D ‐Glucuronate complexes of mono‐, di‐ and triorgano tin(IV) compounds: potentiometric and Mössbauer spectroscopic investigations

Complex species formation of glucuronate with mono‐, di‐ and trimethyltin(IV) cations has been studied potentiometrically in a wide range of ionic strength (0.1 to 1 mol l −1 , NaCl medium), at 25 °C. By a suitable complex formation model, according to which all the interactions are considered, the formation constants at infinite dilution have been calculated by using a well‐tested equation for the ionic strength dependence. The following complex species have been found (R = CH 3 ): [RSn(gluc)(OH)] + , [RSn(gluc)(OH) 2 ] 0 and [(RSn) 2 (gluc)(OH) 5 ] 0 for the monomethyltin(IV)–glucuronate system; [R 2 Sn(gluc)] + and [R 2 Sn(gluc)(OH)] 0 for the dimethyltin(IV)–glucuronate system; and [R 3 Sn(gluc)] 0 for the trimethyltin(IV)–glucuronate system. Mössbauer investigations, carried out in quickly frozen solution, confirmed the species formation and led us to propose their structural configuration. Copyright © 2002 John Wiley & Sons, Ltd.