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  • Chemistry  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthesen, Strukturen und thermische Abbaureaktionen von TlI-, PbII- und SeII-Komplexen mit 2,2-Dicyanethylen-1,1-diselenolat (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1565-1570 
    Details
    ISSN: 0009-2940
    Keywords: Diselenolates ; Thallium complexes ; Lead complexes ; Selenium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation, Structures, and Thermal Decomposition Reactions of Complexes Consisting of TlI, PbII, and SeII and 2,2-Dicyanoethylene-1,1-diselenolateThe 2,2-dicyanoethylene-1,1-diselenolate-containing compounds (AsPh4)2[Tl2(Se2C=C(CN)2)2], (AsPh4)2[Pb(Se2C=C-(CN)2)2], and (NBu4)2[Se(Se2C=C(CN)2)2] have been prepared and characterized by single-crystal structure analysis. The molecular structures of the complex anions 1-3 are significantly influenced by the presence of stereochemically active lone pairs. 1 is dimeric with an Se4Tl2 octahedral centre with a Tl-Tl distance of 3.547(4) Å and an average Tl-Se bond length of 3.143(4) Å. In 2 Pb constitutes the centre of a distorted pseudo-trigonal bipyramid PbSe4E [Pb-Seave = 2.948(3) Å] with one equatorial position obviously occupied by the lonepair E. In 3 the ligands are coordinated to the central Se, which is situated in a centre of symmetry, in an undistorted way giving rise to a Ψ-octahedral SeSe4E2 geometry [Se-Seave = 2.617(2) Å]. The compounds (AsPh4)2 · 1, (AsPh4)2 · 2 and (NBu4)2 · 3 have been decomposed thermally to yield TlSe, PbSe as well as Se. The observed contamination of TlSe and PbSe with As is avoided by using (NBu4)2 · 1 and (NBu4)2 · 2 as precursor materials.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250709
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  • 2
    Electronic Resource
    Electronic Resource
    Neue dimere Goldselenolate: Darstellung und strukturelle Charakterisierung von [(n-C4H9)4N]2[AuSSeC=C(CN)2]2 und [(n-C4H9)4N]2[AuSe2C=C(CN)2]2Herrn Professor Wolfgang Beck zum 60. Geburtstage gewidmet (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 611 (1992), S. 81-84 
    Details
    ISSN: 0044-2313
    Keywords: Gold complexes ; preparation ; crystal structures ; ab initio Hartree-Fock calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Dimeric Gold Selenolates: Preparation and Characterization of [(n-C4H9)4N]2[AuSSeC = C(CN)2]2 and [(n-C4H9)4N]2[AuSe2C = C(CN)2]2The preparation and structural characterization of the dimeric AuI complexes of 1,1-dicyanoethene-2,2-thioseleonlate (i-mnts) and 1,1-dicyanoethene-2,2-diselenolate (i-mns), isolated as Bu4N salts, are described. They are isotype (monoclinic, space group P21/c, Z = 2) with lattice parameters: (Bu4N)2[Au(i-mnts)]2; a = 14.078(3) Å, b = 8.912(3) Å, c = 20.142(4) Å, β = 106.32(5)°; (Bu4N)2[Au(i-mns)]2; a = 13.998(3) Å, b = 9.125(3) Å, c = 20.039(2) Å, β = 105.12(5)°. Ab initio Hartree-Fock calculations based on the experimentally determined structure yield a positive value of the Au—Au bonding order suggesting weak bonding interactions between the d10 metal centres.
    Notes: Die Darstellung und Strukturaufklärung der als Bu4N-Salze (Bu = n-C4H9) isolierten dimeren AuI-Komplexe des 1,1-Dicyanoethen-2,2-thioselenolats (i-mnts) und des 1,1-Dicyanoethen-2,2-diselenolats (i-mns) werden beschrieben. Sie kristallisieren zueinander isotyp (monoklin, Raumgruppe P21/c, Z = 2) mit folgenden Gitterkonstanten: (Bu4N)2[Au(i-mnts)]2; a = 14,078(3) Å, b = 8,912(3) Å, c = 20,142(4) Å β = 106,32(5)°; (Bu4N)2[Au(i-mns)]2; a = 13,998(3) Å, b = 9,125(3) Å, c = 20,039(2) Å, β = 105,12(5)°. Ab-initio-Hartree-Fock-Rechnungen unter Zugrundelegung der experimentell bestimmten Geometrie mit Kristallfeldsimulation liefern einen positiven Wert der Au—Au-Bindungsordnung, der darauf hindeutet, daß der kurze Au—Au-Abstand (2,810(1) äR) auf schwache bindende Wechselwirkungen zwischen den d10-Metallzentren zurückgeführt werden kann.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926110513
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