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121Author    RainerM. Attes, A. Nnegret Preuß, Kurt-Ludwig RichterRequires 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 
122Author    G.Erhard Thiele, HeinzW R Otter, I. M. Br, Jochen Artin Lietz, EllermRequires 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 
123Author    Ulrich Kynast, Elke Conradi, UlrichM. Üller, Kurt DehnickeRequires 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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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-1680.pdf 
 Identifier    ZNB-1984-39b-1680 
 Volume    39 
124Author    Rolf Minkwitz, Klaus Jänichen, Herbert Prenzel, Volker WölfelRequires 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 
125Author    Manfred Regitz, Klaus Urgast, Gerhard MaasRequires 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 
126Author    Siegfried Pohl, Wolfgang Saak, Bernt KrebsRequires 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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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0251.pdf 
 Identifier    ZNB-1985-40b-0251 
 Volume    40 
127Author    Udo Demant, Elke Conradi, Ulrich Müller, Kurt DehnickeRequires 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 
128Author    Heinz Hoberg, Klaus Radine, Carl Krüger, MariaJ. RomãoRequires 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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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0607.pdf 
 Identifier    ZNB-1985-40b-0607 
 Volume    40 
129Author    Ulrich Schwanitz-Schüller, Arndt SimonRequires 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 
130Author    Horst Sabrowsky, Alfred Thimm, Petra MertensRequires 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 
131Author    Jens Anhaus, ZafarA. Siddiqi, HerbertW. Roesky, JanW. Bats, Yalcin ElermanRequires 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 
132Author    KurtO. KleppRequires 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 
133Author    Dieter Kissel, Rudolf HoppeRequires 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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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0135.pdf 
 Identifier    ZNB-1987-42b-0135 
 Volume    42 
134Author    Wolfgang Hönle, Bernhard Hettich, Arndt SimonRequires 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 
135Author    H. P. BeckRequires 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 
136Author    Sigurd Elz, Martin Dräger, Walter SchunackRequires 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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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0348.pdf 
 Identifier    ZNB-1987-42b-0348 
 Volume    42 
137Author    Guido Wenski, Albrecht MewisRequires 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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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0507.pdf 
 Identifier    ZNB-1987-42b-0507 
 Volume    42 
138Author    Michael Witt, HerbertW. Roesky, Mathias Noltemeyer, GeorgeM. SheldrickRequires 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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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0519.pdf 
 Identifier    ZNB-1987-42b-0519 
 Volume    42 
139Author    PeterG. Jones, Ralf Schelbach, Einhard SchwarzmannRequires 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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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0522.pdf 
 Identifier    ZNB-1987-42b-0522 
 Volume    42 
140Author    Wolfgang Hönle, Arndt Simon, Gabriele GerlachRequires 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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