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  • 1
    Electronic Resource
    Electronic Resource
    Ternäre Thalliumchalkogenide mit Tl4Ge2S6-Struktur (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 859-867 
    Details
    ISSN: 1434-4475
    Keywords: Crystal Structure ; Thallium chalcogenides ; Thallium(I) selenogermanate ; Thallium(I) selenosilicate ; Thallium(I) thiosilicate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The new ternary thallium chalcogenides Tl4Si2S6, Tl4Si2Se6, and Tl4Ge2Se6 were synthetized from the elements. The compounds crystallize in the triclinic system (space group P $$\bar 1$$ ) with the cell parametersa=6.699 (5),b=6.645 (4),c=8.380 (5) Å, α=90.32 (5), β=112.00 (5), γ=112.32 (5)° for Tl4Si2S6,a=6.875 (2),b=6.866 (2),c=8.731 (2) Å, α=90.50 (2), β=111.69 (2), γ=113.70 (2)° for Tl4Si2Se6,a=6.925 (6),b=6.934 (7),c=8.771 (6) Å, α=90.55 (7), β=111.42 (6), γ=114.45 (7) for Tl4Ge2Se6 andZ=1 for all cases. On the basis of single crystal X-ray intensity data the compounds were shown to be isostructural with Tl4Ge2S 6 1 . The crystal structures of Tl4Si2S6, Tl4Si2Se6, and Tl4Ge2Se6 are characterized by anions [Si2S6]4−, [Si2Se6]4−, and [Ge2Se6]4− which consist of two tetrahedral SiS4, SiSe4, and GeSe4 groups, respectively, with a common edge. A short comparative discussion of dinuclear tetrahedral thio- and selenoanions of main group elements is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00799226
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  • 2
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur der Tieftemperaturmodifikation von Ag8GeS6 (1977)
    Springer
    Monatshefte für Chemie 108 (1977), S. 901-913 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The low temperature form of Ag8GeS6 (synthetic argyrodite) is orthorhombic, space group Pna21, witha=15.149 (1),b=7.476 (2),c=10.589 (1), andZ=4. The crystal structure has been determined from 2-circle diffractometer data by means of direct methods and refined toR=0.081 for 3431 intensities. The structure consists of slightly distorted isolated GeS4 tetrahedra (mean Ge−S bond length 2.212 Å) and two further sulphur atoms without bonds to the germanium atoms. The GeS4 tetrahedra and the S atoms are connected by the Ag atoms to form a three-dimensional framework. Three types of Ag coordination by S atoms are encountered. Three Ag positions have a strongly distorted tetrahedral environment, four Ag positions an approximately planar threefold coordination, while one Ag atom is almost linearly coordinated by two S atoms. The Ag−S distances are 2.56–2.94 Å, 2.49–2.76 Å, and 2.42–2.44 Å, resp. All Ag atoms have at least one near Ag neighbour between 2.93 and 3.11 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00898056
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  • 3
    Electronic Resource
    Electronic Resource
    A Direct Route to Halogenated Arsaborane Clusters: Crystal Structure of 3,4,5,6-Tetrachloro-1,2-diarsa-closo-hexaborane(4)Dedicated to Professor Peter Paetzold on the occasion of his 60th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 735-736 
    Details
    ISSN: 0009-2940
    Keywords: 1,2-Diarsa-closo-hexaborane(4) ; Perchlorinated arsaborane clusters ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copyrolysis of B2Cl4 and AsCl3 at 330°C leads to the formation of closo-1,2-As2B4Cl4 (1) and further products the mass spectral evidence of which suggests that they are perchlorinated arsaboranes As2B5Cl5, As4B8Cl6, and As2B10Cl10. The pyrolysis temperature and the molar ratio of the reactants exert an essential influence on the type and distribution of the products. At temperatures above 400°C and higher B2Cl4/AsCl3 ratios the formation of As2B10Cl10 is preferred to that of smaller arsaboranes. A single-crystal X-ray study of 1 confirmed that, consistent with its 14-skeletal electron count, the arsaborane adopts a slightly distorted octahedral structure with the arsenic atoms in adjacent cis positions.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280713
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