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1Author    Joachim Strähle, Jürgen Gelinek, Marianne Kölmel, Anna-Maria NemecekRequires cookie*
 Title    Die Kristallstruktur der Salze K2Au2I6 und Cs2Ag_rAu I 1_aAu 1,I Br6. Ein Beitrag zur Kristallchemie der Alkalihexahalogenoaurate(I,III) Crystal Structure of the Salts K2AU2IÖ and Cs2Aga;Au I I_a;Au III Br6. A Contribution to the Crystal Chemistry of the Alkali Hexahalogeno Aurates(I,III)  
 Abstract    K2Au2l6 crystallizes in the monoclinic space group P 2i/n. It is built up by linear anions AUI2 _ , square-planar anions AUU -, and K+ cations. The coordination of the gold(I) and gold(III) atoms is completed by additional iodine atoms at larger distances to form compressed and elongated octahedra, respectively. Like the other known alkali hexa-halogeno aurates(I,III), K2AU2IÖ belongs to a family of topologically related structures in which the perovskite is the aristotype. The actual structures depend on the size of the alkali metals: more dense structures with smaller coordination numbers for the smaller alkali metals result from a rotation of the coordination octahedra of the gold atoms. Cs2AgAuBr6 does not crystallize in the ideal cubic perovskite structure, as was de-scribed in 1942, but a disordered cubic phase (a = 550.1 pm, space group Pm3m), with the composition Cs2Aga.Auii_aAuniBr6 (x ^0.25), can be prepared from HBr solution. Its cubic symmetry is the result of a statistical superposition of the coordination polyhedra of Agi, Aui and Auni. 
  Reference    Z. Naturforsch. 34b, 1047—1052 (1979); eingegangen am 3. Mai 1979 
  Published    1979 
  Keywords    Crystal Structure, Alkali Metal Hexahalogeno Aurates(I, III), Crystal Chemistry 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1047.pdf 
 Identifier    ZNB-1979-34b-1047 
 Volume    34 
2Author    P. Gütlich, B. Lehnis, K. Römhild, J. SträhleRequires cookie*
 Title    Gemischtvalente Bromoaurate(I,III) und ihre Mößbauer-Spektren Mixed Valent Bromo Aurates(I.III) and their Mößbauer Spectra  
 Abstract    New nonstoichiometric cesium bromo aurates(I,III) Csi+a;(AuBr4)(AuBr2, Br3,Br)z have been synthesized, in which the almost equally shaped anions AuBro -and Br3~ can inter-change themselves. The compounds crystallize in a disordered cubic perovskite structure with a = 547.5 pm or in a tetragonal superstructure with a 16-fold perovskite cell (a = 1553, c = 1099 pm). The investigations show that other bromoaurates as the previously reported "Cs2AgAuBr6" can contain perceptible amounts of Br3 _ ions also. The IR and 197 Au Mössbauer spectra of the new bromoaurates and of Cs2AuoBr6 are discussed. 
  Reference    Z. Naturforsch. 37b, 550—556 (1982); eingegangen am 12. Januar 1981 
  Published    1982 
  Keywords    Mixed Valent Bromo Aurates(I, III), Synthesis, Structure, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0550.pdf 
 Identifier    ZNB-1982-37b-0550 
 Volume    37 
3Author    Z. NaturforschRequires cookie*
 Title    Die Kristallstrukturen von N a2CoFeF7 und einer zweiten Modifikation von Na2CuFeF7: Eine weitere Weberit-Variante  
 Abstract    The Crystal Structures o f N a2C o F e F 7 an d a Second M odification o f N a 2C u F e F 7: A n o th e r W eberite V arian t M atth ias W elsch u n d D ietrich Babel* The monoclinic weberites N a2C oF eF 7 (a = 1262.2(10), b = 736.0(4), c = 2451.6(20) pm, ß = 99.71(5)°) and a second modification o f N a 2C uFeF 7 (a = 1244.4(2), b = 734.3(1), c = 2467.2(5) pm, ß = 99.27(3)°), crystallize isotypically in space group C 2 /c, Z = 16. The structure is an intermediate type between orthorhombic and trigonal weberites, characterized by pairs ofpar-allel chains o f octahedra [MF4F2/2]3' (M = Co, Cu) which run in turn along [110] and [110]. The average distances are F e -F = 192 pm in the [FeF6]3~ octahedra o f both compounds. C on­ siderable splitting o f distances occurs in the [CoF6]4-octahedra (av. C o -F = 201 pm), and by Jahn-Teller distortion even more in those o f [CuFJ4-(av. C u -F = 199 pm). One o f the copper surroundings is (pseudo)tetragonally elongated (av sual splitting into three long and three short bonds Some structural relations are discussed. 
  Reference    Z. Naturforsch. 47b, 685—6 (1992); eingegangen am 1. Oktober 1991 
  Published    1992 
  Keywords    Crystal Structure, Weberite, Heptafluorodimetallates(II, III), Jahn-Teller Distortion 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0685.pdf 
 Identifier    ZNB-1992-47b-0685 
 Volume    47 
4Author    Fritz Preuss, M. Artina, Steidel, Reiner ExnerRequires cookie*
 Title    Tris(te/*f-butoxo)silylthiolato-Komplexe des Vanadiums(V, IV, III) Tris(/<?r?-butoxo)silylthiolato Complexes of Vanadium(V, IV, III)  
 Abstract    Tris(te/7-butoxo)silylthiolato Com plexes o f Vanadium(V. 
  Reference    Z. Naturforsch. 45b, 1618—1624 (1990); eingegangen am 17. Mai 1990 
  Published    1990 
  Keywords    IV, III), Preparation, N M R Spectra, ESR Spectra, X-Ray Structure Determination 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1618.pdf 
 Identifier    ZNB-1990-45b-1618 
 Volume    45 
5Author    W. Preetz, G. PetersRequires cookie*
 Title    Darstellung und Charakterisierung der Tetrabutylammoniumsalze von [TC2C18] 2 ", [TC2C18] 3 -und [Te2Br8] 2 - Preparation and Characterization of the Tetrabutylammonium Salts of [TcaClg] 2 -, [Tc2Cl8] 3 -and [Tc2Br8] 2  
 Abstract    The reduction of [TcCL] 2-with Zn in conc. HCl after evaporation and extraction of ZnCl2 by diethylether yields a red-brown product from which after dissolving in dilute HCl by a solution of (TBA)Cl in CH2C12 (TBA)2[Tc2Cl8] and (TBA)3[Tc2Cl8] can be extracted. The separation is achieved by the much better solubility of the green (TBA)2[Tc2Cl8] in acetone compared with that of the grey-blue (TBA)3[Tc2Cl8]. On treatment of (TBA)2[Tc2Cl8] dissolved in acetone with bromine-free conc. HBr carmine red (TBA)2[Tc2Br8] is obtained for the first time. The vibrational spectra are similar and can be assigned according to the assumed D4H-symmetry. In the Raman spectra of both octachloroditechnetates the intensive Tc-Tc-vibration (Aig) is observed at 307 cm -1 , for (TBA)2[Tc2Br8] it is found at 323 cm-1 . The electronic spectrum of (TBA)2[Tc2Cl8] agrees to a high extent with that of the corresponding Re compound. 
  Reference    Z. Naturforsch. 35b, 797—801 (1980); eingegangen am 17. März 1980 
  Published    1980 
  Keywords    Octachloroditechnetate(III), Octachloroditechnetate(II, III), Octabromoditechnetate(III), Raman Spectra, IR Spectra, UVS Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0797.pdf 
 Identifier    ZNB-1980-35b-0797 
 Volume    35