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A 119 Sn Mössbauer spectroscopic study on complexes of di‐and tri‐organotin(IV) moieties with 2‐mercaptoethanesulfonates, in the solid state and in 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.590020508
Subject(s) - chemistry , aqueous solution , mössbauer spectroscopy , tin , inorganic chemistry , quadrupole splitting , titration , crystallography , organic chemistry
The configuration of the bonding environment of tin in the complexes [R 2 Sn(SCH 2 CH 2 SO 3 ) 2 ] 2− (R = Me, Ph) and [Me 3 Sn(SCH 2 CH 2 SO 3 )] − has been determined to be tetrahedral both in the solid state and in aqueous solution (for the methyl derivatives). The coordination number of tin increases to five in aqueous solutions for the Me 2 Sn(IV) complexes in Hepes buffer (N‐2‐hydroxyethylpiperazine‐N′‐2‐ethanesulfonic acid; at least in fivefold excess, at pH 7.4) due to coordination by the tertiary amino nitrogen atom. No effect is detected due to the surfactant 2‐hydroxypropylcellulose concerning both coordination to tin and influence on the Mössbauer parameters. The stoichiometry of mixed complex formation in aqueous solution of Me 2 Sn(IV), 2‐mercaptoethanesulfonate and Hepes is 1:2:1, according to a procedure of ‘Mössbauer titration’. All complexes in aqueous solution undergo slow lysis of the tin‐sulfur bonds. Structural assignments have been generally effected on the basis of the magnitude of experimental values of Mössbauer nuclear quadrupole splittings, measured at 77 K for both solid and frozen aqueous absorbers, and comparison with data calculated by the point‐charge model approach.