 for several hours in the same solvent. The structures of 1—3 were determined from single crystal X-ray data. 1 crystallizes in the monoclinic space group P2 x ln with a = 1061.8(2), b = 1614.2(3), c = 1341.7(3) pm, ß = 94.21° and Z = 2; 2: tetragonal, P4/mmm, a = 1039.7(2), c = 690.5(1), Z = 1; 3: tetragonal, 14/mmm, a = 1061.7(2), c = 1342.8(4), Z = 2. In 1-3 Te(II) exhibits a square planar coordination. The Te —CI, Te —Br, and Te—I bond lengths were found to be 260.7 (mean), 275.3, and 298.5 pm, respectively.
	Reference	Z. Naturforsch. 40b, 251—257 (1985); eingegangen am 22. Oktober 1984
	Published	1985
	Keywords	Tetrahalotellurates(II), Synthesis, Crystal Structure
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	Identifier	ZNB-1985-40b-0251
	Volume	40

127	Author	Udo Demant, Elke Conradi, Ulrich Müller, Kurt Dehnicke	Requires cookie*
	Title	Formamidinhim-Hexachloroferrat(III) Synthese und Kristallstruktur Formamidinium-Hexachloroferrate(III) Synthesis and Crystal Structure
	Abstract	[HC(NH 2) 2 ] 3 FeCl 6 was obtained together with other products from the reaction of S 4 N 4 with HCl in H 2 CC1 2 in the presence of FeCl 3 . Its crystal structure was determined from X-ray diffraction data (473 in-dependent observed reflexions, R = 0.047). Lattice constants: a = 961.6, c — 876.4 pm; tetragonal, space group P4 2 /m, Z = 2. Of the two crystallo-graphically independent formamidinium ions HC(NH 2) 2 ®, one exhibits positional disorder; the other one has C—N bond lengths of 128 pm. The FeCl 6 30 ions have symmetry C 2h , but the deviation from O h is small.
	Reference	Z. Naturforsch. 40b, 443—445 (1985); eingegangen am 6. November 1984
	Published	1985
	Keywords	Formamidinium-Hexachloroferrate(III), Synthesis, IR Spectra, Crystal Structure
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	TEI-XML for	default:Reihe_B/40/ZNB-1985-40b-0443_n.pdf
	Identifier	ZNB-1985-40b-0443_n
	Volume	40

128	Author	Heinz Hoberg, Klaus Radine, Carl Krüger, MariaJ. Romão	Requires cookie*
	Title	Synthese neuer Phosphan-Nickel(I)-KompIexe und Kristallstruktur von /# 3 Jodo-fra-^-iodo-cycIotris(triphenylphosphan-nickel), (TPP) 3 Ni 3 I 4 Synthesis of New Phosphine Nickel(I) Complexes and Crystal Structure of // 3 -Iodo-m's-//-iodo-cyclotris(triphenylphosphine Nickel), (TPP) 3 Ni 3 I 4
	Abstract	Synthesis and properties of the new nickel(I) complexes (COD)Ni(TPP)I (3) and (TCP)Nil (5) are reported. Reaction of 3 and 5 with diphenylacetylene (7) yields alkyne complexes (R 3 P)NiI(PhC2Ph)Ni(R 3 P)I (R = Ph (8a), and Cy (8b)). In solution, 3 disproportionates to give nickel(O) and (TPP) 3 Ni 3 I 4 (12)), the structure of which has been determined by X-ray crystallogra-phy. Cluster compound 12 is cleaved into monomeric units by addition of ligands such as TPP or CO (TPP = triphenylphosphine, TCP = tricyclohexylphosphine, COD = 1,5-cyclooctadiene).
	Reference	Z. Naturforsch. 40b, 607—614 (1985); eingegangen am 17. Januar 1985
	Published	1985
	Keywords	Nickel(I), Alkyne Complex, Cluster, Crystal Structure
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	Identifier	ZNB-1985-40b-0607
	Volume	40

129	Author	Ulrich Schwanitz-Schüller, Arndt Simon	Requires cookie*
	Title	Synthese und Kristallstruktur von Gd 2 NCl 3 Synthesis and Crystal Structure of Gd 2 NCl 3
	Abstract	The new compound Gd 2 NCl 3 is formed from GdCl 3 with Gd and N 2 as well as from GdCl 3 with GdN (at 1020 K). The crystal structure contains NGd 4 tetrahedra, which are linked via opposite edges to form infinite chains (Orthorhombic, Pbcn; a = 1301.7(1), b = 673.10(6), c = 614.03(7) pm; R = 0.031 for 578 independent reflections). The formal analogy with structures containing condensed clusters, e.g. Gd 2 Cl 3 , is discussed.
	Reference	Z. Naturforsch. 40b, 705—709 (1985); eingegangen am 31. Oktober 1984
	Published	1985
	Keywords	Rare Earth Nitride Chloride, Synthesis, Crystal Structure
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	TEI-XML for	default:Reihe_B/40/ZNB-1985-40b-0705.pdf
	Identifier	ZNB-1985-40b-0705
	Volume	40

130	Author	Horst Sabrowsky, Alfred Thimm, Petra Mertens	Requires cookie*
	Title	Kaliumlithiumsulfid, KLiS: Das erste Interalkalimetallsulfid Potassium Lithium Sulphide, KLiS: The First Inter Alkaline Metal Sulphide
	Abstract	The compound KLiS has been prepared and its crystal structure is determined by X-ray dif-fraction techniques. The hygroscopic, yellow compound crystallizes in the tetragonal space group P4/nmm (Z = 2) with the cell parameters a — 431.79(4), c = 696.20(9) pm. The structure was solved from 2100 counter reflections (356 symmetry independent reflections) through a Patterson synthesis and refinement by Fourier syntheses to a least squares residue of 0.026. The structure is characterized by c-centered squares of lithium layers interspersed by anti-parallel ordered K—S-pairs forming an anti-PbFCl-type geometry.
	Reference	Z. Naturforsch. 40b, 733—735 (1985); eingegangen am 8. Februar 1985
	Published	1985
	Keywords	Potassium Lithium Sulphide, Crystal Structure, X-Ray
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	TEI-XML for	default:Reihe_B/40/ZNB-1985-40b-0733.pdf
	Identifier	ZNB-1985-40b-0733
	Volume	40

131	Author	Jens Anhaus, ZafarA. Siddiqi, HerbertW. Roesky, JanW. Bats, Yalcin Elerman	Requires cookie*
	Title	Reaktion von Tetraschwefeltetranitrid mit Rhenium(VII)-chloronitrid Die Kristallstruktur von [Ph 4 As + ] 2 [Cl 4 Re(NS)(NSCl) 2_ ] * CH 2 C1 2 Reaction of Tetrasulfurtetranitride with Rhenium(VII)-chloronitride The Crystal Structure of [Ph 4 As + ] 2 [Cl 4 Re(NS)(NSCl) 2_ ] * CH 2 C1 2
	Abstract	The synthesis of [Ph 4 As + ] 2 [Cl 4 Re(NS)(NSCl) 2 ~] • CH 2 C1 2 (4) from the reaction of S 4 N 4 , Cl 4 ReN, and Ph 4 AsCl is reported. CH 2 C1 2 is used as solvent. The reaction of S 4 N 4 with Re 2 Cl 10 similarly leads to the salt [Ph 4 As + ][Cl 5 ReNS~] (5) in a smaller yield. 4 crystallizes in the triclinic space group PI with Z -2, a = 10.434(2), b = 12.1454(6), c -21.125(2) Ä, a = 81.210(6), ß = 86.70(1), Y = 76.624(8)°.
	Reference	Z. Naturforsch. 40b, 740—744 (1985); eingegangen am 6. Februar 1985
	Published	1985
	Keywords	Thionitrosyl Complexes, Rhenium(VII), Crystal Structure
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	TEI-XML for	default:Reihe_B/40/ZNB-1985-40b-0740.pdf
	Identifier	ZNB-1985-40b-0740
	Volume	40

132	Author	KurtO. Klepp	Requires cookie*
	Title	Darstellung und Kristallstruktur von NaCu 3 Te 2 Preparation and Crystal Structure of NaCu 3 Te 2
	Abstract	The title compound was prepared by reacting a corresponding mixture of Na 2 Te 2 , copper and tellurium at 700 °C. NaCu 3 Te 2 forms crystals of metallic lustre which are rapidly decomposed in humid atmosphere. It crystallizes with a rhombohedral structure, space group R3m, with a — 4.276(3) Ä, c = 23.78(1) Ä. Z = 3. The crystal structure was determined from diffractometer data and refined to a conventional R of 0.050 for 135 independent reflections. The atomic arrangement of NaCu 3 Te 2 is based on a c.c.p. array of tellurium atoms with stacking sequence c 6 . Na and Cu occupy alternatingly the interstitial layers. Na is in an octahedral coordi-nation (d Na _ Te : 3.22 A), the Cu atoms occupy the tetrahedral and the octahedral voids. They are, however, shifted from the centers of these sites, resulting in an 1 + 3 coordination (d Cu _ Te : 2.70 Ä) for Cu on the tetrahedral. and an essentially trigonal coordination (d Cu Xe : 2.575 A) for Cu on the octahedral sites. NaCu 3 Te 2 shows no closer structural relationships to the other alkali-copper-chalcogenides known so far. However, its crystal structure may be interpreted as an ordered defect derivative structure of the CaCu 4 P 2 -type [1].
	Reference	(Z. Naturforsch. 42b, 130—134 [1987]; eingegangen am 11. April 1986)
	Published	1987
	Keywords	Ternary Chalcogenides, Sodium Copper Telluride, Crystal Structure, Preparation
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	TEI-XML for	default:Reihe_B/42/ZNB-1987-42b-0130.pdf
	Identifier	ZNB-1987-42b-0130
	Volume	42

133	Author	Dieter Kissel, Rudolf Hoppe	Requires cookie*
	Title	Zur Kenntnis von KCrF 4 [1], [2] On KCrF 4 [1], [2]
	Abstract	KCrF 4 has been prepared as yellowish-green single crystals (by heating of KF, CuF 2 , CrF 3 ; Au-tube, 750 °C, 60 d). It crystallizes in the orthorhombic crystal system (Pnma) with: a = 1573.2, b = 743.2, c = 1833.1 pm, Z = 24. The structure shows [Cr 3 F 9 F 6/2 ] 3 ~-columns along [010], The Madelung Part of Lattice Energie, MAPLE, is calculated and discussed, along with Effec-tive Coordination Numbers, ECoN (via Mean Fictive Ionic Radii, MEFIR). The structure is described using SCHLEGEL-diagrams.
	Reference	Z. Naturforsch. 42b, 135—141 (1987); eingegangen am 12. September 1986
	Published	1987
	Keywords	Preparation, Crystal Structure, MAPLE, SCHLEGEL-Diagrams
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	Identifier	ZNB-1987-42b-0135
	Volume	42

134	Author	Wolfgang Hönle, Bernhard Hettich, Arndt Simon	Requires cookie*
	Title	Preparation and Crystal Structure of LiGaCLj and LiGaI 4
	Abstract	The crystal structures of LiGaCl 4 and LiGaI 4 have been determined by single crystal X-ray methods. Both compounds are isotypic with LiAlCl 4 and characterized by LiX 6 octahedra and GaX 4 tetra-hedra. Mean bond lengths are: d(Ga-X) = 217.4 pm (Cl) and 255.9 pm (I); d(Li-X) = 263.9 pm (Cl) and 305.3 pm (I), respec-tively. Common features of the isotypic compounds LiGaX 4 (X -Cl, Br. I) are discussed.
	Reference	Z. Naturforsch. 42b, 248—250 (1987); eingegangen am 17. Oktober 1986
	Published	1987
	Keywords	Crystal Structure, X-Ray, Lithium Compounds
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	Identifier	ZNB-1987-42b-0248_n
	Volume	42

135	Author	H. P. Beck	Requires cookie*
	Title	Die Kristallstruktur des "Indium-Dibromids" (In I In ,I Br 4 ) The Crystal Structure of "Indium Dibromide" (In'ln ni Br 4 )
	Abstract	The crystal structure of In'ln III Br 4 (Indium-Di-bromide) has been determined by single crystal methods. The compound crystallizes with a GaCl 2 -type arrangement in the orthorhombic space group Pnna with the lattice constants: a = 797.6(2) pm, b = 1036.6(2) pm, c -1038.8(2) pm.
	Reference	Z. Naturforsch. 42b, 251—252 (1987); eingegangen am 26. September/17. November 1986
	Published	1987
	Keywords	Crystal Structure, Single Crystal Investigation, Indium Halides
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	Identifier	ZNB-1987-42b-0251_n
	Volume	42

136	Author	Sigurd Elz, Martin Dräger, Walter Schunack	Requires cookie*
	Title	Synthese und absolute Konfiguration kettenverzweigter, Cimetidin-analoger Thioether Synthesis and Absolute Configuration of Chain Branched Cimetidine Analogous Thioethers
	Abstract	Chain branched Cimetidine analogous thioethers. promising building blocks for the preparation of H : -histaminergic compounds, were svnthetized from chiral aminoalkanethiols. Enantiomeri-callv pure amino acids or aminoalcohols were used as starting materials. In one case, a resolution via neutral and acid di-0-(4-toluoyl)tartrates was achieved in good yields and satisfying enan-tiomeric excess. The absolute configuration of an ethyl branched compound was determined using X-ray diffraction and anomalous dispersion.
	Reference	Z. Naturforsch. 42b, 348—354 (1987); eingegangen am 22. September 1986
	Published	1987
	Keywords	Aminoalkanethiols, Cimetidine, Crystal Structure, Histamine H : -Receptor Impromidine
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	Identifier	ZNB-1987-42b-0348
	Volume	42

137	Author	Guido Wenski, Albrecht Mewis	Requires cookie*
	Title	Ternäre Varianten des Pyrit-Typs: Darstellung und Struktur von SrPt 4 P 6 , SrPt 4 As 6 , BaPt 4 As 6 und BaPt 2 P 3 Ternary Pyrite-Type Derivatives: Preparation and Crystal Structure of SrPt 4 P 6 , SrPt 4 As 6 , BaPt 4 As 6 and BaPt 2 P 3
	Abstract	The isotypic compounds SrPt 4 P 6 , SrPt 4 As 6 and BaPt 4 As 6 were found to crystallize with a Pyrite-type derivative structure (monoclinic, C2/c, Z = 4) in which one Sr or Ba atom per formula unit occupies the position of a P 2 or As 2 pair. BaPt 2 P 3 forms another Pyrite-type related structure (monoclinic, I > 2 1 /c, Z = 4) built up by Ba 2 Pt and Pt 3 P 6 layers. All crystal structures were refined from four-circle diffractometer data, the lattice constants are:
	Reference	Z. Naturforsch. 42b, 507—513 (1987); eingegangen am 28. Oktober 1986
	Published	1987
	Keywords	Ternary Pyrite-Type Derivatives, Platinum, Crystal Structure
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	Identifier	ZNB-1987-42b-0507
	Volume	42

138	Author	Michael Witt, HerbertW. Roesky, Mathias Noltemeyer, GeorgeM. Sheldrick	Requires cookie*
	Title	Synthese und Struktur von H 2 NS0 2 NWC1 4 - ein Kirsanov-Reagens mit einem Übergangsmetallatom Synthesis and Structure of H 2 NS0 2 NWC1 4 - a Kirsanov Reagent with a Transition Metal Atom
	Abstract	H 2 N-S0 2 -NWC1 4 (1) has been synthesized from WC1 6 and S0 2 (NH 2) 2 , and forms adducts with donor solvents such as pyridine and acetonitrile. 1CH 3 CN crystallizes in the space group P2,/n with cell constants a = 652.5(1); b = 2325.3(2); c = 775.8(1) pm; ß = 90.32(1)°. The nitrogen-tungsten bond length of 173.0 pm and the S—N—W bond angle of 169.3° indicate a W=N double bond.
	Reference	Z. Naturforsch. 42b, 519—521 (1987); eingegangen am 1. Dezember 1986/20. Januar 1987
	Published	1987
	Keywords	Crystal Structure, Sulfamide, Nitrogen-Tungsten Double Bond
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	Identifier	ZNB-1987-42b-0519
	Volume	42

139	Author	PeterG. Jones, Ralf Schelbach, Einhard Schwarzmann	Requires cookie*
	Title	Hydroxy Complexes of Gold 2. Calcium Aurates [1]
	Abstract	Two calcium aurate phases have been obtained as single crystals, phase 1 from H AUC1 4 + Ca(OH) 2 and phase 2 from NaAu(OH) 4 + Ca(C10 4) 2 . An X-ray structure determination of 1 shows its composition to be Ca 2 (0H) 3 (H 2 0) 4 [Au(0H) 4 ]. The apparent space group is Cmcm, but this corresponds to a sub-cell of the true structure. The disordered Cmcm structure was refined to R 0.032 for 813 reflections. The coordination geometry is square planar at gold (Au-O 1.97, 1.99 Ä), cubic at Ca(l) and octahedral at Ca(2). Phase 2 crystallizes in a primitive tetragonal cell with a 6.94, c 7.71 Ä; it is probably Ca[Au(OH) 4 ] 2 , but this has not yet been confirmed by a full structure determination.
	Reference	Z. Naturforsch. 42b, 522—524 (1987); received December 2 1986
	Published	1987
	Keywords	Gold(III), Hydroxide, Calcium, Crystal Structure
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	Identifier	ZNB-1987-42b-0522
	Volume	42

140	Author	Wolfgang Hönle, Arndt Simon, Gabriele Gerlach	Requires cookie*
	Title	Darstellung, Kristallstruktur und Eigenschaften von ß-Ga 2 Br 4 Preparation, Crystal Structure and Properties of y3-Ga 2 Br 4
	Abstract	The compounds Ga 2 Br 4 (a+ß) have been prepared by reacting GaBr 3 with Ga metal without a solvent or in a hydrocarbon medium. a-Ga 2 Br 4 is isotypic with Ga 2 Cl 4 , and /3-Ga 2 Br 4 with Ga 2 I 4 . Both forms have to be formulated as Ga + (GaBr 4)~ according to their crystal structures. The first order phase transition a—*ß has been investigated by means of DTA and temperature dependent X-ray powder photographs. The crystal structure of /3-Ga 2 Br 4 has been refined with single crystal data (R3c; a = 2163.4(8) pm; c = 869.2(4) pm; Z = 18; R = 0.037). Main building units are GaBr 4 " tetrahedra (d(Ga —Br) = 232.9 pm), connected in three dimensions by capped trigonal prisms (6+2+1) around Ga + . The crystal chemical relationships between y3-Ga 2 Br 4 and Ga 2 I 4 are discussed.
	Reference	Z. Naturforsch. 42b, 546 (1987); eingegangen am 13. November 1986
	Published	1987
	Keywords	Phase Transition, DTA Investigation, Crystal Structure
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	Identifier	ZNB-1987-42b-0546
	Volume	42

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