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161Author    Ernst Egert, Ursula Kliebisch, Uwe Klingebiel, Dieter SchmidtRequires cookie*
 Title    Cyclodi-und -trisilazane — Synthese, Reaktionen und Ringkopplungen Cyclodi-and -trisilazanes — Synthesis, Reactions and Ring Coupling  
 Abstract    Contrary to our expectations, a cyclotrisilazane is obtained instead of a cyclodisilazane by the reaction of the lithiated di-rerf-butyldiamino-silane with Hal 2 SiMe 2 . Mono-and disubstitution takes place in reactions of lithiated tetra-isopropyl cyclodisilazane with halogeno-silanes and -boranes. A disubstituted ring reacts with LiOC 4 H 9 -formed from LiC 4 H y and THF — to give an unsymmetrically substituted four-membered ring as proved by a crystal structure determination. Coupling of four-and six-membered rings occurs in the reaction of SiF-substituted and lithiated rings. 
  Reference    (Z. Naturforsch. 42b, 23—30 [1987]; eingegangen am 1. September 1986) 
  Published    1987 
  Keywords    Cyclosilazanes, Substitution, Ring Coupling, Crystal Structure 
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 Identifier    ZNB-1987-42b-0023 
 Volume    42 
162Author    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 
163Author    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 
164Author    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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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0248_n.pdf 
 Identifier    ZNB-1987-42b-0248_n 
 Volume    42 
165Author    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 
166Author    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 
167Author    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 
168Author    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 
169Author    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 
170Author    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 
171Author    Reinhard Nesper, Jan CurdaRequires cookie*
 Title    das erste Chalcogenid mit zweiwertigem Aluminium Al 7 Te 10 — the First Chalcogenide of Divalent Aluminum  
 Abstract    Al 7 Te 10 is prepared from a melt of the elements in stoichiometric amounts in a corundum crucible contained in a sealed quartz ampoule. The ruby red cube shaped crystals are stable below 840 K. The structure of Al 7 Te, 0 (R32-D^; a = 1439.5 pm, c = 1793.2 pm, Z = 6, R = 0.03) is a distorted defect variant of a tetrahedral arrangement of the 4H-polytype. The central unit, a double barrelane [Te 4 Al 4 —Al 4 Te 4 ], contains an Al —Al bond of 260 pm, which is somewhat longer (n = 0.83) than an expected single bond (250 pm, n = 1). This homopolar bond disturbs the electrostatically favorable (Al—Te—)" sequence in the structure which is compensated by the occurrence of four-membered Al 2 Te 2 rings. Al 7 Te 10 is a Zintl phase according to l/2{[Al 2+ -Al 2+ ][Al 3+ ] !2 [Te 2 ~] 20 } and exhibits semiconducting and diamagnetic behaviour. 
  Reference    Z. Naturforsch. 42b, 557 (1987); eingegangen am 9. Dezember 1986 
  Published    1987 
  Keywords    Synthesis, Crystal Structure, Divalent Aluminum, Aluminum-Aluminum Bonds 
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 Identifier    ZNB-1987-42b-0557 
 Volume    42 
172Author    Sigurd Elz, Martin Dräger, Hans-Joachim Sattler, Walter SchunackRequires cookie*
 Title    Synthese und Absolute Konfiguration von (+)-l-Amino-2-propanthiol-HCl Synthesis and Absolute Configuration of ( + )-l-Amino-2-propanethiol * HCl  
  Reference    Z. Naturforsch. 42b, 617—622 (1987); eingegangen am 22. August 1986 
  Published    1987 
  Keywords    Amino-2-propanethiol, Crystal Structure, Diastereomers, Impromidine, Thiazolidines 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0617.pdf 
 Identifier    ZNB-1987-42b-0617 
 Volume    42 
173Author    K. Brodersen, H. Procher, Hans-U HummelRequires cookie*
 Title    Synthesis and Crystal Structure of PbZn(NCS) 4  
 Abstract    PbZn(NCS) 4 is obtained from the binary compounds Pb(SCN) 2 and Zn(NCS) 2 with traces of water in an ultra-sound bath. The space group of the complex is Pn2[a (standard: Pna2,) with Z = 4. The structure consists of as-connected octahedra ^.[PbS 2 S 4/2 ] forming two-dimensional layers. All SCN-groups are bound to Zn 2+ via their N atoms. The resulting ZnN 4 tetrahedra are arranged in the cavities formed by the PbS 6 octahedra. 
  Reference    Z. Naturforsch. 42b, 679—681 (1987); eingegangen am 6. November 1986/27. Januar 1987 
  Published    1987 
  Keywords    Lead(II) Tetraisothiocyanatozincate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0679.pdf 
 Identifier    ZNB-1987-42b-0679 
 Volume    42 
174Author    R. Minkwitz, H. Prenzel, H. PritzkowRequires cookie*
 Title    Beiträge zur Chemie der Schwefel-Halogenide, 17 [1] Dimethyl(methylthio)-und Dimethyl(phenylthio)sulfonium-Salze Contributions to the Chemistry of Sulfur Halides, 17 [1] Dimethyl(methylthio)-and Dimethyl(phenylthio)sulfonium Salts  
 Abstract    IR, Raman and NMR spectroscopic studies of dimethyl(methylthio)-and dimethyl(phenyl-thio)sulfonium salts (CH 3) 2 SSR + A~ (R -CH 3 , C 6 H 5 ; A = AsF 6 ~, SbCl 6 ~) are reported. The crystal structure of (CH 3) 2 SSCH 3 + AsF 6 ~ shows for the cation a conformation different from that reported for the hexachloroantimonate. 
  Reference    Z. Naturforsch. 42b, 750—755 (1987); eingegangen am 5. Dezember 1986/4. Februar 1987 
  Published    1987 
  Keywords    Thiosulfonium Salts, NMR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0750.pdf 
 Identifier    ZNB-1987-42b-0750 
 Volume    42 
175Author    Z. NaturforschRequires cookie*
 Title    Darstellung und Kristallstrukturen von C a^ ^ N und Sr4In2N  
 Abstract    The new compounds Ca4In2N and Sr4In2N crystallize in the tetragonal system (space group 14,/am d, No. 141). In and Ca together form a rocksalt structure. All octahedral holes, which are built by Ca only, are occupied by nitrogen. The In atom s form In —In zig-zag-chains; the In —In bond lengths are 316.4 pm (Ca com pound) and 332.0 
  Reference    Z. Naturforsch. 42b, 825—827 (1987); eingegangen am 1. April 1987 
  Published    1987 
  Keywords    Crystal Structure, X-Ray, Alkaline E arth Indium Nitrides 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0825.pdf 
 Identifier    ZNB-1987-42b-0825 
 Volume    42 
176Author    Kay Jansen, Kurt DehnickeRequires cookie*
 Title    Synthese und Kristallstruktur von (PPh4)2[Mo2(02C—Ph)4Cl4] * 2 CH2C12, einem Komplex mit Mo=Mo-Bindung Synthesis and Crystal Structure of (PPh4 )2 [Mo2 (0 2 C —Ph)4 Cl4] -2 CH 2 C12, a Complex with M o=M o Bonding  
 Abstract    The title com pound has been prepared from (PPh4)2[M o2(0 2C —Ph)4Cl2] and CC14 in C H 2C12 solution as moisture sensitive crystals, which are black in reflexion and yellow in transmission. (PPh4)2[M o2(0 2C —Ph)4Cl4] • 2 C H 2C12 was characterized by a X-ray crystal structure determ ination (7873 observed independent reflexions, R = 0.048). It crystallizes in the space group P 1 with one formula unit in the unit cell; the lattice constants are a = 1186.4; b = 1404.0; c = 1451.0 pm; a = 61.98°; ß = 78.91°; y = 78.26°. The structure consists o f PPh4® ions, C H 2C12 m olecules and centrosym m etric anions [M o2(0 2C —Ph)4Cl4]20 containing a molybdenum d3d3 unit with a relatively long M o = M o bond o f 249.6 pm. The M o= M o group is spanned in a chelate manner by four O atoms of two benzoate groups and by two further single O atoms o f two further benzoate groups. Two terminal Cl atom s on each Mo atom com plete the pentagonal bipyramidal coordination spheres about the Mo atoms. 
  Reference    Z. Naturforsch. 42b, 1097—1101 (1987); eingegangen am 2. März 1987 
  Published    1987 
  Keywords    Tetrabenzoato-tetrachloro-dim olybdate, Synthesis, IR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1097.pdf 
 Identifier    ZNB-1987-42b-1097 
 Volume    42 
177Author    D. Ietm Ar Stalke, Nayla Keweloh, Uwe Klingebiel, M. Atthias, N. Oltem Eyer, G. Eorge, M. SheldrickRequires cookie*
 Title    Von lithiierten Aminofluorsilanen zu mono-und dimeren Iminosilanen From Lithiated Aminofluorosilanes to Mono-and Dimeric Iminosilanes  
 Abstract    Depending on the solvent and the bulkiness of the substituents, lithiated aminofluorosilanes are dimers, monomers, or LiF-adducts of iminosilanes. In the crystal structure of the dimeric lithium derivative of di-terr-butyl(/m-butylamino)fluorosilane, each lithium atom is coordinated by one fluorine and two nitrogen atoms. LiF-elimination leads — if sterically possible — to dimerisation. The limits of dimerisation are reached with the dimer diisopropyl(trwm-butylphenyl-imino)silane, for which the crystal structure analysis shows severe steric distortions. Fluorine-chlorine-exchange occurs in reactions of lithiated (tri-fm-butylphenylimino)fluorosilanes with Me3SiCl. Iminosilanes are obtained by thermal LiCl-elimination from the resulting salts. 
  Reference    Z. Naturforsch. 42b, 1237—1244 (1987); eingegangen am 4. Mai/25. Juni 1987 
  Published    1987 
  Keywords    Aminofluorosilanes, Lithium Salts, Cyclisation, Iminosilanes, Crystal Structure 
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 Identifier    ZNB-1987-42b-1237 
 Volume    42 
178Author    Peter Schreiber, Karl Wieghardt, Ulrich Flörke, Hans-Jürgen HauptRequires cookie*
 Title    Synthese von Wolframkomplexen  
 Abstract    des Typs [ L W (C O) 3X ] + (X = H , F, Br; L = 1,4,7-Triazacyclononan). Die Kristallstrukturen von [L W (C O) 3B r]B F 4 und [L W (C O) 3H ] 2[W O C l5] • h 2o Synthesis o f Tungsten Complexes o f the Type [L W (C O)3X ] + (X = H, F, Br; L = 1.4,7-triazacyclononane). The Crystal Structures o f [L W (C O)3Br]BF4 and [L W (C O)3H ]2[W O C l5] • H 20 The reaction of LW (C O), (L = 1,4,7-triazacyclononane) with Br2 in CHCl, yields orange [L W (C O)3Br](Br3) which was converted to its BF4~ salt. [L W (C O)3Br]BF4 crystallizes in the triclinic space group P 1 (a = 8.273(3), b = 8.628(2), c = 13.034(3) Ä , a = 80.10(2), ß = 72.69(2). y = 61.14(2)°, Z = 2); it consists of cations [L W (C O)3Br] + , with seven-coordinate W atoms, and BF4 -anions. The corresponding salt [L W (C O)3F](PFft) was obtained from L W (C O)3 with 20% aqueous HF in the presence of air and addition of NaPF6. The analogous reaction with 37% aqueous HC1 affords green crystals of [L W (C O)3H ]2[W OCl5] • H 20 which crystallize in the mono­ clinic space group P2,/c (a = 12.234(4), b = 18.853(7), c = 14.609(5) Ä . ß = 105.65(3)°, Z — 4). The W atoms in the [L W (C O)3H ]+ cations are seven-coordinate; the six-coordinate [W OCl5]: anions are not disordered. The W = 0 distance is short (1.72(1) Ä), the mean equatorial W —Cl distance is 2.390 Ä whereas the W —Cl bond distance trans to the W = 0 group is 2.562(5) Ä. 
  Reference    Z. Naturforsch. 42b, 1391 (1987); eingegangen am 2. Juli 1987 
  Published    1987 
  Keywords    Tungsten Complexes, X-Ray, Crystal Structure 
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 Identifier    ZNB-1987-42b-1391 
 Volume    42 
179Author    Brigitte Eisenmann, Jürgen KleinRequires cookie*
 Title    Eine Zintl-Phase mit isolierten SnSb 4 8 -Anionen: Na 8 SnSb 4 A Zintl Phase with Isolated SnSb/ -Anions, Na 8 SnSb 4  
  Reference    (Z. Naturforsch. 43b, 69—71 [1988]; eingegangen am 10. September 1987) 
  Published    1988 
  Keywords    Crystal Structure, Semimetallic Anions, Zintl Phases 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0069.pdf 
 Identifier    ZNB-1988-43b-0069 
 Volume    43 
180Author    Christian RoblRequires cookie*
 Title    Erdalkaliquadratate, VI [1] SrC 4 0 4 -3H 2 0, Typ III Alkaline-earth Squarates, VI [1] SrC 4 0 4 -3H 2 0, Type III  
 Abstract    SrC 4 0 4 -3H 2 0, type III, was obtained in an aqueous silica gel besides crystals of SrC 4 0 4 • 3 H 2 0, type I. X-ray crystal structure analysis showed close relationship to BaC 4 0 4 -3H 2 0, but no iso-typism. Sr 2+ is coordinated by four water molecules and four oxygen atoms of the squarate dianion. The connection of Sr 2+ with C 4 0 4 2 leads to layers. The geometry of C 4 0 4 2 is typical for delocalized jr-systems. The O squarate atoms are not equally bound to Sr 2+ . One O squarate atom (0(4)) is bound to two Sr 2+ , two (O(l), 0(2)) are bound to one Sr 2+ , respectively, and the fourth O squaraIe atom (0(3)) shows no bonding contact to Sr 2+ . These differences are compensated for by inter-molecular hydrogen bonds which involve 0(3) three times, O(l) and 0(2) once each, but not 0(4). 
  Reference    (Z. Naturforsch. 43b, 99—103 [1988]; eingegangen am 21. September 1987) 
  Published    1988 
  Keywords    Strontium Squarate Type III, Preparation, Crystal Structure, Hydrogen Bonding 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0099.pdf 
 Identifier    ZNB-1988-43b-0099 
 Volume    43 
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