Modellrechnungen von Kraftkonstanten der Tetramethyl-Verbindungen (CH3)4−nM(CD3)n,M=Si, Ge, Sn, Pb

Fromthe experiemntal fundamental vibrational frequencies of (CH3)4M, (CD3)4M and (CH3)3MCD3,M=Si, Ge, Sn, Pb, and of (CH3)2Si(CD3)2 and CH3Si(CD3)3 a transferable local symmetry type force field for (CH3)4−nM groups has been calculated. Applications involving differentM atoms and numbersn of CH3 groups are presented.