Variable-temperature tin-119 119m mössbauer study of the chlorodimethyltin(IV) derivatives of L-cysteine and DL-penicillamine

Abstract

Abstract : The question of intermolecular association in the chlorodimethyltin (IV) derivatives of L-cysteine (a monohydrate) and DL-penicillamine is settled by variable-temperature tin-119m Mossbauer data between 77 and 140 or 150k, respectively. The slopes of the natural logs of the areas under the resonance are -1.58 + or - 0.1/100/K and -1.46 + or - 0.1/100/K, respectively, considerably lower than those for monomeric lattices. These data rule out an extended association through bridging amino nitrogen atoms or carboxyate oxygen atoms, and suggest a lattice in which small molecular or oligomeric units are associated by an extensive network of hydrogen bonds. An alternative ionic structure of Cl(CH3)2SnSCR2CH(NH3(+))C00- units where R = H can be ruled out on the basis of infrared data (nu(OH)=3450/cm).