Polynuclear ternary chelates formed by chromium(III) and indium(III) or tin(II) in aqueous solutions of hydroxy-carboxylic acids

Abstract

Treatment of an aqueous solution of chromium(III)citrate, malate, or tartrate containing a large excess of hydroxycarboxylic acid at pH of about 3·0 with indium(III) or tin(II) results in the formation of chelate containing both chromium(III) and indium(III) or tin(II) in various ratios. The formation of these ternary chelates has been studied by spectrophotometry, anion exchange, and polarography. The stoicheiometry of the ternary chelates was established by polarographic techniques.