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'Crystal Structure' in keywords Facet   Publication Year 1998  [X]
Facet   section ZfN Section B:Volume 053  [X]
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1998[X]
1Author    Hk Wulff, Müller-BuschbaumRequires cookie*
 Title    Synthese und Kristallstruktur des Lanthan-Titanat-Tellurats LaTi  
 Abstract    (Ti0 2 5Te0j 5)O6 und seine Verwandtschaft mit PbSb20 6 und Sr(MnTe)06 Synthesis and Crystal Structure of the Lanthanum Titanate Tellurate LaTi(Ti0 25Te0 75) 0 6 and its Relationship to PbSb20 6 and Sr(M nTe)06 L. Single crystals of LaTi(Ti0 25T e o .75) 0 6 have been prepared by solid state reactions. X-ray investigations led to trigonal symmetry, space group C3-P3 , a = 5.141(10), c = 5.218(10) A, Z = 1. The compound is characterized by a predominantly ordered distribution of Ti4+ and Te6+. Typical features of the crystal structure are staggered layers containing edge connected T i0 6 and (Ti,Te)06 octahedra. The layers are connected by La3+ ions receiving an octahedral coordination by the surrounding oxygen ions. The relationships to the PbSb20 6 type and the recently described compound Sr(M nTe)06 are discussed. 
  Reference    Z. Naturforsch. 53b, 149—152 (1998); eingegangen am 25. November 1997 
  Published    1998 
  Keywords    Lanthanum, Titanate, Tellurate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0149.pdf 
 Identifier    ZNB-1998-53b-0149 
 Volume    53 
2Author    G. Waidmann, M. JansenRequires cookie*
 Title    Synthese und Charakterisierung des Fulleren-Kokristallisats C60*SiH(C6H5)3 Synthesis and Characterisation of the Fullerene Co-Crystal C60*SiH(C6H5)3  
 Abstract    A new fullerene co-crystal C60*SiH(C6H5)3 has been synthesized by crystallisation from a melt of SiH(C6H5)3 and C60 in sealed duran tubes at 80°C. X-ray investigations led to triclinic symmetry, space group P i, a = 10.086(1),/? = 14.431(2), c = 14.911(2) Ä, a = 79.13(1), ß = 74.943(9), 7 = 88.33(1)°, V = 2058.0(4) A 3, Z = 2. The crystal structure consists of isolated fullerene and silane molecules. At -80°C, C60 is still rotationally disordered. Temperature dependent Guinier powder diagrams do not show any phase transformation between 25 and -165°C. The compound is stable in air. 
  Reference    Z. Naturforsch. 53b, 161—164 (1998); eingegangen am 14. November 1997 
  Published    1998 
  Keywords    Fullerene C60, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0161.pdf 
 Identifier    ZNB-1998-53b-0161 
 Volume    53 
3Author    Hk Wulff, Müller-BuschbaumRequires cookie*
 Title    Isolierte trigonale S r 0 6-Prismen verknüpfen Kagome-Netze im Strontium-Manganat(I V)-Tellurat( VI): SrMnTe06 Kagome Layers Connected by Isolated Trigonal Sr06 Prisms in the Strontium Manganate(IV) Tellurate(VI): SrMnTe06 L  
 Abstract    Single crystals of the hitherto unknown compound SrM nT e06 have been prepared from Sr(0H)2-8H20 , M n C 0 3(aq) and T e 0 2 in air by crystallization below the melt range. X-ray in­ vestigations showed hexagonal symmetry, space group D3h-P62m, lattice constants a = 5.143(1), c = 5.384(2) A, Z = 1. SrM nTe06 is characterized by staggered [(Mn/Te)60 18] Kagome layers along [001]. These layers are connected by Sr2+ ions, resulting in S r0 6 prisms isolated from each other. The structure is discussed with respect to the connection of Kagome nets in the quaternary oxides of the Ba3Ln40 9 type. 
  Reference    Z. Naturforsch. 53b, 283—286 (1998); eingegangen am 7. November 1997 
  Published    1998 
  Keywords    Strontium, Manganese, Tellurate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0283.pdf 
 Identifier    ZNB-1998-53b-0283 
 Volume    53 
4Author    B. Wedel, L. Wulff, Hk Müller-BuschbaumRequires cookie*
 Title    Isolierte ^[TeOs]-Oktaederketten im Bleitellurat Pb2T e05 Isolated ^ [Te05] Chains of Octahedra in the Lead Tellurate Pb2T e05  
 Abstract    Single crystals of Pb2T e0 5 have been prepared by flux techniques. X-ray investigations showed a new crystal structure with monoclinic symmetry, space group Cj-Cc, a = 13.099(3), b = 5.714(1), c = 7.520(2) Ä, ß = 123,80(3)°, Z = 4. Pb2T e 0 5 is characterized by o[o[Te05] chains of octahedra isolated from each other and incorporated into an edge, corner and face connected frame of P b 0 7 polyhedra. Possible positions o f the lone pair o f electrons of Pb2+ are estimated by calculations of Coulomb terms of lattice energy. 
  Reference    Z. Naturforsch. 53b, 287—290 (1998); eingegangen am 17. November 1997 
  Published    1998 
  Keywords    Lead, Tellurate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0287.pdf 
 Identifier    ZNB-1998-53b-0287 
 Volume    53 
5Author    Thorsten Grob, FrankW. Eller, K. Urt, D. EhnickeRequires cookie*
 Title    Die Kristallstruktur von [Me3PN(H)PMe3]4l 28? einem Polyiodid mit I3~-, lg2--und I144"-Ionen Crystal Structure o f [M e3P N (H )P M e3]4I28, a Polyiodide w ith I3~, I82 -, and I 144~ Ions  
 Abstract    Black-red single crystals of [Me3PN(H)PMe3]4I28 have been prepared by the reaction of [Me3PNPMe3]I with iodine in dichloromethane solution in the presence of Me3SiI and traces of water. The polyiodide crystallizes triclinically in the space group Pi with two formula units per unit cell with the lattice dimensions a = 831.2(1), b = 1661.2(3), c = 1739.0(3) pm, q = 87.26(1)°, ß = 79.48(1)°, 7 = 78.17(1)°. The structure consists of [Me3PN(H)PMe3]2+ ions, linear I3~ ions, z-shaped I8: ~ ions, and zig-zag chains of I I44-ions, the terminal iodine atoms of which form I-H -N hydrogen bridges to the cations. 
  Reference    Z. Naturforsch. 53b, 552—556 (1998); eingegangen am 23. Februar 1998 
  Published    1998 
  Keywords    Polyiodide, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0552.pdf 
 Identifier    ZNB-1998-53b-0552 
 Volume    53 
6Author    Andreas Mommertz, Gertraud Geiseier, Klaus Harms, Kurt DehnickeRequires cookie*
 Title    Kristallstrukturen von Me2Si[N(SiMe3)2]2 und [Me2Si(NPh)(NHPh)LiOEt2]2 Crystal Structures of Me2Si[N(SiM e3)2]2 and [Me2Si(NPh)(NHPh)Li-OEt2]2  
 Abstract    The crystal structures of the title compounds are reported. Me2Si[N(SiMe3)2]2 : Space group Pbcn, Z = 4, lattice dimensions at 213 K: a = 1487.8(1), b = 1299.4(1), c = 1259.7(1) pm. The compound forms monomeric molecules with crystallographic C2 symmetry and Si-N bond lengths of 177.9(3), 171.6(3) and 175,2(3) pm. [Me2 Si(NPh)(NHPh)Li OEt2]2: Space group P2]/n, Z = 2, lattice dimensions at 190 K: a = 1082.7(3), b = 1038.8(2), c = 1641.3(4) pm, ß = 91.350(3)°. The compound forms centrosymmetric dimeric molecules in which the lithium atoms are members of a Li2N2 ring with Li-N bond lengths of 206.6(2) and 213.5(2) pm. The hydrogen atom at the nitrogen atom of the HNPh~ group is not involved in hydrogen bridging bonds. 
  Reference    Z. Naturforsch. 53b, 977—980 (1998); eingegangen am 29. Mai 1998 
  Published    1998 
  Keywords    Silylamine, Lithium Amide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0977.pdf 
 Identifier    ZNB-1998-53b-0977 
 Volume    53 
7Author    Karl-Friedrich Tebbe, Theo Gilles, Bernhard RadkeRequires cookie*
 Title    Untersuchungen an Polyhalogeniden  
 Abstract    , XXXIII [1] Polyiodide des Nickelhexamminkomplexes: Nickelhexamminbistriiodid [Ni(NH3)6](I3) 2 und Nickelhexamminbispentaiodid [Ni(NH3)6 ] (I5)2 Studies of Polyhalides, 33 [11 Polyiodides of the Nickel Hexammine Complex: Nickelhexammine Bistriiodide [Ni(NH3)6](I3)2 and Nickelhexammine Bispentaiodide [Ni(NH3)6l(I5) The compounds [Ni(NH3)6 ](I3) 2 and [Ni(NH3)6 ](I5) 2 have been prepared by the reaction of stoichiometric amounts of [Ni(NH3)6 ]Cl2, KI, and I2 in water. The already known triiodide crystallizes in the monoclinic space group C2/c with a = 1541,0(10), b = 1521.6(8), c = 876.1 (7) pm, ß = 101.44(6)° and Z = 4. The new pentaiodide crystallizes in the monoclinic space group P2,/n with a = 899.6(4), b = 1681.6(5), c = 946.8(7) pm, ß = 110.90(5)° and Z = 2. Both compounds contain nearly octahedral cations [Ni(NH3)6]2+ and simultaneously a linear and a bent triiodide ion I3_ with nearly equal bond lengths or a unsymmetrical V-shaped pentaiodide ion I5_ which is lined up to a new type of pentaiodide chain. 
  Reference    (Z. Naturforsch. 53b, 87—92 [1998]; eingegangen am 25. September 1997) 
  Published    1998 
  Keywords    Polyiodide, Triiodide, Pentaiodide, Nickel Hexammine Complex, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0087.pdf 
 Identifier    ZNB-1998-53b-0087 
 Volume    53 
8Author    V. Erena, M.T T Hiede, W. Olfgang, JeitschkoRequires cookie*
 Title    Ternary Intermetallic Compounds L«Mn2Ali0 (Ln = Y, La-Nd, Sm, Gd-Dy) and L«Re2Al10 (Ln = Ce, Pr, Sm) with CaCr2Al10-Type Structure  
 Abstract    The twelve title compounds have been prepared for the first time. Their CaCnA lio-type structure (PA/nm m, Z = 4) was refined from single-crystal X-ray data for the three representatives TbM mAlio (a = 1274.3(2) pm, c = 511.4(2) pm, R = 0.025 for 680 structure factors F and 43 variable parameters VO, CeRe2Alio (a -1295.5(5) pm, c -517.2(4) pm, R = 0.054 for 810 F a n d 46 V), and SmReaAlio (a = 1291.5(2) pm, c = 516.5(1) pm, R = 0.021 for 622 F and 46 V). The atomic positions of the lanthanoid and transition metal atoms are fully occupied. Significant deviations from the full occupancies were observed for two aluminum sites in TbM mAlio and for all five aluminum sites of the two rhenium-containing compounds, resulting in the compositions TbMn2Al9.63(2), CeRe2Al9.52(8), and SmRe2Al9.i6< 9)-The cell volume of CeRe2Alio and to a smaller extent also that of CeMm A1 io indicate mixed or intermediate +III/+IV valencies of the cerium atoms in these compounds. The structural relationships between the three closely related body-centered tetragonal structures of ThM ni2, CeMn-iAlx, DyFeöAU, and the primitive tetragonal structure of CaCnA lio are briefly discussed. 
  Reference    Z. Naturforsch. 53b, 673—678 (1998); received February 2 1998 
  Published    1998 
  Keywords    Intermetallic Compounds, Crystal Structure, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0673.pdf 
 Identifier    ZNB-1998-53b-0673 
 Volume    53 
9Author    Francoanellite K^alschpo^cpo, Stefan Dicka, Thomas ZeiskebRequires cookie*
 Title    Francoanellit K3A15HP04)6(P04)2*12H20: Struktur und Synthese durch topochemische Entwässerung von Taranakit-I 2 H2O: Structure and Synthesis by Topochemical Dehydration of Taranakite  
 Abstract    Single crystals of synthetic francoanellite K3Al5(HP0 4)6(P0 4)2-12H20 could be obtained for the first time by topochemical dehydration of taranakite crystals. An X-ray structure de­ termination showed francoanellite to be the mineral with the second longest crystallographic axis described hitherto. Crystal data: space group R3c, a = 869.0(2), c = 8227(1)pm, Z = 6 , R g = 0.042. Francoanellite is a layer structure mineral having six layers of composition [K3Al5(HP04)6(P04)2(H2 0)i2], connected by hydrogen bonds. The rigid layer is formed by columns of corner sharing hydrogen phosphate tetrahedra and AIOö-octahedra which are inter­ connected by additional six-coordinated A1 ions. In trigonal holes of the layer orthophosphate ions are situated. The structure of francoanellite is very similar to the structure of taranakite K3H6Al5(P04)8-18H20 which has planar water interlayers between the Al-phosphate layers. A neutron scattering experiment with subsequent Rietveld refinement of the powder pattern gave the H-atom positions. Hydrogen bonds in francoanellite are formed within the rigid layers and between them. During the reaction taranakite —► francoanellite crystals in an intermediate stage of dehy­ dration could be obtained. From the c-axis of 8858 pm and one-dimensional electron density projections it can be proposed that in these crystals every second water interlayer was lost and a first order staging product of the deintercalation of water from taranakite was formed. 
  Reference    Z. Naturforsch. 53b, 711—719 (1998); eingegangen am 2. März 1998 
  Published    1998 
  Keywords    Crystal Structure, Neutron Scattering, Francoanellite, Taranakite, Topochemical Reaction 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0711.pdf 
 Identifier    ZNB-1998-53b-0711 
 Volume    53 
10Author    Andreas Mommertz, Roland Leo, Werner Massa, Kurt DehnickeRequires cookie*
 Title    Uber die Reaktion von Bis(f-butylamino)dimethylsilan mit Titantetrachlorid. Kristallstrukturen des Imido-Komplexes [TiCl2 (N-CMe3 )(H2 N-CMe3 )(CH3CN)]2 und des Ketimido-Komplexes [TiCl3 {NC(Me)N(H)CMe3}(CH3CN)2 ]  
 Abstract    On the Reaction of Bis(f-butylamino)dimethylsilane with Titanium Tetrachloride. Crystal Structures of the Imido Complex [TiCl->(N-CMe3)(H-,N-CMe3)(CH3CN)]2 and of the Ketimido Complex [TiCl3{NC(Me)N(H)CMe3}(CH3CN)2] The reaction of bis(f-butylamino)dimethylsilane with titanium tetrachloride in dichloro­ methane solution leads to a mixture of compounds from which the imido complex (H3N-CMe3)2[TiCl3(N-CMe3)]2 (1) and by extraction of the residue with acetonitrile the imido complex [TiCl2(N-CMe3)(H2N-CMe3)(CH3CN)]2 (2) can be isolated. 1 reacts with acetonitrile to give the ketimido complex [TiCl3{NC(Me)N(H)CMe3}(CH3CN)2] (3). According to crystal structure determinations 2 consists of centrosymmetric dimeric molecules containing TiCl2Ti bridges, the N-CMe3~ ligands being in equatorial positions with TiN bond lengths of 168.8(4) pm which corresponds to double bonds. In the monomeric complex 3 the chloro ligands are in meridional positions of the distorted octahedrally coordinated titanium atom with a TiN bond length of 175.7(2) pm of the ketimido ligand. 
  Reference    Z. Naturforsch. 53b, 887—892 (1998); eingegangen am 27. April 1998 
  Published    1998 
  Keywords    Titanium, Imido Complex, Ketimido Complex, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0887.pdf 
 Identifier    ZNB-1998-53b-0887 
 Volume    53 
11Author    Werner Urland, Helmut PersonRequires cookie*
 Title    Zur Kristallstruktur von Ho2Se3 On the Crystal Structure of Ho2Se3  
 Abstract    Starting from HoSe2_ t powder and holmium metal bright brownish-yellow, plate-like single crystals of Ho2Se3 could be prepared by chemical transport with A1C13. Holmium sesquiselenide crystallizes in the Sc2S3-type structure, space group Fddd, with lattice constants a = 1140,7(2), b -812,6(1) and c = 2423,9(3) pm. 
  Reference    Z. Naturforsch. 53b, 900—902 (1998); eingegangen am 9. April 1998 
  Published    1998 
  Keywords    Holmium Sesquiselenide, Chemical Transport, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0900.pdf 
 Identifier    ZNB-1998-53b-0900 
 Volume    53 
12Author    Isabel Díaza, Vicente Fernández, José Luis, M. Artínezb, Lothar Beyer0, Astrid Pilzd, Ulrich MüllerdRequires cookie*
 Title    Thermochrome Chloro-und Bromocuprate  
 Abstract    [C(NH2)3]2[CuBr4], (H3CC2N2SNH3)2[Cu2Br6], (C7N3H14)2[CuC14], (C7N3H14)2[CuBr4], [(Cl, Br)C3N2H6][CuCl3OH2] und (BrC3N2H6)2[CuBr4] Thermochromic Chloro-and Bromocuprates: [C(NH2)3]2CuBr4, (H3CC2N9SNH3)2[Cu2Br6], (C7N 3H 14)2[CuC14], (C7N3H 14)2[CuBr4], [(Cl, Br)C3N2H6][CuCl3OH2] and (BrC3N2H6)2[CuBr4] CuCl2 and CuBr2 were reacted in water-ethanol solutions containing HC1 or HBr, re­ spectively, with the following organic bases or their chlorides or bromides: guanidine (1), 2-amino-5-methyl-l,3,4-thiadiazol (2), hexahydro-2//-pyrimidine-(1,2A)-pyrimidine (3), and 2-hydrazino-2-imidazoline (4). With 1 and 3 the tetrahalocuprates (lH)2[CuBr4], (3H)2[CuCl4] and (3H)2[CuBr4] were obtained having flattened tetrahedral anions. 2 and CuBr2 form (2H)2[Cu2Br6], with nearly planar [Cu2Br6]2-ions that are associated to chains with square-pyramidal coordination of Cu. 2 and CuCl2 yield the hydrate (2H)C1H20 . 4 undergoes substitution of the hydrazine group for halogen, yielding the 2-halo-2-imidazolinium salts (5H)0 2(6H)o,8[CuCl3OH2] and (6H)2[CuBr4] in addition to [H3NCH2CH2NH3][CuCl4] (5 = 2-chloro-, 6 = 2-bromo-2-imidazoline). The planar [CuCl3(OH2)]_ ions are associated to chains. Crystal structure determinations were performed with (lH)2[CuBr4], (2H)2[Cu2Br6], (3H)2[CuCl4], (5H)0 2(6H)o 8[CuCl3OH2] and (6H)2[CuBr4]; the latter three at 298 K and at 166 K or 173 K. The known crystal structure of [H3N(CH2)2NH3][CuCl4] was redetermined at 166 K. In all cases small differences of bond lengths and bond angles are observed between room temperature and low temperature. The magnetic properties and electrospray mass spectra were measured. The products show thermochromic behavior. 
  Reference    Z. Naturforsch. 53b, 933—938 (1998); eingegangen am 6. Mai 1998 
  Published    1998 
  Keywords    Chloro Cuprates, Bromo Cuprates, Crystal Structures, Thermochromism 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0933.pdf 
 Identifier    ZNB-1998-53b-0933 
 Volume    53 
13Author    Steffen Runge, M. Athias, O. SengeRequires cookie*
 Title    Electron Donor-Acceptor Compounds. Synthesis and Structure of 5-(l,4-Benzoquinone-2-yl)-10,15,20-trialkylporphyrins  
 Abstract    A series of 5-(benzoquinone)-10,15,20-trialkylporphyrins was synthesized via cross conden­ sation of the respective aldehydes, 2,5-dimethoxybenzaldehyde and pyrrole followed by de-methylation with BBr3 and oxidation with P b 0 2. This method worked reasonably well for compounds bearing the benzoquinone substituent and butyl, isopropyl, 1 -methylpropyl and 2-ethylpropyl residues (2a-d). The free base porphyrin quinones were converted into the zinc(II) complexes (3a-d) all of which showed remarkable stability for porphyrin quinones. The zinc(II) complex 3c bearing isopropyl residues was investigated by X-ray crystallography and showed a supramolecular structure consisting of polymeric chains facilitated by coordina­ tion of a benzoquinone oxygen to a neighboring zinc(II) center. Attempts to synthesize a 5-(benzoquinone)-10,15,20-tris(terr-butylporphyrin) resulted in the formation of a yellow por-phomethene (4), which could not be oxidized further. A crystal structure analysis of 4, the first for a free base porphomethene, shows an extremely twisted conformation with syn-orientation of the three rm-butyl groups. The results indicate that new methods will have to be developed for the synthesis of nonplanar porphyrin quinones. 
  Reference    Z. Naturforsch. 53b, 1021—1030 (1998); received June 15 1998 
  Published    1998 
  Keywords    Porphyrins, Quinones, Electron Transfer Compounds, Crystal Structure, Conformation 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1021.pdf 
 Identifier    ZNB-1998-53b-1021 
 Volume    53 
14Author    M. Sm, B. Ern, H. Ard, N. Eum Üller, K. Urt, D. EhnickeRequires cookie*
 Title    ClPb[N(SiMe3)2]3 C rystal S tructure of C lPb[N (SiM e3 ) 2 ]3  
 Abstract    Pale brown single crystals of the title compound have been obtained by the reaction of Pb[N(SiMe3) 2] 2 with molybdenum pentachloride in ether solution as a result of a redox reaction. ClPb[N(SiMe3) 2] 3 crystallizes in the trigonal space group R3 with three formula units per unit cell. Lattice dimensions at -50 °C: a = b -1828.7(2), c = 854.5(1) pm. The compound forms monomeric molecules with bond lengths P b-C l = 247.9(4) pm and P b -N = 213(2) pm. 
  Reference    Z. Naturforsch. 53b, 1074—1076 (1998); eingegangen am 3. Juli 1998 
  Published    1998 
  Keywords    Lead(IV), Amido Complex, Crystal Structure 
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 Identifier    ZNB-1998-53b-1074_n 
 Volume    53 
15Author    Frank Wendland, Christian Näther, Michael Schur, Wolfgang BenschRequires cookie*
 Title    Solvothermal Synthesis and Crystal Structure Determination of Tris- (ethyleneamine-ammonium) Tetraselenoantimonat: Non-Centrosymmetry Mediated by an Extended Unusual N-H***N Hydrogen Bonded Network?  
 Abstract    The title compound has been synthesized under solvothermal conditions by the reaction of elemental chromium, antimony and selenium in a solution of 40% 1,2-ethanediamine (en) in methanol. The crystal structure consists of tetrahedral SbSe,*3 --anions which are connected by monoprotonated 1,2-ethanediamine (enH+) cations via N-H--Se hydrogen bonding. The enH+ cations are joined via strong N-H -N hydrogen bonds between the ammonium hydrogen and the amino nitrogen atom forming four distinct chains, each built up of three crystallographically independent enH+ cations. Two of these chains are running parallel to [100], the other two are parallel to [010]. Based on this arrangement different centrosymmetric or non-centrosymmetric hydrogen bonding patterns are possible, but only in one chain the sequence of NH2 and NH3+ groups was determined by X-ray diffraction. 
  Reference    Z. Naturforsch. 53b, 1144—1148 (1998); received June 15 1998 
  Published    1998 
  Keywords    Selenoantimonates, Solvothermal Synthesis, Crystal Structure, Hydrogen Bonding 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1144.pdf 
 Identifier    ZNB-1998-53b-1144 
 Volume    53 
16Author    Markus Tampier, Dirk JohrendtRequires cookie*
 Title    B aC u 6G e2S8 -Ein Thiogermanat als Variante der L i3Bi-Struktur BaCu6Ge2S8 -A Thiogermanate as a Variant of the Li3Bi Structure  
 Abstract    BaCu6Ge2S8 was synthesized by direct reaction of the elements at 750°C and characteri­ zed by X-ray single crystal techniques. The thiogermanate crystallizes in a new orthorhombic structure type (a = 6.122(1) A, b = 12.084(3) A , c = 17.614(5) A; Pbcm, Z = 4). Isola­ ted [GeS4]4_ tetrahedra form a slightly distorted cubic face-centered (fee) arrangement. Ba-and Cu-atoms each occupy half the octahedral gaps (O G) of this " tetrahedra packing" . Fur­ ther Cu atoms fill the tetrahedral gaps (T G) completely. The compound can be written as Ba2<l/2 0 G,(Cu2)2<l/2<:)G)Cu8<7G)(GeS4)4 . Thus the structure o f BaCu6Ge2S8 can be derived from the Li^Bi type. The sulfur coordination o f the metal atoms (Cu tetrahedral or trigonal, Ba with CN 8) are realized by the spatial orientation of the [GeS4]4~ tetrahedra. Their centers nearly maintain the fcc-arrangement. This structure interpretation of BaCu6 Ge2S8 from the viewpoint o f a " filled tetrahedra packing" is discussed for further known thiogermanate compounds. 
  Reference    Z. Naturforsch. 53b, 1483—1488 (1998); eingegangen am 9. Juli 1998 
  Published    1998 
  Keywords    Chalcogenides, Germanium, Copper, Preparation, Crystal Structure 
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 Identifier    ZNB-1998-53b-1483 
 Volume    53 
17Author    Andre Wiesch3, Hauke Timmb, Karsten Bluhm3Requires cookie*
 Title    Uber CuDy2[B80 16] und CuHo2[B80 16]: Zwei neue "Metaborate" mit einem ^ [B80 16]g_-Anion On CuDy2[B80 16] and CuHo2[B80 16]: Two New "Metaborates" with a ^ [B80 16]8-Anion  
 Abstract    Nearly colourless single crystals of the compounds CuDy2 [B80 i 6] (I) and CuHo2[B80)6] (II) have been obtained by a B20 3 flux technique. They crystallize in the structure of CuTb2 [B80)6] (I) or in an orthorhombic variant (II). X-ray investigations on single crystals led to the space group C2h -P2!/c (Nr. 14) with lattice parameters a = 1025,5(10); b = 836,99(10); c = 621,2(8) pm, ß = 90.47(10)°; Z = 2 (I) and D^h -Pbam (Nr. 55) with a = 840,7(2), b = 616,6(2), c = 1022,0(2) pm, Z = 2 (II). The structures contain 1 [B80 16]8_ chains isolated from each other, which include tri-and tetracoordinated boron, T'fie chains consist of alternating twelve and eight-membered rings of boron and oxygen atoms connected by B 0 4 units. Dy,+ and H o 3+ are octacoordinated and Cu2+ is hexacoordinated in elongated octahedra by oxygen. The relation between these two structures is discussed. 
  Reference    (Z. Naturforsch. 53b, 1—4 [1998]; eingegangen am 23. Oktober 1997) 
  Published    1998 
  Keywords    Copper, Lanthanoids, Borate, Synthesis, Crystal Structure 
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 Identifier    ZNB-1998-53b-0001 
 Volume    53 
18Author    Lanthanoid Borates, A. Wiesch, K. BluhmRequires cookie*
 Title    CuHo2[B20 5]2* Ein unerwarteter Strukturtyp in der Reihe der Kupferlanthanoidborate CuHo2[B20 5]2: An Unexpected Structure Type in the Series of Copper  
 Abstract    Single crystals of the new compound CuHo2 [B20 5 ]2 were obtained by using a B20 3 flux technique with CuO and Ho20 3 at 1050 °C. X-ray investigations on single crystals led to the space group P 2,/c (Nr. 14) with lattice parameters a = 454.3(2); b = 726.0(4); c = 936.0(5) pm; ß = 90.77(1)°; Z = 2. The compound is isotypic to CuTb2[B20 5 ] 2 as well as to the gadolinite structure (FeY2 [BeSi05]2). The structure exhibits layer-like 2 [B20 5]4~, a two-dimensional anion consisting of edge sharing B 0 4 -tetrahedra, which form four-and eight-membered rings. The layers are connected by elongated C u06-octahedra and slightly distorted tetragonal LnOs-antiprisms. 
  Reference    (Z. Naturforsch. 53b, 5—8 [1998]; eingegangen am 23. Oktober 1997) 
  Published    1998 
  Keywords    Copper, Holmium, Borate, Synthesis, Crystal Structure 
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 Identifier    ZNB-1998-53b-0005 
 Volume    53 
19Author    Sabine Schlecht, Soheila Chitsaz, Bernhard Neumüller, Kurt DehnickeRequires cookie*
 Title    Die Kristallstrukturen des Diphenylphosphinsäureamids, Ph2P(0)NH 2, und seines Cäsiumsalzes [Cs{Ph2P(0)NH}] Crystal Structures of Diphenylphosphinic Acid Amide, Ph-,P(0)NH-, and of its Cesium Salt [Cs{Ph2P(0)NH}]  
 Abstract    The crystal structures of the monoclinic form of Ph2P(0)NH2 and of its cesium salt, [Cs{Ph2P(0)NH}l have been determined by X-ray methods. Ph2P(0)N H 2: Space group P2,/c, Z = 16, lattice dimensions (-80°C): a = 2530.2(3), b = 858.9(2), c = 2135.5(3) pm, ß = 110.78(1)°, R , = 0.055. Diphenylphosphinic acid amide forms dimeric molecules via N-H- • O hydrogen bonds, the dimeric units again are associated via hydrogen bonds to form infinite double chains along the crystallographic c axis. [Cs{Ph2P(0)NH}]: Space group Pccn, Z = 8 , lattice dimensions (-83°C): a = 1262.8(1), b = 2632.3(2), c = 769.1(1) pm , R\ = 0.024. The compound is associated via Cs-O and Cs-N contacts along the crystallographic [001] axis forming a tubular arrangement. There are no hydrogen bonds. 
  Reference    (Z. Naturforsch. 53b, 17—22 [1998]; eingegangen am 3. November 1997) 
  Published    1998 
  Keywords    Phosphinic Acid Amide, Cesium, Crystal Structure 
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 Identifier    ZNB-1998-53b-0017 
 Volume    53 
20Author    Wolfgang Jeitschko, HorstA. Mons, Ute Ch, ManfredH. Rodewald, MöllerRequires cookie*
 Title    The Crystal Structure of the Potential Ferroelectric Calcium Rhenate(VI, VII) CanRe4 0 24 and its Relation to the Structure of S rn 0 s40 24  
 Abstract    The title compound was prepared in well-crystallized form by thermal decomposition of Ca5Re20i2. Its structure was determined from single-crystal X-ray diffractometer data: /4 j, a = 1107.0(1), c = 1609.3(1) pm, Z = 4, R -0.056 for 4565 structure factors and 119 variable parameters. The calcium atoms occupy seven different sites with 8, 9, or 10 oxygen neighbors. The two different rhenium atoms are octahedrally coordinated by oxygen atoms with average Re-O distances of 193.1 and 187.7 pm for the six-and seven-valent rhenium atoms, respectively. The compound shows Curie-Weiss behavior with a magnetic moment of n exp = 1.15(±0.10) Pb per Re(VI) atom. The structure is closely related to that of Srn0s4024 which, however, crystallizes in the space group I2la. The difference between the two structures arises through the higher coordination numbers of the strontium atoms. It is suggested that at high temperature both compounds crystallize in the common higher symmetry space group I4\/a. Since CanRe4024 crystallizes in the pyroelectric class 4 this compound is expected to be ferroelectric. 
  Reference    (Z. Naturforsch. 53b, 31—36 [1998]; received October 17 1997) 
  Published    1998 
  Keywords    Crystal Structure, Ferroelectrics, Mixed Valence, Rhenates, Perrhenates 
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 Identifier    ZNB-1998-53b-0031 
 Volume    53 
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