South African Journal of Chemistry
On-line version ISSN 1996-840X
Print version ISSN 0379-4350
SHOUKRY, M.M.; AL-ALOUSI, Ayser and TAREK, Sameya M.. Diorganotin(IV) Complexes with Methionine Methyl Ester. Equilibria and Displacement by DNA Constituents. S.Afr.j.chem. (Online) [online]. 2014, vol.67. ISSN 1996-840X.
The coordination of methionine methyl ester with dimethyltin(IV) (DMT), dibutyltin(IV) (DBT) and diphenyltin(IV) (DPT) was investigated at 25 °C and 0.1 mol dm-3 ionic strength in water for dimethyltin(IV) and in 50 % dioxane-water mixture for dibutyltin(IV) and diphenyltin(IV). Methionine methyl ester forms 1:1 and 1:2 complexes with diorganotin(IV). The corresponding formation constants were calculated by using the non-linear least-squares program MINIQUAD-75. The concentration distribution of the various complex species was evaluated as a function of pH. The displacement of coordinated methionine methyl ester with some DNA constituents was calculated based on equilibrium aspects.
Keywords : Dimethyltin(IV); dibutyltin(IV); diphenyltin(IV); methionine methyl ester; stability constant.