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'Crystal Structure' in keywords Facet   Publication Year 1996  [X]
Facet   section ZfN Section B:Volume 051  [X]
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1996[X]
61Author    Z. NaturforschRequires cookie*
 Title    Ligand Influences on the Supramolecular Chemistry of Simple Gold(I) Complexes: Mononuclear (Isonitrile)gold(I) Complexes  
 Abstract    A series of (isonitrile)gold(I) complexes has been synthesized: (MeNC)AuX (X = Cl la, I lc), (f-BuNC)AuBr 2b. (PhNC)AuX (X = Cl 3a. Br 3b. I 3c. SCN 3d), (MesNC)AuCl 4a [mes=mesityl], and (Me0 C(0)CH2NC)AuX (X = Cl 5a. Br 5b. I 5c. SCN 5d). The chlorides were prepared by the reaction of (M e2S)AuCl with equimolar amounts (or with an excess) of the corresponding isonitrile. The bromides, iodides and thiocyanates were obtained from the reaction of (RNC)AuCl with K+X -(X = Br, I, SCN) in the two-phase system H2O/CH2CI2. The molecular and crystal structures of la. 2b. 3a-c, 4a, and 5a-c have been determined by X-ray diffraction methods. In the solid state the molecules are aggregated through short A u-A u contacts into dimers (4a and 5c), chains (la , 2b and 3a-c) or sheets (5a and 5b). The influence of the isonitrile and halide ligands on the type and strength of the intermolecular A u-A u contacts is discussed. I n tro d u c tio n 
  Reference    Z. Naturforsch. 51b, 790—800 (1996); received December 22 1995 
  Published    1996 
  Keywords    Gold(I) Complexes, Isonitrile Complexes, Auriophilicity, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0790.pdf 
 Identifier    ZNB-1996-51b-0790 
 Volume    51 
62Author    V-Requires cookie*
 Title    Zwei monokline Kupfer-Oxovanadate des Magnesiums mit geordneter Metallverteilung: /w-Mg2CuV20 8 und MgCu2V20 8. Ein Beitrag zur Dimorphie von Mg2CuV2Os Two Monoclinic Copper Oxovanadates of Magnesium Showing Ordered Metal Distribution: m-Mg9CuV-,08 and MgCu  
 Abstract    Single crystals of ra-Mg2CuV20 8 (I) and MgCu2V20 8 (II) have been prepared by solid state reactions. The orange (I) and dark red (II) crystals show monoclinic symmetry, space group C2h -P2,/c, (I): a = 6.167(3), b = 8.172(5), c = 6.400(8) Ä, ß = 116.22(3)°, Z = 2; (II): a = 6.453(1), b = 8.342(2), c = 11.517(2) Ä, ß = 90.44(2), Z = 4. Both compounds show ordered metal distributions and vanadium in tetrahedral coordination by oxygen. (I) is characterized by elongated C u06 octahedra and (II) by trigonal C u 0 5 bipyramids. ra-Mg2CuV20 8 is the low temperature form of the formerly investigated orthorhombic o-Mg2CuV2Ö8. Calculations of the Coulomb parts of the lattice energy of the two crystal forms are discussed. 
  Reference    Z. Naturforsch. 51b, 817—821 (1996); eingegangen am 4. Dezember 1995 
  Published    1996 
  Keywords    Magnesium, Copper, Vanadium Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0817.pdf 
 Identifier    ZNB-1996-51b-0817 
 Volume    51 
63Author    S. Frenzen, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kristallchemie eines Natrium-Cadmium-Oxoiridats: Na3Cd2lr06 On the Crystal Chemistry of a Sodium Cadmium Oxoiridate: Na3C d-Jr06  
 Abstract    Single crystals of Na3Cd2Ir0 6 have been prepared by crystallization from melts in closed silver tubes. The crystal structure was investigated by X-ray techniques. Na^Cd^IrOf, crystallizes with monoclinic symmetry, space group Cih-C2/m; a = 5.663(2), b = 9.783(3), c = 5.689(2) A, ß = 109.95(2)°, Z = 2. It is isotypic to M+5A7+0 6 (M = Li, Na; A = Re, Os) and shows relations to the sodium chloride structure in spite of an ordered distribution of Na+, Cd2+ and Ir5+. 
  Reference    Z. Naturforsch. 51b, 822—825 (1996); eingegangen am 29. November 1995 
  Published    1996 
  Keywords    Sodium, Cadmium, Iridium Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0822.pdf 
 Identifier    ZNB-1996-51b-0822 
 Volume    51 
64Author    R.Alf Feldhaus, JensK. Öppe, R. Ain, ErM. AttesRequires cookie*
 Title    Komplexe eines vierzehngliedrigen Tetraazadibenzo  
 Abstract    Makrocyclus. Strukturen des freien und zweifach protonierten Liganden und seiner Nickel(II)-, Kupfer(II)-, Zink(II)-und Palladium(II)-Komplexe C om plexes of a 14-M em bered N 4 D ibenzo M acrocycle. Crystal S tructures of the Free and D ip ro to n ated Ligand and of its N ickel(II), C o p p er(II), Z in k (II) and P alladium (II) C om plexes The synthesis and structural characterisation of complexes of the 14-membered macrocy­ clic trans-N4 dibenzo ligand 5,6,7,8,9,14.15,16,17,18-decahydrodibenzo[e,l][l,4, 8,1 l]-tetraaza-cyclotetradecine (L2) is described. The crystal structures of six compounds were determined by single crystal X-ray diffraction. The free ligand L2 has a saddle-shaped structure with short intramolecular hydrogen bonds. The N —N distances are 289 pm. The diprotonated species [H2L2]2+ has a different conformation due to intra-and intermolecular hydrogen bonds. TTie ligand is folded along an N —N axis in c/s-[Ni(L2)(H 20) 2]2+, but displays a saddle­ shaped structure in the Cu(II), Z n(II) and Pd(II) complexes with a more or less planar arrangem ent of the four N donor atoms. The metal atoms are incorporated within the macro-cyclic cavity in [Cu(L2)(CF3S03)]+ and [Pd(L2)]2+. The metal-to-nitrogen bond lengths herein are rather small. Zn(II) is five-coordinate in [Zn(L2)(Cl)]+. The coordination polyhedron is intermediate between a trigonal bipyramid and a square pyramid. In all complexes the metal-to-ligand distances originating at the nitrogen atoms in /^-position (with respect to the arom a­ tic ring) are significantly shorter then the donor bonds of the 1 anilinic' N atoms. 
  Reference    Z. Naturforsch. 51b, 869—878 (1996); eingegangen am 6. November 1995 
  Published    1996 
  Keywords    Macrocyclic N4-Donor Ligands, Transition Metal Complexes, Crystal Structures 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0869.pdf 
 Identifier    ZNB-1996-51b-0869 
 Volume    51 
65Author    D. Trinschek, M. JansenRequires cookie*
 Title    Eine neue M odifikation von Na2 Zn2 0 3 A New M odification o f N a2Z n20 3  
 Abstract    A new modification of Na2Zn20 3 has been synthesized via solid state reaction. According to the single crystal structure determination, the compound crystallizes in the space group P432|2 (No. 96) with lattice parameters a = 6.1812(2), c = 9.4479(4) A, Z = 4. The structure consists of Z n 0 4 tetrahedra connected via edges and corners forming a threedimensional network. The structure can be described as an distorted anti spinel. 
  Reference    Z. Naturforsch. 51b, 917—921 (1996); eingegangen am 24. November 1995 
  Published    1996 
  Keywords    Sodium Zincates, Crystal Structure, Anti Spinei Type 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0917.pdf 
 Identifier    ZNB-1996-51b-0917 
 Volume    51 
66Author    O. Laf Walter, G. Ottfried Hüttner, R. Ainer KernRequires cookie*
 Title    D a r s  
 Abstract    t e llu n g u n d C h a r a k t e r is ie r u n g v o n N (C H 2P P h 2)3, N (C H 2P P h 2)3M o (C O)3 u n d [ H N (C H 2P P h 2)3M o (C Ö) 3 ] B F 4 Preparation and Characterisation o f N (C H 2PPh-,)3, N (C H 2P P h i)3M o(C O)3 and [H N (CH 2PPh2)3M o(C O)3]BF4 The synthesis of N(CH2PPh2)3 (1) and its spectroscopic properties are reported. Reaction of N(CH2PPh2)3 with (CH3CN)3M o(CO)3 leads to N(CH 2PPh2)3M o(CO)3 (2). The cationic complex [HN(CH2PPh2)3Mo(CO)3]+ (3) is obtained by protonating the N atom of 2 with aqueous HBF4. The spectroscopic and structural properties of 2 and the cation 3 are compared. The results indicate an interaction of the ligand N atom and the Mo atom through space over more than 350 pm. It is shown from IR data that 2 
  Reference    Z. Naturforsch. 51b, 922—928 (1996); eingegangen am 18. Januar 1996 
  Published    1996 
  Keywords    Tripod Ligands, Phosphorus Ligands, Molybdenum Complexes, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0922.pdf 
 Identifier    ZNB-1996-51b-0922 
 Volume    51 
67Author    C. W. Adewitz, HkM. Üller-BuschbaumRequires cookie*
 Title    Synthese und Struktur eines Strontium -V anadyl-Phosphats: Sr2( V 0 ) (P 0 4)2 Synthesis and Structure o f a Strontium Vanadyl Phosphate: Sr2(V 0 )(P 0 4)2  
 Abstract    Dark green single crystals of Sr2(VO)P2Ox have been prepared by solid state reactions in closed quartz tubes. X-ray investigations led to monoclinic symmetry, space group C2h-I2/c/, a = 6.744(4), b = 15.866(4), c = 7.032(2) Ä, ß = 115.41(2), Z = 4. Sr2(VO)P2O s is isotypic to Sr2(VO)V2Os and shows V4+ in split positions. The split positions are in non-centric octahedral coordination forming a short vanadium to oxygen distance typical for the vanadyl group. The crystal chemistry of the monovanadyl orthophate Sr2(VO)P2O x is discussed considering related divanadyl phosphates. 
  Reference    Z. Naturforsch. 51b, 929—933 (1996); eingegangen am 17. Januar 1996 
  Published    1996 
  Keywords    Strontium, Vanadium, Phosphorus, Oxygen, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0929.pdf 
 Identifier    ZNB-1996-51b-0929 
 Volume    51 
68Author    C. W. Erner1, E. K. Em Nitza, H. W. Orzalab, S. TrojanovaRequires cookie*
 Title    Synthese und Kristallstruktur von Ba(H S04)2(H2S 0 4)3 und Sr(H S04)2(H2S 0 4) Synthesis and Structure o f B a (H S 0 4)2(H 2S 0 4)3 and S r(H S 0 4)2(H 2S 0 4)  
 Abstract    From the binary systems M 2S 0 4/H 2S 0 4 (M = Ba. Sr), two new hydrogen sulfates, (Ba(HS0 4)2(H 2S0 4)3 and S r(H S 04)2(H 2S 0 4), have been synthesized and structurally char­ acterized. Ba(HS0 4)2(H2S0 4)3 crystallizes in the orthorhombic space group P 2 12 12 , with unit cell parameters a = 4.680(1), b = 11.267(2), c = 29.188(6)A, Z = 4. B a 0 9 trigonal prismatic polyhedra with Ba-O distances of 2.68 -3.02 A from nine different S 0 4 tetrahedra are connected via common bases and build "isolated" columns consisting of O-S-O bridged double chains along the .r-axis. H S 0 4 and H2S 0 4 tetrahedra are linked via hydrogen bonds to form columns. S r(H S 04)i(H TS04) crystallizes in the triclinic space group P i with unit cell parameters a = 5.971(1), b = 8.468(2), c = 10.226(2)A, a = 81.71(3), ß = 83.30(3), 7 = 70.69(3)°, Z = 2. Sr is coordinated by nine oxygen atoms from seven different S 0 4 tetrahedra with S r-0 distances of 2.47 -2.84 A. The S r0 9 polyhedra build layers consisting of O-S-O bridged chains. Three crystallographically different S 0 4 tetrahedra are linked via hydrogen bonds to form a kind of flattened cylinder along the .v-axis. 
  Reference    Z. Naturforsch. 51b, 952—958 (1996); eingegangen am 15. Januar 1996 
  Published    1996 
  Keywords    Barium Hydrogen Sulfate Strontium Hydrogen Sulfate, Synthesis, Crystal Structure 
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 Identifier    ZNB-1996-51b-0952 
 Volume    51 
69Author    Z. NaturforschRequires cookie*
 Title    Zwei Metasilicate mit Vierer-Einfach-Ketten: Hochdrucksynthese und Strukturverfeinerung von Sr2(VO)2 Si4O i2 (Haradait) und Sr2(Ti0)2Si40 12  
 Abstract    Two M etasilicates w ith Vierer Single Chains: H igh-Pressure Synthesis and Structure R efinem ent o f Sr-,(V 0)2Si40 12 (H aradaite) and Sr2(TiO)2Si4O i2 Thom as Berger, K laus-Jürgen Range* Single crystals o f Sr2(V 0)2Si40 |2 could be obtained by high-pressure high-temperature reaction of a SrSiCVSiÖ 2/V 205 mixture in a modified Belt-type apparatus. The green crystals 
  Reference    Z. Naturforsch. 51b, 1099—1103 (1996); eingegangen am 1. März 1996 
  Published    1996 
  Keywords    Metasilicates, Vierer Single Chains, High-Pressure Synthesis, Crystal Structure 
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 Identifier    ZNB-1996-51b-1099 
 Volume    51 
70Author    J. BeckRequires cookie*
 Title    [TeCl3]+)3[MoCI6]2-(C  
 Abstract    The Reaction o f M oC 14 w ith TeCl4: Synthesis and Crystal Structure of Tris(trichlorotelluronium) H exachlorom olybdate(IV) Chloride, ([TeCl3]+)3[M oCl6]2-[ C l -] Red crystals of (T e C l^ M o C l^ C l) are obtained by reacting MoCl4 with TeCl4 in a 1:3 molar ratio in a sealed evacuated ampoule at 170°. The crystal structure determination (orthorhombic, space group Cmc2), a = 1541.6(2), b = 1268.1(1), c = 1180.6(1) pm) shows the presence of trigonal-pyramidal [TeCl3]+ ions, octahedral [MoCI(l]2-ions, and isolated C l-ions. The ions are linked by long Te-Cl bridges resulting in distorted TeCl(l octahedra. The octahedra are connected by joint edges and corners to zig-zag chains running along the polar c axis. 
  Reference    Z. Naturforsch. 51b, 1127—1131 (1996); eingegangen am 28. Februar 1996 
  Published    1996 
  Keywords    Trichlorotelluronium, Hexachloromolybdate(IV), Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1127.pdf 
 Identifier    ZNB-1996-51b-1127 
 Volume    51 
71Author    R. Buheitel, W. M. Ilius, W. SchnickRequires cookie*
 Title    Synthese und Kristallstruktur von Cl3 Ti[N(SiMe2 Cl)(SiMe2NH2)]  
 Abstract    Cl3Ti[N(SiMe2Cl)(SiM e2NH2)] is yielded by reaction of TiCl4 with two molecules ClMe2SiNHSiMe3. A single crystal structure determination (P 2 , //*, a = 747.12(2), b = 1294.1(3), c = 1496.7(3) pm, ß = 90.30(3)°, Z = 4) shows a planar four-membered ring Ti-N-Si-N as the central feature of the monomers formed by a weak coordinative bond of the NH2 group to the Ti atoms. The monomers are connected to eive dimers via two Cl bridses linked to the Ti atoms. 
  Reference    Z. Naturforsch. 51b, 1141—1144 (1996); eingegangen am 19. Februar 1996 
  Published    1996 
  Keywords    Silazanes, Nitrido Bridges, Precursor, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1141.pdf 
 Identifier    ZNB-1996-51b-1141 
 Volume    51 
72Author    S. Frenzen, Hk, Müller-BuschbaumRequires cookie*
 Title    Über Two Noble Metal Oxometallates Showing Sr4P t 0 6 Structure  
 Abstract    N aB a3R u 0 6 und N aB a3I r 0 6. Zwei Edelm etall-O xom etallate mit Sr4P t 0 6-Struktur On N aB a3R u 0 6 and N aB a3I r 0 6. Single crystals of NaBa?RuO(1 (I) and NaBa3IrOf1 (II) have been prepared by crystalli­ zation from melts in closed silver tubes. The cry­ stal structures were investigated by X-ray techni­ ques. Both compounds crystallize with trigonal (rhombohedral) symmetry, space group D f' ,-R3c, I: a = 10.107(2), c = 11.872(2) A. II: a = 10.128(2), c = 11.905(2) A. Z = 6. I and II are isostructural to the Sr4P t06 type. 
  Reference    Z. Naturforsch. 51b, 1204—1206 (1996); eingegangen am 26. Februar 1996 
  Published    1996 
  Keywords    Sodium Barium Ruthenium Iridium, Oxide, Crystal Structure 
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 Identifier    ZNB-1996-51b-1204_n 
 Volume    51 
73Author    M. Wachhold, W. S. SheldrickRequires cookie*
 Title    Methanolothermale Synthese von Cs4As2Te6, des ersten Alkalimetall- Telluridoarsenats mit As-As-und Te-Te-Bindungen Methanolothermal Synthesis of Cs4As2Te6, the First Alkali Metal Telluridoarsenate with As-As and Te-Te Bonds  
 Abstract    Reaction of Cs2C 0 3 and As2Te3 in methanol at 145°C affords the telluridoarsenate(II) Cs4As2Te(,. A trans conformation is observed for the centrosymmetric As2Te^~ anions, which consist of two t/>-tetrahedralo As(As)(Te2)Te units with a common As-As bond. The terminal As-Te distance of 2.554(2) A is much shorter than the As-Te distance of 2.691(2) A to the Te2 unit, which exhibits a Te-Te bond length of 2.744(2) A. Both of the independent cations are coordinated in an irregular manner by eight Te atoms. 
  Reference    Z. Naturforsch. 51b, 1235—1239 (1996); eingegangen am 29. April 1996 
  Published    1996 
  Keywords    Cesium, Telluridoarsenate(II), Methanolothermal Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1235.pdf 
 Identifier    ZNB-1996-51b-1235 
 Volume    51 
74Author    Rainer Pöttgen, Gunter KotzybaRequires cookie*
 Title    Ti2Ni2In, Zr2Co2In, and Zr2Pd2In -Intermetallic Compounds with Ordered U3Si2 and Zr3Al2 Type Structure  
 Abstract    T i:N i2ln, Zr2Co2ln, and Zr^Pd^In were synthesized by reacting the elements in an arc-melting furnace and subsequent annealing at 1070 K. The compounds were investigated by X-ray diffraction on both powders as well as single crystals. Z rC o iIn adopts the ordered U jSi: type structure: P4/mbm, a = 720.54(7), c = 331.59(4) pm. The structure consists of planar [Co2lnj layers with C02 dumb-bells which are separated by the zirconium atoms. Ti2Ni2ln and Z n P d 2ln crystallize with the ordered Z riA b type structure (space group P42/mnm), a superstructure of U?Si2: a = 694.3(2), c = 623.2(2) pm for TioNi^In and a = 746.0(1), c = 686.1(1) pm for Zr2Pd2ln. The Ni2 and Pd2 dumb-bells in the Ni2ln and Pd2ln layers of Ti2Ni2In and Z n P ^ I n are shifted from the mirror planes of the subcell resulting in puckered layers with weak interlayer Ni-Ni and Pd-Pd contacts, respectively. The indium atoms in these compounds occupy [Tis] and [Zr*] square prisms while the transition metal atoms are surrounded by [Tia] and [Zr6] trigonal prisms. These structural fragments are derived from the CsCl and AIB2 type structures. Chemical bonding in these intermetallic compounds is briefly discussed. Magnetic susceptibility measurements of compact polycrystalline samples indicate Pauli paramagnetism. 
  Reference    Z. Naturforsch. 51b, 1248—1254 (1996); received February 29 1996 
  Published    1996 
  Keywords    Intermetallic Compounds, Crystal Structure, Pauli Paramagnetism 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1248.pdf 
 Identifier    ZNB-1996-51b-1248 
 Volume    51 
75Author    C. Wadewitz, Hk Müller-BuschbaumRequires cookie*
 Title    Strukturelle Unterschiede zwischen Sr2(V 0)(A s04)2 und Ba2(V 0)(P 04)2 Strucural Differences between Sr2(V 0 )(A s0 4)2 and Ba2(V 0 )(P 0 4)2  
 Abstract    Two new alkaline earth vanadyl compounds, Sr2(V 0)(A s 0 4)2 (I) and Ba2(V 0)(P 0 4)2 (II), have been prepared by solid state reactions in closed quartz tubes and characterized by sin­ gle crystal X-ray diffraction methods. Crystal data: (I): monoclinic, C ,h -12/a, a = 6.873(2), b = 16.307(4), c = 7.196(2) A, ß = 115.67(2), Z = 4; (II): monoclinic, C^-I2, a = 9.471(2), b = 5.443(1), c = 16.972(4) Ä, ß = 101.65(2), Z = 4. (I) is isotypic to Sr2(V 0)V 20 8 and Sr2(V 0)(P 0 4)2. (II) shows significant differences to the strontium compounds as well as to Ba2(V 0)(V 0 4)2. The differences of the crystal chemistry and the similarity of (II) to Ba2(V 0)(P 0 4)2 H20 are discussed. 
  Reference    Z. Naturforsch. 51b, 1290—1294 (1996); eingegangen am 26. April 1996 
  Published    1996 
  Keywords    Barium, Strontium, Vanadium, Phosphorus, Arsenic, Oxygen, Crystal Structure 
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 Identifier    ZNB-1996-51b-1290 
 Volume    51 
76Author    Matthias Asbrand, Brigitte EisenmannRequires cookie*
 Title    Ein neues Baumuster für ein heteronukleares 11 -Valenzelektronensystem: gefaltete ^ [SnBi]2~-Zickzack-Ketten in der Struktur von K2[SnBi] A Novel Structure Pattern for a Heteronuclear 11 Valence Electron System: Folded ^ [SnBi]2" Zigzag Chains in the Structure of K2[SnBi]  
 Abstract    The compound K2[SnBi] was prepared by reaction of stoichiometric amounts of the elements in graphitized quartz ampoules. K2[SnBi] crystallizes in the orthorhombic system, space group Pbcm (No 57), Z = 4, with a = 680,4(3), b = 1339,(4) and c = 649,9(3) pm. The crystal structure of K2[SnBi] is characterized by folded infinite [SnBi] zigzag chains of alternating Sn and Bi atoms. The chains are bent at each Bi atom, the Sn atoms are located at the fold of the chain. Apart from the two covalent Sn-Bi bonds, each Sn atom has two additional collinear Sn-Sn contacts in direction of the fold of the chain which in terms of partial bonds can be assigned a bond order of one half. The repeating unit of the chain [Sn2Bi2]4_ is strongly related to the isoelectronic butterfly [Si4]6-in Ba3Si4. 
  Reference    Z. Naturforsch. 51b, 1301—1304 (1996); eingegangen am 8. März 1996 
  Published    1996 
  Keywords    Dipotassium Bismutidostannate, Preparation, Crystal Structure, Tin-Bismuth Chain 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1301.pdf 
 Identifier    ZNB-1996-51b-1301 
 Volume    51 
77Author    Crystal, FrankH. Artm Anna, D. Ietrich, M. Ootz, Reinhard SchwesingerRequires cookie*
 Title    Zur Kristallchemie ungeladener Phosphazen-Basen, I [1] Strukturen zweier Hydrate und eines Acetats von Tris(dimethylamino)methyliminophosphoran  
 Abstract    C hem istry o f U ncharged Phosphazene Bases, I [ 1 ] Structures o f Two H ydrates and an A cetate o f T ris(dim ethylam ino)m ethylim inophosphorane Two hydrates and an acetate of the uncharged, very strong phosphazene base tris(dimethylamino)methyliminophosphorane, (Me2N)3P=NMe (for short Me-P]), have been characterized by their crystal structures. A monohydrate, Me-P, • H:0 , mp. 3°C, is monoclinic 
  Reference    Z. Naturforsch. 51b, 1369—1374 (1996); eingegangen am 11. März 1996 
  Published    1996 
  Keywords    Crystal Structure, Hydrate, Hydrogen Bonding, Phosphazene, Uncharged Base 
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 Identifier    ZNB-1996-51b-1369 
 Volume    51 
78Author    Hk Wedel, Müller-BuschbaumRequires cookie*
 Title    Zur Kenntnis eines Barium-Oxoniobat-Tellurats: Ba2 Nb2TeOi<) On a Barium-Oxoniobate-Tellurate: Ba2Nb2TeO,0 B  
 Abstract    Single crystals of Ba^NbiTeO,,) have been prepared by solid state reactions in air. X-ray investigations led to orthorhom bic symmetry, space group D ^-Pbca, a = 7.242(4), b = 12.433(3), c = 9.932(3) Ä. Z = 4. Nb""'* and Te6+ show octahedral coordination by O '-. The crystal structure is characterized by planes of edge-and corner-sharing NbOh-and TeOfloctahedra. It is shown that in spite of nearly identical lattice constants of Ba2Nb2TeO |0 with compounds of the composition M() 5BaNbTe20 9 the so far unknown crystals of these substances may not be derived from the Ba^Nb^TeOio type. 
  Reference    Z. Naturforsch. 51b, 1407—1410 (1996); eingegangen am 12. April 1996 
  Published    1996 
  Keywords    Barium, Niobium, Tellurium Oxide, Crystal Structure 
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 Identifier    ZNB-1996-51b-1407 
 Volume    51 
79Author    Ot, (.M = Niobium, Tantalum) B Wedel, Hk Miiller-BuschbaumRequires cookie*
 Title    Zur Kristallchemie der Barium-Oxometallat-Tellurite: Ba2M6Te202i (M = Niob und Tantal) On the Crystal Chemistry of the Barium Oxometallate-Tellurites Ba-,M6Te  
 Abstract    Single crystals of Ba2Nb6Te20 2| (I) and Ba2Ta6Te20 2| (II) have been prepared by solid state reactions in air. X-ray investigations led to monoclinic symmetry, space group C 3h -C2/m, (I): a = 16.699(3), b = 5.671(2), c = 9.611(2) A, ß = 96.92(2), (II): a = 16.655(8), b = 5.667(2), c = 9.576(4) Ä, ß = 96.64(7), Z = 2. N b5+ or Tas+ show octahedral and Te4+ a one sided triangular coordination by O 2 -. The position and distance of the lone pair on Te4+ have been estimated by calculations of the Coulomb terms of the lattice energy. The polyhedron around Ba2+ may be described by a triply capped BaO^cube. The crystal structures are dominated by a ^ [Nb60 2l] l2~ network with incorporated Ba~+ and Te4+ ions. 
  Reference    Z. Naturforsch. 51b, 1411—1414 (1996); eingegangen am 28. März 1996 
  Published    1996 
  Keywords    Barium, Niobium, Tantalum, Tellurium, Crystal Structure 
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 Identifier    ZNB-1996-51b-1411 
 Volume    51 
80Author    Mitra Ghassemzadeh, Klaus Harms, Kurt DehnickeRequires cookie*
 Title    N ,N  
 Abstract    D im ethylharnstoff als chelatisierende Lewis-Säure: Synthese und K ristallstrukturen von PPh4[C l(H 2M e2N2CO)] und (PPh4)2[C l(H 2 M e2N2CO)]Cl N.N'-Dimethylurea as a Chelating Lewis Acid: Synthesis and Crystal Structures of PPh4[Cl(H2Me2N2CO)] and (PPh4)2[Cl(H2Me2N2CO)]Cl The title compounds have been prepared from tetraphenylphosphonium chloride and N,N'-dimethylurea in acetonitrile using different molar ratios of the educts. Both compounds were characterized by IR spectroscopy and by crystal structure determinations. PPh4[C l(H ,M e,N ,C O)l: Space group P i, Z = 4 ,a = 1021.8(2), b = 1192.7(2), c = 2143.9(4) pm, o = 87.21(3)°, ß = 85.95(3)°, = 74.16(3)° (-50°C). (PPh4MCl(H,Me-,N-,CO)]Cl: Space group P2,/n, Z = 4, a = 1138.4(2), b = 2855.4(3), c = 1394.0(1) pm, ß = 91.19(10)° (-60°C). In both compounds the N.N'-dimethylurea molecule acts as a chelating Lewis acid via two Cl -H hydrogen bonds forming nearly planar ClH 2N: C-six-membered heterocycles. 
  Reference    Z. Naturforsch. 51b, 1423—1427 (1996); eingegangen am 5. Juni 1996 
  Published    1996 
  Keywords    Chloride Complexes, NN'-Dimethylurea, Synthesis, Crystal Structure 
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 Identifier    ZNB-1996-51b-1423 
 Volume    51 
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