Equilibrium and Kinetic Studies of the Stannate(Iv)-Polyol Reaction
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Date
2010
Journal Title
Journal ISSN
Volume Title
Publisher
Chemical Society of Ethiopia
Abstract
The stability constants of 1:1 stannate(IV)-polyol complexes in aqueous media have been
determined using a conductimetric technique. The constants are fairly large, and lie in the range 5.3-123.0 for the
ten ligands investigated. These values were subsequently used in conjunction with kinetic data to postulate a
mechanism involving the species Sn(OH)5 as intermediate in the formation of the chelates. The stannate(IV)-
polyol reaction, though taking place at higher pH values, is acid-catalysed and follows first-order kinetics in the
oxyanion, but at large ligand-oxyanion mole ratios the reaction exhibits zero-order rate dependence on the polyol.
These features taken together are consistent with a unimolecular nucleophilic substitution on the oxyanion.
Description
Keywords
Hexahydroxystannate(IV), Polyol, Stability constants, Conductimetric method, Mechanism
Citation
Mbabazi, J., Wasswa, J., & Ntale, M. (2010). Equilibrium and kinetic studies of the stannate (IV)-polyol reaction. Bulletin of the Chemical Society of Ethiopia, 24(3).