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119 Sn Mössbauer studies of bis[cysteinato(1 − )‐ S ]‐ and bis[penicillaminato(1 − )‐ S ]‐diorganotin(IV) species in the crystalline state and in frozen aqueous solution
Author(s) -
Barbieri Renato,
Silvestri Arturo,
Huber Friedo
Publication year - 1988
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590020605
Subject(s) - chemistry , mössbauer spectroscopy , tin , aqueous solution , glycylglycine , crystallography , trigonal bipyramidal molecular geometry , inorganic chemistry , quadrupole splitting , crystal structure , glycine , organic chemistry , amino acid , biochemistry
The bonding and the configuration of the tin environment in the title compounds {R 2 Sn[SCH 2 CH(NH 3 + )COO − ] 2 and R 2 Sn[SC(CH 3 ) 2 CH(NH 3 + )COO − ] 2 , indicated in the following as R 2 Sn(cysH) 2 and R 2 Sn(penH) 2 respectively} has been investigated through the determination of the Mössbauer‐Zeeman spectra of Ph 2 Sn(cysH) 2 and Ph 2 Sn(penH) 2 in the solid state, and through conventional Mössbauer spectroscopy of Me 2 Sn(penH) 2 in the solid state as well as of Me 2 Sn(cysH) 2 and Me 2 Sn(penH) 2 in aqueous solution (frozen). The treatment of the data by the pointcharge model approach suggested the general occurrence of a tetrahedral C 2 SnS 2 core. In aqueous Hepes buffer, a tertiary amino nitrogen atom has been observed to coordinate tin in Me 2 Sn(cysH) 2 and Me 2 Sn(penH) 2 , with formation of trigonal bipyramidal tin environments. The latter solutions undergo slow decomposition reactions at room temperature. From (Me 2 SnS) 3 occurs, as well as formation of soluble complex species in the presence of glycylglycine; Me 2 Sn(penH) 2 appears to undergo a slow desulfuration reaction.