Collect. Czech. Chem. Commun. 1985, 50, 2431-2437

A polymer analog of DMSO: Interactions of alkali metals picrates with polymers containing bound sulfoxide groups

Václav Janout, Hana Hrudková and Pavel Čefelín

Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6


The equilibria of interactions of alkali metals (Li(+), Na(+), K(+)) picrates with a polymer analog of dimethyl sulfoxide derived from crosslinked polystyrene were investigated in an aqueous medium in order to obtain quantitative information on the complex-binding properties of sulfoxide groups covalently bound to the polymer. By using the spectrophotometric analysis, the binding constants and stoichiometry of the complex-forming process were determined as a function of the cation size, the degree of crosslinking of polystyrene, and the degree of its functionalization with sulfoxide groups. The values of the binding constants of alkali picrates reflect the structurally different character of the polymer the more the larger the alkali metal cation. The stoichiometric ligand-cation ratio lies in the range between 6 and 9.