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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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61	Author	Z. Naturforsch	Requires 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

62	Author	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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	Identifier	ZNB-1996-51b-0817
	Volume	51

63	Author	S. Frenzen, Hk Müller-Buschbaum	Requires 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

64	Author	R.Alf Feldhaus, JensK. Öppe, R. Ain, ErM. Attes	Requires 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

65	Author	D. Trinschek, M. Jansen	Requires 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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	Identifier	ZNB-1996-51b-0917
	Volume	51

66	Author	O. Laf Walter, G. Ottfried Hüttner, R. Ainer Kern	Requires 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

67	Author	C. W. Adewitz, HkM. Üller-Buschbaum	Requires 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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	Identifier	ZNB-1996-51b-0929
	Volume	51

68	Author	C. W. Erner1, E. K. Em Nitza, H. W. Orzalab, S. Trojanova	Requires 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

69	Author	Z. Naturforsch	Requires 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

70	Author	J. Beck	Requires 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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	Identifier	ZNB-1996-51b-1127
	Volume	51

71	Author	R. Buheitel, W. M. Ilius, W. Schnick	Requires 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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	Identifier	ZNB-1996-51b-1141
	Volume	51

72	Author	S. Frenzen, Hk, Müller-Buschbaum	Requires 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

73	Author	M. Wachhold, W. S. Sheldrick	Requires 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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	Identifier	ZNB-1996-51b-1235
	Volume	51

74	Author	Rainer Pöttgen, Gunter Kotzyba	Requires 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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	Identifier	ZNB-1996-51b-1248
	Volume	51

75	Author	C. Wadewitz, Hk Müller-Buschbaum	Requires 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

76	Author	Matthias Asbrand, Brigitte Eisenmann	Requires 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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	Identifier	ZNB-1996-51b-1301
	Volume	51

77	Author	Crystal, FrankH. Artm Anna, D. Ietrich, M. Ootz, Reinhard Schwesinger	Requires 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

78	Author	Hk Wedel, Müller-Buschbaum	Requires 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

79	Author	Ot, (.M = Niobium, Tantalum) B Wedel, Hk Miiller-Buschbaum	Requires 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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	TEI-XML for	default:Reihe_B/51/ZNB-1996-51b-1411.pdf
	Identifier	ZNB-1996-51b-1411
	Volume	51

80	Author	Mitra Ghassemzadeh, Klaus Harms, Kurt Dehnicke	Requires 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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	TEI-XML for	default:Reihe_B/51/ZNB-1996-51b-1423.pdf
	Identifier	ZNB-1996-51b-1423
	Volume	51

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