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181Author    Schaffrath, R. GruehnRequires cookie*
 Title     
 Abstract    Single crystals of the new oxochlorotantalate Nd 7 , 1 Ta 8 0 2H Cl f , could be obtained only by chemical transport reactions (T 2 —» T,; T 2 — 1000 °C, T, = 900 °C) with mixtures of Cl 2 /TaCl 5 as transport agent. NdTa0 4 was chosen as the starting material. A direct preparative route to Nd 7 ,,Ta s 0 2x Cl(, from binary and ternary components, however, was not successful. Nd 7 33 Ta H Oi x Clf, crystallizes in the space group Cmmm with a = 10.3381(8) Ä, b = 18.865(1) A, c — 3.9152(3) A; Z = 1. The structure was refined to R — 4.42%, R w = 2.76%. Main building units are pairs of edge-sharing Ta0 6 -octahedra which are connected with threefold capped trigonal prisms around Nd. Especially remarkable is one Nd position with an occupation factor of 0.833. The relationship of this new structure type with Nd 2 Ta 2 0 7 Cl 2 is considered. Furthermore, we have measured the magnetic susceptibilities of both Nd-compounds in a temperature range from 3,6 to 251,3 K. The results are compared with calculated data. 
  Reference    Z. Naturforsch. 43b, 1567—1574 (1988); eingegangen am 7. Juli 1988 
  Published    1988 
  Keywords    Oxochlorotantalates, Thermal Decomposition, Preparation, Chemical Transport Crystal Structure 
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 Identifier    ZNB-1988-43b-1567 
 Volume    43 
182Author    Abderraouf Khabou, Kurt Dehnicke, Kurt Findeisen, Farbenfabriken Bayer, Bayer-WerkD. Leverkusen, -5090 Leverkusen, Dieter FenskeRequires cookie*
 Title    Molybdännitridtrichlorid-2,3,3-trichloracrylnitril, [M0NCI3 * NC-C 2 C1 3 ] 2 Synthese, IR-Spektrum und Kristallstruktur Molybdenumnitridetrichloride-2,3,3-trichloroacrylnitrile, [MONC1 3 * NC—C 2 C1 3 ] 2 Synthesis, IR Spectrum, and Crystal Structure  
 Abstract    [MONC1 3 -NC —C 2 C1 3 ] 2 has been prepared by the reaction of MONC1 3 with trichloromethyl isocyanidedichloride, CC1 3 NCC1 2 , in CH 2 C1 2 suspension. The compound forms redbrown. mois-ture sensitive crystals, which were characterized by their IR spectrum as well as by a crystal structure determination (2482 independent observed reflexions, R = 0.048). Crystal data (-70 °C): Space group P2,/c, Z = 2, a = 674.2(2); b = 2128.2(11); c = 786.0(4) pm: ß = 102.81(3)°. [MONC1 3 • NC-C 2 C1 3 ] 2 forms centrosymmetric dimeric molecules via chloro bridges with Mo-Cl bond lengths of 240.7 and 276.0 pm. The longer MoCl bond of the MOC1 2 MO ring is caused by the trans influence of the nitride ligand; the MoN bond length of 167 pm corresponds with a triple bond. The 2,3,3-trichloroacrylnitrile ligand is bonded by its nitrogen atom with a bond length of Mo —N — 216 pm; the Mo-N=C—C sequence is almost linear with a remarkable short C—C bond of 143.0 pm. 
  Reference    Z. Naturforsch. 43b, 1616—1620 (1988); eingegangen am 19. Juli 1988 
  Published    1988 
  Keywords    Molybdenumnitridetrichloride-233-trichloroacrylnitrile, Synthesis, IR Spectra, Crystal Structure 
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 Identifier    ZNB-1988-43b-1616 
 Volume    43 
183Author    Christina Ergezinger, Frank Weller, Kurt DehnickeRequires cookie*
 Title    Amidinatokomplexe von Bor, Aluminium, Gallium, Indium und Zinn Die Kristallstrukturen von Ph-C(NSiMe 3 ) 2 AICI 2 und Ph-C(NSiMe 3 ) 2 SnCl 3 Amidinato Complexes of Boron, Aluminium, Gallium, Indium, and Tin The Crystal Structures of Ph-C(NSiMe 3 ) 2 AlCl 2 and Ph-C(NSiMe 3 ) 2 SnCl 3  
 Abstract    The trichlorides of aluminium, gallium, and indium, as well as boron tribromide and tin tetra-chloride react with N,N,N'-tris(trimethylsilyl)benzamidine to form the monomeric N.N'-bis-(trimethylsilyl)benzamidinato complexes Ph-C(NSiMe,) 2 MX 2 (M = B, Al. Ga, In; X = Cl, Br) and Ph —C(NSiMe 3) 2 SnCl 3 , respectively. All compounds have been characterized by their IR spectra, two of them by X-ray diffraction studies. Ph — C(NSiMei) 2 AlCl 2 : Space group C2/c, Z = 4, 1152 independent observed reflexions, R = 0.052. Lattice dimensions (19 °C): a = 1558.6(1), b = 1116.6(1), c = 1307.0(1) pm, ß = 115.17(1)°. The compound forms monomeric molecules, in which the aluminium atom is tetra-hedrally coordinated by two chlorine atoms and by the two nitrogen atoms of the benzamidinato chelate. Bond length A1N = 188.2 pm. Ph — C(NSiMe^) 2 SnCU: Space group PI, Z = 2, 3293 independent observed reflexions, R = 0.034. Lattice dimensions (19 °C): a = 980.1(1), b = 1025.9(1), c = 1230.5(2) pm. a = 68.40(1)°, ß = 87.71(1)°, y — 68.92(1)°. The compound forms monomeric molecules, in which the tin atom is five-coordinated by three chlorine atoms and by the two nitrogen atoms of the benzamidinato chelate. Bond lengths SnN = 213.5 and 215.2 pm. 
  Reference    Z. Naturforsch. 43b, 1621—1627 (1988); eingegangen am 18. August 1988 
  Published    1988 
  Keywords    N, N'Bis-(trimethylsilyl)amidinato Complexes, Synthesis, IR Spectra Crystal Structure 
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 Identifier    ZNB-1988-43b-1621 
 Volume    43 
184Author    K.-J Range, U. Klement, G. Döll, E. Bucher, J. R. BaumannRequires cookie*
 Title    The Crystal Structure of MnIn2Se4, a Ternary Layered Semiconductor  
 Abstract    Single crystals o f M nIn2Se4 have been grown by the chemical vapour phase transport technique using A1C13 as the transporting agent. The struc­ ture was refined to R = 0.064, Rn = 0.059 for 609 reflections. MnIn-,Se4 (R 3 m , hexagonal axes 
  Reference    Z. Naturforsch. 46b, 1122—1124 (1991); received February 21 1991 
  Published    1991 
  Keywords    M anganese Diindium Tetraselenide, Layered Semiconductor, Crystal Structure 
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 Identifier    ZNB-1991-46b-1122_n 
 Volume    46 
185Author    Rüdiger Staffel, Ulrich Müller, Andreas Ahle, K. Urt DehnickeRequires cookie*
 Title    Die Kristallstruktur von [Na(12-Krone-4)2+l2Se82 * (Se6, Se7) The Crystal Structure o f [Na(12-Crown-4)2+]2Se82 -(Se6, Se7)  
 Abstract    The title com pound was prepared from sodium polyselenide and 12-crown-4 in D M F solution in the presence o f cerium(IlI)chloride in the form o f black needles. The crystal structure determination by X-ray diffraction shows a partially disordered structure, in which the anionic units Se82-■ Se7 and Se82- • Se6 are present in the ratio 0.72/0.28. These units are as­ sociated to layers parallel to (1 0 0); the layers alternate with pseudohexagonal layers o f [N a(12-crown-4)2]+ ions. Space group P i, Z = 2, 3903 observed unique reflections, R = 0.114, w R = 0.084. Lattice dim ensions at -6 5 °C: a = 1247.9(3), b = 1367.8(8), c = 1660(1) pm, a = 94.65(5), ß = 98.94(3), y = 91.10(3)°. 
  Reference    Z. Naturforsch. 46b, 1287—1292 (1991); eingegangen am 8. April 1991 
  Published    1991 
  Keywords    Octaselenide, Cycloheptaselenium, Cyclohexaselenium, Synthesis, Crystal Structure 
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 Identifier    ZNB-1991-46b-1287 
 Volume    46 
186Author    Klaus-Jürgen Range, Franz Rau, Ulrich KlementRequires cookie*
 Title    Hochdrucksynthese und Strukturverfeinerung von S r V 0 3, Sr2V 0 4 und Sr3V20 7 High-Pressure Synthesis and Structure Refinement of S rV 03, Sr2V 0 4, and Sr3V20 7  
 Abstract    Single crystals o f S rV 0 3, Sr2V 0 4 and Sr3V20 7 have been obtained by high-pressure reactions in a m odified belt-type apparatus. The crystal structures, refined from diffractometer data, are as follows; S rV 03, perovskite type. Pm 3m, a = 3.8408(3) A, R = 0.017, /?w = 0.018, com posi­ tion from occupancy refinement o f oxygen positions SrV O ,93(2); Sr2V 0 4, K 2N iF 4 type, I 4/m m m , a = 3.837(1), c = 12.569(1) Ä, R = 0.014, R w = 0.017; Sr3V ,0 7, Sr3T i,0 7 type, I 4/m m m , a = 3.839(1), c = 20.262(2) Ä, R = 0.020, R w = 0.029. 
  Reference    Z. Naturforsch. 46b, 1315—1318 (1991); eingegangen am 10. Mai 1991 
  Published    1991 
  Keywords    Strontium Vanadium(IV) Oxides, High-Pressure Synthesis, Crystal Structure 
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 Identifier    ZNB-1991-46b-1315 
 Volume    46 
187Author    F.-D Martin, Hk Müller-BuschbaumRequires cookie*
 Title    Synthese und Kristallstruktur von NaM g1?64Cu0 ,36^3^10 Synthesis and Crystal Structure of NaM glt64Cuoi36V 3 0 1o  
 Abstract    Single crystals of NaMg] 64Cu().36V 3O 10 have been prepared by heating mixtures of Na2C 0 3, M gC 03, CuO and V 20 5 above the melting point. The yellow crystals show triclinic symmetry, space group Cj-PT, a = 6.726(8), b = 6.743(7), c = 9.625(2) Ä , a = 100.705(9), ß -104.57(1), y = 101.700(9)°, Z = 2. N aM g164Cu0.36V 3O 10 represents a new structure type showing V 3O 10 groups, a statistical distribution of Mg2+ and Cu2+ on two point positions, and N a+ in an irregular coordination. 
  Reference    Z. Naturforsch. 49b, 1329—1333 (1994); eingegangen am 6. Mai 1994 
  Published    1994 
  Keywords    Sodium Magnesium, Copper, Vanadium Oxide, Crystal Structure 
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 Identifier    ZNB-1994-49b-1329 
 Volume    49 
188Author    YueQing Zheng, Arnold AdamRequires cookie*
 Title    Ein neues Carbonat mit Baylissit-Struktur: Rb2[M g(C 03)2(H 20 )4] A New Carbonate with Baylissite Structure: Rb2 [Mg(C0 3 )2(H 2 0 )4]  
 Abstract    The new complex carbonate Rb2[M g (C 0 3)2(HoC))4] crystallizes in the Baylissite-tvpe structure with a = 1130,4(3), b = 641,9(1), c = 703,3(2) pm, ß = 99,62(1)°, V EZ = 503,2(2), space group P2l/n (No. 14) and Z = 2. In comparison with the isostructural potassium compound the cell dimensions increase in b-and c-and decrease in ö-direction. This effect depends on the greater coordination number of Rb+ and the rigidity of strong hydrogen bonds. The carbonate anion exhibits significant deviations from D 3h-symmetry (C -O : 127,1(5)-130,2(5) pm, Z_ O -C -O : 117.9(4)-121,1(3)°). 
  Reference    Z. Naturforsch. 49b, 1368—1372 (1994); eingegangen am 25. April 1994 
  Published    1994 
  Keywords    M etal-Carbonato-Complex, Baylissite Type, Synthesis, Crystal Structure 
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 Identifier    ZNB-1994-49b-1368 
 Volume    49 
189Author    Stefan Peschel, Dietrich BabelRequires cookie*
 Title    Zur Kristallstruktur der Cyanoelpasolithe [N(CH3)4]2CsCo(CN)6 und [H3NCH3]2NaFe(CN)6 Concerning the Crystal Structures of the Cyano-Elpasolites [N(CH3 )4]2CsCo(CN) 6 and [H3NCH3]2NaFe(CN) 6  
 Abstract    Single crystals of the cyano com plexes [N (C H 3)4]2C sC o(C N)6 and [H3NCH 3]2N aFe(C N)6 were prepared and their structures determined by X-ray methods. The cobalt compound is monoclinic, a -885.5(1), b = 892.6(2), c = 1259.9(5) pm, ß = 90.29(4)°, space group 12Im, Z = 2; R l = 0.048 for 861 independent reflections. The resulting average distances in the nearly undistorted octahedra are C o -C = 189.8, C -N = 114.1, C s -N = 325.6 pm. The iron compound exhibits a cubic elpasolite type structure, a = 1105.2(1) pm, space group Fm 3m , Z = 4; R l = 0.040 for 127 independent reflections; F e -C = 193.4(6), N a -N = 247.7(8) pm. The orientation of the librating tetramethyl-ammonium group within the cages of the cobalt compound and the disorder of the monomethyl-ammonium cation around the special site (1/4, 1/4, 1/4) of the iron complex are discussed. 
  Reference    Z. Naturforsch. 49b, 1373—1380 (1994); eingegangen am 31. März 1994 
  Published    1994 
  Keywords    Hexacyanometallates(III), Crystal Structure, Elpasolite 
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 Identifier    ZNB-1994-49b-1373 
 Volume    49 
190Author    F.-D Martin, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kenntnis von K4CuV50 15C1 On K4 CuV5 0 1 5 C1  
 Abstract    Single crystals of K4CuV50 15C1 were prepared by crystallization from the melt. The yellow brown crystals show tetragonal symmetry, space group C 4-P 4, a = 8.8690, c = 5.4196 A , Z = 1. K4CuV50 15C1 is strongly related to KBaCuV20 7Cl and K2V 30 8. V (l) shows V 20 7 double tetrahedra connected by square V 0 5 and C u 0 4Cl pyramids. The crystal structure is discussed with respect to the related compounds. 
  Reference    Z. Naturforsch. 49b, 1459—1462 (1994); eingegangen am 9. Juni 1994 
  Published    1994 
  Keywords    Potassium, Copper, Vanadium Oxide-Chloride, Crystal Structure 
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 Identifier    ZNB-1994-49b-1459 
 Volume    49 
191Author    D. Frerichs, Hk Müller-BuschbaumRequires cookie*
 Title    Ein Beitrag zur Kristallchemie von Verbindungen mit Johillerit-Struktur: On the Crystal Chemistry of Compounds with Johillerite Structure: KCo3 Cu(As2 5 8 V0 4 2 )O i2  
 Abstract    Single crystals of KCo3Cu(As2.58Vo42) 0 12 were prepared by solid state reactions below the melting point of the reaction mixture (K 2C 0 3, CuO, CoC20 4, V 20 5 and 3 A s20 5 -5 H 20) . It crystallizes with m onoclinic symmetry, space group C |h-C 2 lc, a = 12.207, b = 12.730, c = 6.811 A , ß = 113.69°, Z -4. The structure type is characterized by isolated twisted-square C u 0 4-polygons, C o 0 6-octahedra and a special 4+4-coordination o f the potassium ion. A s5+ and V*+ are in tetrahedral coordination with a partly statistical distribution of these ions. 
  Reference    Z. Naturforsch. 49b, 1463—1466 (1994); eingegangen am 13. Juni 1994 
  Published    1994 
  Keywords    Potassium, Cobalt, Arsenic, Vanadium Oxide, Crystal Structure 
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 Identifier    ZNB-1994-49b-1463 
 Volume    49 
192Author    Christian Robl, VolkerG. ÖbnerRequires cookie*
 Title    Kristallstruktur und hydrothermale Darstellung der Schichtverbindung B e2( P 0 4)(0 H )* 2 H 20 Crystal Structure and Hydrotherm al Synthesis of the Layered Com pound Be2 ( P 0 4 ) (0 H ) * 2 H 20  
 Abstract    Colourless monoclinic single crystals of B e2(P 0 4) (0 H) -2 H 20 (space group P 2 Jn) have been prepared under hydrothermal conditions in aqueous solution. Crystal data: a = 631.7(1), b = 1108.7(2), c = 812.7(2) pm, ß = 105.83(2)°, 910 unique reflections, 108 parameters, Rg = 0.0233. P is tetrahedrally coordinated by 4 oxygen atoms. Each of the two crystallographically unique Be atoms has two phosphate oxygen atoms, one water molecule, and one OH group as coordination partners. The tetrahedra share common vertices and build up a two-dim ensionally infinite pattern. The OH group links the two unique Be centered tetrahedra. Loss of water com m ences at 300 °C and is finished at 580 °C. 
  Reference    Z. Naturforsch. 49b, 1499—1502 (1994); eingegangen am 23. Juni 1994 
  Published    1994 
  Keywords    Beryllophosphate, Crystal Structure, Differential Thermal Analysis, Layered Compound 
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 Identifier    ZNB-1994-49b-1499 
 Volume    49 
193Author    S. Mann, M. JansenRequires cookie*
 Title    Ein neuer Zugang zu ionischen Thionylimiden. Einkristallstruktur von N(CH3)4NSO A New Access to Ionic Thionylimides. Single Crystal Structure of N(CH3)4NSO  
 Abstract    Single crystals of N (C H 3)4NSO have been prepared via ion exchange from RbNSO or CsNSO and tetraalkylammonium halides in liquid ammonia and investigated by X-ray single crystal techniques (14, a = 1137.6(1), c = 1134.9(2) pm, Z = 8, T = -1 0 0 °C). The crystal structure of N (C H 3)4NSO is related to the CsCl-type of structure. Using the same preparative route N M e3B zN SO has been obtained. Its lattice powder data (orthorhombic primitive; a = 896.3(2) 
  Reference    Z. Naturforsch. 49b, 1503—1506 (1994); eingegangen am 13. Juni 1994 
  Published    1994 
  Keywords    Thionylimide, Ion Exchange, Tetramethylammonium, Crystal Structure, Benzyltrimethylammonium 
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 Identifier    ZNB-1994-49b-1503 
 Volume    49 
194Author    Oliver Heilmann, Hans-Dieter Hausen, Wolfgang KaimRequires cookie*
 Title      
 Abstract    The crystal structure determination of the new rhodium(III)-complex [(DM L)(C5Me5)ClRh](PF6). DML = 1,3-dimethyllumazine, reveals 0 4,N5 coordination of the metal to DML with not very different bond lengths of 213.0(2) pm (R h -N) and 219.2(2) pm (R h -O). This result stands in contrast to the previously reported structure of a cationic dihydrobiopterin bound to [Mo(0)C13] which exhibited a very unsymmetrical chelate ar­ rangement. Chemical and electrochemical two-electron reduction of the Rh(III) complex led to a very labile Rh(I) species (DM L)(C5Me5)Rh which is distinguished by an intense charge transfer band in the visible. The results confirm the characterization of DML as a weak o donor In acceptor ligand with a rather low-lying tc* orbital. 
  Reference    Z. Naturforsch. 49b, 1554—1560 (1994); received July 8 1994 
  Published    1994 
  Keywords    Crystal Structure, Pteridine Heterocycles, Rhodium, Electrochemistry, Coordination 
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 Identifier    ZNB-1994-49b-1554 
 Volume    49 
195Author    M. Arkus Wieber, Stefan Lang, StefanRalph Rohse, Christian Habersack, BurschkaRequires cookie*
 Title    Synthese und Kristallstruktur von Triphenyltelluroniumsulfid Synthesis and Crystal Structure of Triphenyltelluroniumsulfide  
 Abstract    The synthesis of triphenyltelluroniumsulfide (Ph3TeS)4 is described together with a NMR-spectroscopic characterization. The structure of the title compound was determined by single crystal X-ray diffraction. Crystals of triphenyltelluroniumsulfide are triclinic (space group P I) with the cell parameters a = 1178.0(3) pm. b = 1295.8(6) pm. c = 1298.7(4) pm, a = 77.67(3)°, ß = 82.18(2)°, y = 66.00(2)° (V = 1766(1) x 106 pm3) and Z = 2. The compound appears to form a step-like structure of two [Ph3TeS]2 units and crystallizes with two m ole­ cules of CH2C12 per unit cell. 
  Reference    Z. Naturforsch. 49b, 1654—1658 (1994); eingegangen am 5. Mai 1994 
  Published    1994 
  Keywords    Triphenyltelluroniumsulfide, Synthesis, NMR Data, Crystal Structure, Secondary Bonding 
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 Identifier    ZNB-1994-49b-1654 
 Volume    49 
196Author    Z. NaturforschRequires cookie*
 Title    K34[Zn2oIn85]: Eine ternäre Auffüllungsvariante des /?-rhomboedrischen Bors  
 Abstract    In the crystal structure of K34[Zn2()In85] (a = 1827.7(5) pm, c = 3980.5(8) pm, R3m , Nr. 166, Z = 3, R1 = 0.056, wR2 = 0.124) the In and Zn atoms form the /3-rhombohedral boron structure. The structure contains In84 Samson polyhedra, and clusters of 18 In and 10 Zn atoms, forming three In12 icosahedra sharing two common triangular faces. The potassium atoms occupy the centres of truncated tetrahedra -forming the Samson polyhedra -and Kasper polyhedra. 
  Reference    (Z. Naturforsch. 50b, 23 [1995]; eingegangen am 16. Juni 1994) 
  Published    1995 
  Keywords    Crystal Structure, Intermetallic Compound, Potassium, Zinc, Indium 
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 Identifier    ZNB-1995-50b-0023 
 Volume    50 
197Author    Ch Rabbow, O. Sfreddo, Hk Müller-BuschbaumRequires cookie*
 Title    Uber ein Barium-Lanthanoid-Oxozinkat-Platinat(IV): Ba17Ybi6Zn8Pt40 57 On a Barium Rare Earth Oxozincate-Platinate(IV): B a j 7 Yb 16Z n8Pt40 57  
 Abstract    Reactions of B a C 0 3, ZnO and Yb20 3 mixtures at temperatures up to 1300 °C using plati­ num crucibles led to yellow needles of B a17Y b 16Zn8Pt40 57. The compound crystallizes with a hitherto unknown tetragonal crystal structure, space group C-4h-I4/m, a = 22.731(1), c = 5.682(1) A , Z = 2. The crystal structure is characterized by P t 0 6 octahedra and tetragonal Z n 0 5 pyramids. Yb3+ shows a mono-capped trigonal prismatic coordination and Ba2+ several different coordination environments (C .N = 9 to 10, by O2"). The relationship to the Ba5Ln8M40 2i type is discussed. 
  Reference    Z. Naturforsch. 51b, 220 (1996); eingegangen am 10. Juli 1995 
  Published    1996 
  Keywords    Barium, Rare Earth, Zinc, Platinum, Crystal Structure 
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 Identifier    ZNB-1996-51b-0220 
 Volume    51 
198Author    S. Frenzen, Hk Müller-BuschbaumRequires cookie*
 Title    Uber ein neues Oxoiridat(V) vom Sr4P t0 6-Typ: NaSr3Ir06 On a New O xoiridate(V) of the Sr4P t 0 6 Type: NaSr3I r 0 6  
 Abstract    Single crystals of NaSr3I r 0 6 have been prepared by heating mixtures of Na20 2, SrO and iridium in closed silver tubes and were investigated by X-ray techniques^ NaSr3I r 0 6 crystal­ lizes with trigonal (rhombohedral) symmetry in the space group D 3d-R 3 c , a = 9.636(2), c = 11.556(3) A , Z = 6, and is isotypic to compounds of the Sr4P t 0 6 type. The substitution of Sr2+ by N a+ in NaSr3I r 0 6 led to an ordered metal distribution and an increase of the oxida­ tion state from IrIV to Irv. 
  Reference    Z. Naturforsch. 51b, 225 (1996); eingegangen am 2. Juni 1995 
  Published    1996 
  Keywords    Sodium, Strontium, Iridium Oxide, Crystal Structure 
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 Identifier    ZNB-1996-51b-0225 
 Volume    51 
199Author    Hk Müller-Buschbaum, St GallinatRequires cookie*
 Title    Zur Kristallchemie von CuDyMo20 8 und CuYbMo20 8 On the Crystal Chemistry o f C uD yM o20 8 and CuYbM o2O g  
 Abstract    Single crystals o f (I) C uD yM o20 8 and (II) CuYbM o20 8 have been prepared by crystalli­ sation from melts. Both com pounds crystallize with orthorhombic symmetry, space group D 2 5h~Pbca with (I): a = 10.195(1), b = 9.721(2), c = 14.563(3); (II): a = 10.094(6), b = 9.628(9), c = 14.467(8) A , Z = 8. The crystal structure is characterized by a triangular C u 0 3-polygon, a square antiprismatic coordination around the Rare Earth ions and the typical M o 0 4 tetra­ hedra. 
  Reference    Z. Naturforsch. 51b, 240 (1996); eingegangen am 18. Mai 1995 
  Published    1996 
  Keywords    Copper, Rare Earth M olybdenum Oxide, Crystal Structure 
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 Identifier    ZNB-1996-51b-0240 
 Volume    51 
200Author    A. Nne, M. Witte, Wolfgang JeitschkoRequires cookie*
 Title    Preparation and Crystal Structure of the Isotypic Carbides Ln3.67TC6 (Ln = rare earth elements; T = Mn, Fe, Ru) and Eu3 ,i6NiC6  
 Abstract    The 14 carbides Ln367MnC6 (Ln = La-Nd) and Ln367TC6 (Ln = La-Nd, Sm; T = Fe, Ru) were prepared from the elem ental components by arc-melting and subsequent annealing. Eu3 16N iC 6 was obtained from a lithium flux. The crystal structures of these nearly isotypic, hexagonal compounds (P63/m, Z = 2) were determined from single-crystal X-ray data; La3 67. FeC6: a = 878.7(2), c = 535.1(1) pm, R = 0.052 for 548 structure factors and 25 variable parameters; Eu316NiC6: a -860.0(1), c = 548.2(2) pm, R = 0.015 for 606 structure factors and 25 variables. The structures differ from the previously reported Gd3Mn2C6 structure by the occupancy of one manganese position by rare earth atoms. Since the lanthanum atoms are larger than the manganese atoms, only two thirds o f these manganese positions can be occupied by the lanthanum atoms in La3 67FeC6. Eu316NiC6 has similar atomic positions. The C-C bond distances in the C2 pairs are 130(2) and 126.5(5) pm in the La and Eu compounds, respectively. Magnetic susceptibility measurements with a SQ U ID m agnetom eter indicate La3 67FeC6 to be Pauli paramagnetic. A test for superconductivity was negative down to 3 K. 
  Reference    Z. Naturforsch. 51b, 249 (1996); received June 12 1995 
  Published    1996 
  Keywords    Lithium Flux, Crystal Structure, Ternary Carbides with C2 Pairs 
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 Identifier    ZNB-1996-51b-0249 
 Volume    51 
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