Unusually short distances between the carbonyl oxygen and the tin atom in RCOSMR'3 (M = Ge, Sn, Pb): the importance of intramolecular n(O) --> sigma*(MS) orbital interactions.
[structure: see text]. We found that the C=O.Sn distance in RCOSSnR'3 was shorter than the C=O.Ge distance in RCOSGeR'3 and theoretically confirmed that the orbital interactions between the nonbonding orbitals on the carbonyl oxygen (n(O)) and the sigma*(SnS) orbitals were important in regard to the shortness.
Department of Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.
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