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1Author    Andreas Nägele3, Cynthia Dayb, Abdessadek Lachgarb, H.-Jürgen Meyer3, Sonderdruckanforderungen An, ProfH. Dr, -J MeyerRequires cookie*
 Title    Interpenetrierende Clusterstränge in der Kristallstruktur von Ko,77Nb6Cl15 Interpenetrating Cluster Chains in the Structure of Ko.77Nb6Cl15  
 Abstract    The solid state reaction of KCl, NbCl5 and Nb powder at 760 °C yielded black crystals of KNb6Cl15. The structure of the compound has been determ ined using single-crystal X-ray m e­ thods. KNb6Cli5 crystallizes in the orthorhombic space group Pmma (no. 51) with lattice constants a = 1780.1(2), b = 1341.4(1), and c = 925.5(1) pm, Z = 4, and R1 = 0.039 for all 2727 observed reflec­ tions. [ (N ^ C l ^ C l ^ 3'3]-anions in the structure are linked via two Cla a bridges to form one set of li­ near and one set of kinked chains along the cry­ stallographic c and a directions. Four remaining Cla a bridges interconnect both sets of chains to a three-dim ensional network. The potassium occu­ pancy on a 4k site was refined to a value of 0.384(3) consistent with the formula K0 77Nb6C li5. Ternäre Niobchloride des Formeltyps A Nb6Cl15 wurden bereits verschiedentlich beschrieben. Ver­ bindungen mit A = Li [1] und Na [2] kristallisieren kubisch (Ia3d) mit identischen Schweratomstruk-turen. Die Alkalim etall-Ionen Li (KZ = 4) und Na (KZ = 6) besetzen in den Strukturen A N b6Cl15 aber unterschiedliche Splitlagen und sind dyna­ misch fehlgeordnet. Die V ertreter mit A = In und TI [3] kristallisieren orthorhombisch (Pmma). Ihre Kationen befinden sich in zweifach überdachten, würfelförmigen Cl-Umgebungen (KZ = 10). Die Kenntnis des Formeltyps A N b6Cl15 mit schweren Alkalim etallen ist noch unvollständig. Einkristall­ 
  Reference    Z. Naturforsch. 56b, 1238—1240 (2001); eingegangen am 26. Juli 2001 
  Published    2001 
  Keywords    Niobium, Chloride, Cluster 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-1238_n.pdf 
 Identifier    ZNB-2001-56b-1238_n 
 Volume    56 
2Author    M. Schweizer, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kenntnis einer neuen ternären Phase Cu0)5Nbli5O3>7  
 Abstract    Single crystals of Cuo,5Nbi,503.7 were prepared and investigated by X-ray methods (a = 376.7, b = 507.3, c = 374,9 pm; ß = 101.5°; space group: P2i-Cg). The statistically occupied metal positions (Nb/Cu) have a trigonal prismatic O 2-surrounding. 
  Reference    Z. Naturforsch. 34b, 774—776 (1979); eingegangen am 7. März 1979 
  Published    1979 
  Keywords    Niobium, Oxygen, Crystal Structure 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0774.pdf 
 Identifier    ZNB-1979-34b-0774 
 Volume    34 
3Author    KurtO. Klepp, G. Erald GablRequires cookie*
 Title    Preparation and Crystal Structure O f € 8 4 ^ 2 8 ! i  
 Abstract    The new polychalcogenide Cs4N b2Su was pre­ pared from the melt. Cs4Nb7Sn is orthorhombic, 0 P68, s.g. Pca2, (N o.29), Z = 4 with a = 13.775(9) Ä , b = 8.043(9) A , c = 18.306(5) A. The crystal structure was determ ined from diffractometer data and refined to a conventional R of 0.052 
  Reference    Z. Naturforsch. 53b, 1236—1238 (1998); received April 14 1998 
  Published    1998 
  Keywords    Chalcogenide, Thioniobate, Polysulfide, Niobium, Cesium 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1236_n.pdf 
 Identifier    ZNB-1998-53b-1236_n 
 Volume    53 
4Author    A. N. Ägele3, E. A. Nokhinab, J. Sitarb, H.-JM. Eyer3, A. LachgarbRequires cookie*
 Title    Synthesis and Crystal Structures of ATi[Nb6Cli8] Compounds (A = K, Rb, Cs, In, Tl)  
 Abstract    New quaternary niobium cluster chlorides corresponding to the general formula ATi[Nb6Clis] (A = K, Rb, Cs, In, Tl) have been synthesized in sealed quartz tubes at 720 °C, starting from stoichiometric amounts of NbCls, niobium metal, TiCb, and AC1 (A = K, Rb, Cs), or In or Tl metals. The structures of RbTi[Nb6Clis] and CsTifNböClis] were determined using single­ crystal X-ray diffraction. RbTifNböClis] crystallizes in the rhombohedral crystal system, space group R3 (no. 148), Z = 3, with lattice parameters: a = 9.163(4), c = 25.014(14) A (hexagonal setting). The structure refinement converged to R] = 0.044 and wRi = 0.058 for all data. In this structure, discrete [NböClig]4-cluster units are linked by Rb+ and Ti3+ cations, located in a 12-coordinated anticubeoctahedral and octahedral chloride coordination environment, respectively. In contrast, CsTifNböClis] crystallizes in the trigonal crystal system, space group P31c (no. 163), Z = 2. The lattice parameters were determined to be a -9.1075(6), c = 17.0017(8) A. The structure refinement gives the reliability factors Ri = 0.029 and wRa = 0.063 for all data. The structure is built up of discrete octahedral [N bödis]4-cluster units, linked by Cs+ and Ti3+ cations which are located in a distorted hexagonal antiprismatic and octahedral chloride coordination environment, respectively. The structures of the compounds ATifNböClis] (A = K, In, Tl) were found to be isotypic with RbTi[NböCli8], and their unit cell parameters were refined using X-ray powder diffraction analysis. In tro d u ctio n 
  Reference    Z. Naturforsch. 55b, 139—144 (2000); received September 13 1999 
  Published    2000 
  Keywords    Niobium, Titanium, Cluster, Chlorides, Synthesis 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0139.pdf 
 Identifier    ZNB-2000-55b-0139 
 Volume    55 
5Author    H. Erbert, W. Roesky, Birgit Meller-Rehbein, M. Athias NoltemeyerRequires cookie*
 Title    Reactions of M e2NC(S)SN(SiMe3)2 with M etal Halides -Crystal Structure of M e2NCS2ZrCl3 * 3 Pyridine  
 Abstract    M e-,NC(S)SN(SiM e3)2 (1) reacts with TeCl4 and N bC lj to yield M e2N C (S)SN TeC l2 (4) and 
  Reference    Z. Naturforsch. 46b, 1117—1121 (1991); eingegangen am 14. Februar 1991 
  Published    1991 
  Keywords    Tellurium, Niobium, Zirconium, Hafnium, Complexes, X-Ray 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1117_n.pdf 
 Identifier    ZNB-1991-46b-1117_n 
 Volume    46 
6Author    S. Möhr, Hk Müller-BuschbaumRequires cookie*
 Title    Uber ein gemischtvalentes Oxoniobat mit planaren Polygonen um Niob und Barium: BaNb2+Nb2+0 6 On a Mixed Valent Oxoniobate Containing Planar Polygons A round Niobium and Barium: BaNb2 +N b^+0 6  
 Abstract    Single crystals of B aN b30 6 were prepared by C 0 2-LA SER high temperature technique. The compound crystallizes with trigonal symmetry C fv-R 3 m , a = 11.4333, c -3.4949Ä , Z = 3. The new structure type is characterized by planar N b 0 4 and planar B a 0 6 polygons. The results are discussed with respect to related compounds like Ca0.75 Nb3O6 or N aNb30 6. 
  Reference    Z. Naturforsch. 49b, 915 (1994); eingegangen am 17. Februar 1994 
  Published    1994 
  Keywords    Barium, Niobium, Oxide, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0915.pdf 
 Identifier    ZNB-1994-49b-0915 
 Volume    49 
7Author    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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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1407.pdf 
 Identifier    ZNB-1996-51b-1407 
 Volume    51 
8Author    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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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1411.pdf 
 Identifier    ZNB-1996-51b-1411 
 Volume    51 
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