03 Fakultät Chemie

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/4

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Institute: search.filters.UBSInstitut.Max-Planck-Institut für FestkörperforschungAuthor: search.filters.author.Becker, Gerd

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Now showing 1 - 3 of 3
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    Monomeric and dimeric (aminomethylidene)phosphines and -arsines
    (1986) Becker, Gerd; Mayer, M.; Mundt, Otto; Riffel, Heinz; Wessely, Hans-Jürgen; Simon, Arndt
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    Intermolekulare Sb···Sb-Wechselwirkungen im kristallinen Tetramethyldistiban (Element-Element-Bindungen ; 3)
    (1984) Mundt, Otto; Riffel, Heinz; Becker, Gerd; Simon, Arndt
    Tetramethyldistibane which shows a colour change from deep red to pale yellow upon melting, has been subjected to single-crystal x-ray diffraction analyses at -21° and -139°C (orthorhombic, Pnma, Z = 4, -139°C: a = 1150.9(3); b = 1136.8(2); c = 651.6(2) pm). The molecules adopt the antiperiplanar conformation with the crystallographically imposed symmetry m (c 3) and are aligned in extended linear antimony chains with short intermolecular contacts (-139 °C: Sb-Sb 283.8(1), Sb···Sb 367.8(1) pm; Sb-Sb...Sb 179.2°). The structure is compared with those of similar compounds.
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    Molekül- und Kristallstruktur des Tetramethyldiphosphans und -diarsans (Element-Element-Bindungen ; 4)
    (1988) Mundt, Otto; Riffel, Heinz; Becker, Gerd; Simon, Arndt
    The molecular and crystal structures of the isotypic compounds tetramethyldiphosphane 1 and -diarsane 2 have been determined by single crystal X-ray diffraction (monoclinic; C2/m; Z = 2; 1/2: -155/-144 ·C°; a = 540.6(2)/555.8(2); b = 1131.0(6)/1136.7(6); c = 602.5(2)/612.8(2) pm;β = 97.31(3)/95.24(3)"; P-P 221.2(1)/As-As242.9(1) pm). In accordance with the crystallographically imposed symmetry 2/m, the molecules adopt antiperiplanar conformation. Their crystal structures are c10sely related to those of the homologues tetramethyldistibane 3 [1] and -dibismuthane 4 [3]. As found for the latter compounds, the E-E units (E = P, As) are also aligned in linear chains, but the intermolecular E···E contacts (P...P 381/As...As 370 pm) do not allow any extended interaction between molecules, which otherwise would result in thermochromic effects.