Mössbauer spectra of tin(IV) in anion exchange resins sorbed from hydrochloric and hydrobromic acid solutions

Abstract

Mössbauer spectra were observed for 119Sn(IV) in AG 1 anion exchange resin sorbed from hydrochloric and hydrobromic acid solutions of various concentrations. The isomer shift values observed in resins sorbed from 1 and 2 or 3 N HBr were, respectively, 0·54 and 0·67 mm/sec, which were different from the value of 0·87 mm/sec for SnBr 6 2−. Applying the isomer shift-electronegativity correlation for the octahedral complexes, these results were attributed to the hydroxo complexes, SnBr 4(OH) 2 2− and SnBr 5(OH) 2−, respectively. The isomer shift value of ∼ 0·43 mm/sec observed for Sn(IV) in resin sorbed from 1–9 N HCl was concluded to be SnCl 5(OH) 2−. From 12 N HCl, tin (IV) was sorbed as SnCl 6 2−. When the resins were dried, they converted to SnBr 6 2− or SnCl 6 2−. The spectra observed at 0·01 and 0·1 N HCl or HBr were complicated suggesting that tin(IV) was sorbed as higher hydroxo complexes.