| 261 | Author
| Tsutomu Okuda, Yoshihiro Kinoshita, Hiromitsu Terao, Koji Yamada | Requires cookie* | | Title
| Structure and Bonding of Bromoantimonate (III) Complexes with Unusual Valency by Means of NQR and Powder X-Ray Diffraction  | | | Abstract
| NQR and powder X-ray diffraction were observed for several bromoantimonate (III) complexes which contain C"H2n+ jNF^ (n = 1 -3) or (C"H2lt + 1)2N H 2 (n = 1 -4) as a cation. The bond character, anion structure, crystal structure, and phase transition are discussed on the basis of the three-center-four-electron bond. A good correlation was found between the halogen NQR frequency and the Sb-X bond length. | | |
Reference
| Z. Naturforsch. 49a, 185—192 (1994); received July 23 1993 | | |
Published
| 1994 | | |
Keywords
| 81Br NQR, Temperature dependence, Phase transition, Crystal structure | | |
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| default:Reihe_A/49/ZNA-1994-49a-0185.pdf | | | Identifier
| ZNA-1994-49a-0185 | | | Volume
| 49 | |
262 | Author
| Jacek Zaleski | Requires cookie* | | Title
| Crystal Structure and Phase Transitions of [C(NH2)3]3Sb2C l9 * 0.9 H 20 A dam Pietraszko  | | | Abstract
| The room temperature structure of [C(NH2)3]3Sb2C l9 ■ 0.9 H 20 (GNCA) was solved. It crystal lizes in the monoclinic C2/c space group with a = 15.275, b = 8.794, c = 17.904 (in Ä), ß = 96.40°, V = 2390 Ä 3, Z = 4. Refinement of the atomic parameters by a least squares methods gave R = 0.042, wR = 0.039 for 1958 reflections with F>4ct(F). The structure consists of polyanionic (Sb2Cl|_)n layers built of deformed corner connected SbX^-octahedra. Two crystallographically inequivalent guanidinium cations are present, one situated between polyanionic layers, the other one together with a disordered water molecule inside cavities formed by polyanions. Temperature X-ray scattering experiments together with DSC studies were carried out above room temperature. Temperature dependence of the lattice parameters between 300 K and 380 K was determined and a phase transition of mixed order at 364 K was revealed. | | |
Reference
| Z. Naturforsch. 49a, 895—901 (1994); received June 7 1994 | | |
Published
| 1994 | | |
Keywords
| Guanidinium, Chloroantimonate, Crystal structure, Phase transition, DSC | | |
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| default:Reihe_A/49/ZNA-1994-49a-0895.pdf | | | Identifier
| ZNA-1994-49a-0895 | | | Volume
| 49 | |
263 | Author
| Hiroyuki Ishida, Hironobu Maeda, Akiko Hirano, Tamotsu Fujimoto, Yoshihiro Kubozono, Setsuo Kashino, Shuichi Emura | Requires cookie* | | Title
| E X A F S S tu d y o n th e P h a s e T r a n s itio n ( P h a s e a ' -5) in C H 3 N H 3 I  | | | Abstract
| The local structure of CH3NH3I around the I" ion in Phase a 'and 8 was studied by iodine K-edge EXAFS. The crystal structure in Phase a ' was redetermined by single crystal X-ray diffraction. The Debye-Waller factor <r(2) derived from EXAFS spectra shows an anomalous behavior around the order-disorder transition temperature from Phase 8 to a '. The phase transition has been interpreted as the disordering process which involves not only the H atoms but also the C atoms in the cation. | | |
Reference
| Z. Naturforsch. 50a, 876—880 (1995); received June 16 1995 | | |
Published
| 1995 | | |
Keywords
| Crystal structure, EXAFS, Phase transition, X-ray diffraction | | |
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| default:Reihe_A/50/ZNA-1995-50a-0876.pdf | | | Identifier
| ZNA-1995-50a-0876 | | | Volume
| 50 | |
264 | Author
| Hiroyuki Ishida, Hiroshi Ono, Ryuichi Ikeda | Requires cookie* | | Title
| Crystal Structure of the High-temperature Solid Phases of Choline Tetrafluoroborate and Iodide  | | | Abstract
| The crystal structure of the highest-and second highest-temperature solid phases of choline tetrafluoroborate and iodide was determined by X-ray powder diffraction. The structure in the highest-temperature phase of both salts is NaCl-type cubic (a = 10.16(2) Ä, Z = 4 for tetrafluorobo-rate; a = 10.08(2) A, Z = 4 for iodide). The second highest-temperature phase of tetrafluoroborate and iodide is CsCl-type cubic (a = 6.198(6) Ä and Z = 1) and tetragonal (a = 8.706(2) A, c = 6.144(6) Ä, and Z = 2), respectively. DSC was carried out for the iodide, where the presence of three solid-solid phase transitions was confirmed. Enthalpy and entropy changes of these transitions were evaluated. | | |
Reference
| Z. Naturforsch. 52a, 679—680 (1997); received June 17 1997 | | |
Published
| 1997 | | |
Keywords
| Crystal structure, Powder X-ray diffraction, Phase transition | | |
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| default:Reihe_A/52/ZNA-1997-52a-0679_n.pdf | | | Identifier
| ZNA-1997-52a-0679_n | | | Volume
| 52 | |
266 | Author
| Hideta Ishihara, Keizo Horiuchi, ThorstenM. Gesing, Shi-Qi Dou, J.-Christian Buhl, Hiromitsu Terao | Requires cookie* | | Title
| I NQR and Crystal Structure Studies of [N(CH 3 ) 4 ] 2 CdI 4  | | | Abstract
| The temperature dependence of 127 1 NQR and DSC as well as the crystal structure at room temperature of the title compound were determined. This compound shows a first-order phase transition of an order-disorder type at 245 K. Eight 127 I(i^i: m = ±5 <-+ ±|) NQR lines of 79. corresponding eight 127 I(^ 2 : m = ±| <-» • ±|) NQR lines were observed at liquid nitrogen temperature. Three 127 I(^i) NQR lines wfth an intensity ratio of 1:1:2 in the order of decreasing frequency were observed just above the transition point and two NQR lines except for the middle-frequency line disappeared around room temperature. This temperature behavior of NQR lines is very similar to that observed in [N(CH 3)4] 2 Hgl4. Another first-order phase transition takes place at 527 K. The structure of the room-temperature phase was redetermined: orthorhombic, Pnma, Z = 4, a = 1342.8(3), b = 975.7(2), c = 1696.5(3) pm. The NQR result of three lines with an intensity ratio of 1:1:2 is in agreement with this structure. The thermal displacement parameters of atoms in both cations and anions are large. | | |
Reference
| Z. Naturforsch. 55a, 225—229 (2000); received October 13 1999 | | |
Published
| 2000 | | |
Keywords
| NQR, DSC, Crystal Structure, Phase Transition | | |
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| default:Reihe_A/55/ZNA-2000-55a-0225.pdf | | | Identifier
| ZNA-2000-55a-0225 | | | Volume
| 55 | |
267 | Author
| Hideta Ishihara, Keizo Horiuchi, V. G. Krishnan, Ingrid Svoboda, Hartmut Fuess | Requires cookie* | | Title
| Isolated versus Condensed Anion Structure VI: X-ray Structure Analysis and 81 Br NQR of Guanidinium Pentabromodicadmate(II), [C(NH 2 ) 3 ]Cd 2 Br 5 , fns-Hydrazinium Pentabromocadmate(II), [H 2 NNH 3 ] 3 CdBr 5 , and fo's-Hydrazinium Tetrabromocadmate(II)-Tetra Hydrate, [H 2 NNH 3 ] 2 CdBr 4 -4H 2 0  | | | Abstract
| The structure of the condensed bromocadmate anions in [C(NH 2) 3 ]Cd 2 Br 5 (1) and [H 2 NNH 3 ] 3 CdBr 5 (2) were studied at room temperature by X-ray diffraction. (1) crystallizes with double-chains bridged by Br atoms (orthorhombic, Pmmn, Z= 2, a = 1394.0(5), b = 394.5(1), c = 1086.9(5) pm). This chain structure was not described previously. (1) shows three 8 'Br NQR lines at temperatures between 77 and 323 K. Structural phase transitions take place at 283 K and at 535 K. (2) crystallizes with Br bridged zigzag-chains (monoclinic, P2[, Z=2,a = 943.1(1), b = 778.8(2), c = 942.0(2) pm, ß = 102.10(2)°) and shows a first-order phase transition around 304 K with a large thermal hysteresis. Below the transition point five 81 Br NQR lines are observed at temperatures between 122 and 304 K, and above the transition point four 81 Br NQR lines at tem-peratures between 288 and 353 K. Two 81 Br NQR lines are observed in [H 2 NNH 3 ] 2 CdBr 4 -4H 2 0 (3) at temperatures between 77 and around 320 K with positive temperature coefficients. | | |
Reference
| Z. Naturforsch. 55a, 390—396 (2000); received November 19 1999 | | |
Published
| 2000 | | |
Keywords
| NQR, DSC, Crystal Structure, Phase Transition, Bromocadmate | | |
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| default:Reihe_A/55/ZNA-2000-55a-0390.pdf | | | Identifier
| ZNA-2000-55a-0390 | | | Volume
| 55 | |
268 | Author
| Hiroyuki Ishida, Setsuo Kashino, Ryuichi Ikeda | Requires cookie* | | Title
| Crystal Structure of Trimethylammonium Tetrafluoroborate in Three Solid Phases  | | | Abstract
| The crystal structure of (CH 3) 3 NHBF 4 was studied in three solid phases by X-ray diffraction techniques. The structures of the ionic plastic phase (Phase I) stable above 453 K and Phase II between 384 and 453 K are CsCl-type cubic (a = 5.772(4) Ä) and tetragonal (a = 9.815(5) and c = 6.895(5) A), respectively. The room temperature phase (Phase III) forms a monoclinic lattice (space group P2,/m, a = 5.7017(8), b = 8.5724(9), c = 7.444(1) Ä, and ß = 102.76(1)°). BF 4 ~ ions in this phase were shown to be disordered in four orientations. | | |
Reference
| Z. Naturforsch. 55a, 765—768 (2000); received June 28 2000 | | |
Published
| 2000 | | |
Keywords
| Crystal Structure, X-ray Diffraction, Ionic Plastic Phase, Disorder | | |
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| default:Reihe_A/55/ZNA-2000-55a-0765.pdf | | | Identifier
| ZNA-2000-55a-0765 | | | Volume
| 55 | |
269 | Author
| Hideta Ishihara, Toshiya Okajima, Keizo Horiuchia, Ingrid Svobodab, Hartmut Fuessb | Requires cookie* | | Title
| Isolated versus Condensed Anion Structure VII: X-ray Structure Analysis of 1,3-Propanediammonium Dibromodichlorocadmate(II), [H3N(CH2)3NH3]CdBr2Cl2, and Estimation of Stability of Five-coordinated Halide Anions, MXg3-(M = Cd, Zn; X = Cl, Br) by Means of Ab-initio MO Calculations  | | | Abstract
| The coordination capability of Cl and Br in halogenocadmate(II) complexes is estimated by a solution of the structure of 1,3-propanediammonium dibromodichlorocadmate(II). The compound crystallizes as a layered anion structure with Cl bridges and Br terminals at 293 K: Imma, a = 741.56(7), b = 1869.5(5), and c -771.55(8) pm, Z = 4. In order to explain the stronger tendency of halogenocadmate(II) complexes to form layered structures as compared to halogenozincate(II), ab-initio calculations were performed. The stability of MX53-(M = Cd, Zn; X = Cl, Br) is compared. Isolated ZnX53-and CdBr53-ions are not stable. On the other hand a trigonal bipyramid CdCl53-ion is considered to be subtly stable in the crystal mainly due to Coulomb attractive interactions between the positively charged metal cation Cd2+ in a CdCl3 " fragment and two Cl-ions. | | |
Reference
| Z. Naturforsch. 56a, 641—646 (2001); received June 16 2001 | | |
Published
| 2001 | | |
Keywords
| Crystal Structure, Halogenocadmate(II), Ab-initio MO Calculations | | |
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| default:Reihe_A/56/ZNA-2001-56a-0641.pdf | | | Identifier
| ZNA-2001-56a-0641 | | | Volume
| 56 | |
270 | Author
| | Requires cookie* | | Title
| Zur Kenntnis der Erdalkaliantimonide und -wismutide Sr2Bi, Ba2Sb, Sr5Bi3, Ba5Sb3 und Ba5Bi3  | | | Abstract
| On the Earth-Alkali-A ntim onides and Bismutides Sr2Bi, B a2Sb, Sr5Bi3, B a5Sb3 and B a5Bi3 B r i g i t t e E i s e n m a n n und K l a u s D e l l e r The new compounds Sr2Bi, B a2Sb, Sr5B i3, B a5Sb3 and Ba5B i3 were prepared and their structures determined. The A 2B-compounds crystallize tetragonal bodycentered and are isotypic to Ca2Sb, Ca2Bi and Sr2Sb. The A5B 3-compounds build up the Mn5Si3-structure type. In both structures the element (V) atoms are coordinated only to earth alkali atoms. | | |
Reference
| (Z. Naturforsch. 30b, 66—72 [1975]; eingegangen am 23. September 1974) | | |
Published
| 1975 | | |
Keywords
| Earth Alkali Antimonides, Earth Alkali Bismutides, Crystal Structure | | |
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| default:Reihe_B/30/ZNB-1975-30b-0066.pdf | | | Identifier
| ZNB-1975-30b-0066 | | | Volume
| 30 | |
271 | Author
| W. Haase, R. Mergehenn, W. Krell | Requires cookie* | | Title
| Die Kristallstruktur von Thiocyanato(2-dimethylaminoäthanolato)kupfer(II) The Crystal Structure of Thiocyanato(2-dimethylaminoethanalato)copper(II)  | | | Abstract
| The crystal structure of the title compound has been determined from three-dimensional X-ray diffractometer data. Crystals are monoclinic, space group P2i/c with 8 CU(C4HIONO)SCN units in a cell of dimensions a = 11.951(4), b = 8.954(3), c = 16.805(6) Ä, and ß = 107.5(1)°. The structure was refined by least squares techniques to a final discrepancy factor of 0.041 based on 2234 observed independent reflexions. The compound is polymeric with copper atoms alternately bridged by two oxygen atoms and two thiocyanato groups. The coordination geometry around each copper atom is distorted square pyramidal. The basal plane consists of the two bridging oxygen atoms (mean value Cu-O: 1.914(3) A), the amino nitrogen atom (mean value Cu—N: 2.035(3) A) and the nitrogen atom from the thiocyanato group (mean value Cu-N: 1.908(3) A) while the axial coordination site is occupied by a sulfur atom from a thiocyanato group (mean value Cu-S: 2.979(2) A) centrosymmetric to the first. The magnetic susceptibility of the compound shows a broad maximum at 200 K. | | |
Reference
| (Z. Naturforsch. 31b, 85—89 [1976]; eingegangen am 25. September 1975) | | |
Published
| 1976 | | |
Keywords
| Crystal Structure, Copper Compound, Thiocyanato Bridging, Spin Coupling | | |
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| default:Reihe_B/31/ZNB-1976-31b-0085.pdf | | | Identifier
| ZNB-1976-31b-0085 | | | Volume
| 31 | |
272 | Author
| Klaus-Jürgen Range, Richard Leeb | Requires cookie* | | Title
| Preparation and Crystal Structure of the High Pressure Phase Tm 2 S3-II  | | | Abstract
| Single crystals of the quenchable high pressure phase Trri2S3-II were grown from a TmJ3-flux at 10 kbar, 1600 °C. The crystals are monoclinic, space group P2i/m, with a = 11.110(5) A, 6 = 3.874(3) A, c = 10.872(5) A, ß = 108.88(2) ° and Z = 4. In Tm2S3-II, which is isotypic with Er3ScS6, the four independent thulium atoms are coordinated by six (2 x), seven and eight sulfur atoms. | | |
Reference
| (Z. Naturforsch. 31b, 311—314 [1976]; eingegangen am 7. November 1975) | | |
Published
| 1976 | | |
Keywords
| Thulium Sesquisulfide, High Pressure Phase, Crystal Structure | | |
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| default:Reihe_B/31/ZNB-1976-31b-0311.pdf | | | Identifier
| ZNB-1976-31b-0311 | | | Volume
| 31 | |
273 | Author
| Bernd Grande, Hanskarl Müller-Buschbaum | Requires cookie* | | Title
| Über Oxocuprate, XIV Zur Kristallchemie von Sr2Cu304Cl2 On Oxocuprate, XIV On the Crystal Chemistry of Sr2Cu304Cl2  | | | Abstract
| The new compound Sr2Cu304Cl2 was prepared in melts of SrCl2. A single crystal X-ray examination (a = 546.2, c= 1259.1 pm, space group D^-14/mmm) shows that the octahedral distortion of the [Cu304Cl2] 4 ~-network cannot be explained only by the JAHN-TELLER effect. | | |
Reference
| (Z. Naturforsch. 31b, 405—407 [1976]; eingegangen am 24. November 1975) | | |
Published
| 1976 | | |
Keywords
| Strontium, Copper, Oxide Chloride, Crystal Structure, Coordination | | |
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| default:Reihe_B/31/ZNB-1976-31b-0405.pdf | | | Identifier
| ZNB-1976-31b-0405 | | | Volume
| 31 | |
274 | Author
| K. Diehl, D. Khodadadeh, J. Kummer, Strähle | Requires cookie* | | Title
| L  | | | Abstract
| Upon use of a synthetic method reported earlier by us respective alloys of Na/Sn, Na/Ge and Na/Sb are dissolved in ethylene-diamine and the title compounds precipitated from the solutions in high yield. By recrystal-lisation well shaped, stable crystals are obtain-ed. The crystal structure of [Na4 • 7 en]Sn9 confirms the presence of a Sn9 4 ~-polyhedron which had been suggested by us on the basis of other investigations. The Sn9 4_ -polyhedron may be described as a distorted tricapped trigonal prism. Ethylenediamine is coordi-nated to Na+-ions exclusively. | | |
Reference
| (Z. Naturforsch. 31b, 522—524 [1976]; eingegangen am 16. Februar 1976) | | |
Published
| 1976 | | |
Keywords
| Polyanionic Compounds, Germanium, Tin, Antimony, Crystal Structure | | |
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| default:Reihe_B/31/ZNB-1976-31b-0522_n.pdf | | | Identifier
| ZNB-1976-31b-0522_n | | | Volume
| 31 | |
278 | Author
| Brigitte Eisenmann, Gerhard Savelsberg, Herbert Schäfer | Requires cookie* | | Title
| Zur Darstellung und Kristallstruktur von Na2CuAs, K2CuAs und K2CuSb Preparation and Crystal Structure of Na2CuAs, K2CuAs and K2CuSb  | | | Abstract
| The three new compounds crystallize orthorhombic, space group Cmcm with Na2CuAs: a = 8.86(2) A, b = 7.22(2) A, c = 5.34(2) A; K2CuAs: a = 10.02(2) A, b = 7.56(2) A, c = 5.89(2) A; KsCuSb: a = 10.50(2) A, b = 7.93(2) A, c = 6.23(2) A. There are Cu-E(V)-Cu-E(V)-zigzag-chains in the structure, in which the Cu-atoms are linearly bonded to the E(V)-atoms. | | |
Reference
| (Z. Naturforsch. 31b, 1344—1346 [1976]; eingegangen am 15. Juli 1976) | | |
Published
| 1976 | | |
Keywords
| Intermetallic Compounds, Crystal Structure, Ternary Arsenides, Ternary Antimonides | | |
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| default:Reihe_B/31/ZNB-1976-31b-1344.pdf | | | Identifier
| ZNB-1976-31b-1344 | | | Volume
| 31 | |
279 | Author
| Helmut Rieskamp, Rainer Mattes | Requires cookie* | | Title
| Fluorreiche Oxofluorovanadate(V): Die Kristallstruktur von [enH2] [VOF5]  | | | Abstract
| The crystal structure of triclinic [enH2][VOF5], prepared in aqueous solution, has been determined from X-ray diffractometer data (i? = 0.076 for 527 reflections). The structure contains monomeric [VOFs] 2--ions. The bond distances are 1.54(1) Ä (terminal oxygen), 1.80(1) (average for the cis-fluorine atoms) and 2.10(1) Ä for the fluorine atom in trans-position to the terminal oxygen atom. This fluorine atom is involved in strong hydrogen bonds originating from the [NHaCH^CH^NEy 2 " 1 -cation with cisoid conformation. Earlier results about the existence of K2VOF5 could not be confirmed. | | |
Reference
| (Z. Naturforsch. 31b, 1453—1455 [1976]; eingegangen am 2. August 1976) | | |
Published
| 1976 | | |
Keywords
| Oxopentafluorovanadates(V), Crystal Structure, Vibrational Spectra | | |
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| default:Reihe_B/31/ZNB-1976-31b-1453.pdf | | | Identifier
| ZNB-1976-31b-1453 | | | Volume
| 31 | |
280 | Author
| Gerhard Cordier, Herbert Schäfer | Requires cookie* | | Title
| Neue intermetallische Verbindungen im arcJi-Ce202S-Strukturtyp New Intermetallic Compounds in the awfa"-Ce202S-Structure Type  | | | Abstract
| The new intermetallic compounds CaMn2Sb2, SrMn2Sb2 and CaMn2Bi2 have been prepared and structurally characterized. They are isotypic and crystallize trigonal in the an^-Ce202S-structure with the lattice constants: CaMn2Sb2: a = 4.54(1), c = 7.48(1), c/a = 1.65. SrMn2Sb2: a = 4.56(1), c = 7.70(1), c/a = 1.69. CaMn2Bi2: a = 4.63(1), c = 7.64(1), c/a = 1.65. | | |
Reference
| (Z. Naturforsch. 31b, 1459—1461 [1976]; eingegangen am 13. August 1976) | | |
Published
| 1976 | | |
Keywords
| Intermetallic Compounds, Crystal Structure, Ternary Antimonides, Ternary Bismutides | | |
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| default:Reihe_B/31/ZNB-1976-31b-1459.pdf | | | Identifier
| ZNB-1976-31b-1459 | | | Volume
| 31 | |
|