Synthesis and Characterization of Selenium and Tellurium Oxychlorosulphates - Oxo Bis(Chlorosulphato)selenium(IV) Tellurium(IV); MO(SO3Cl)2 [M = Te or Se]

Sodium selenite, Na 2 SeO 3 and sodium tellurite, Na 2 TeO 3 dissolved in chlorosulphuric acid yielding highly conducting yellow colored solutions. Conductometric and spectrophotometric studies on these solutions reveal that these yellow colored solutions contain the solvolysed species, MO(SO 3 Cl) 2 [M = Se or Te]. Concentrated solutions of sodium selenite and sodium tellurite afforded the isolation of solid of selenium and tellurium oxychlorosulphates. These oxychlorosulphates are hygroscopic and non-polymeric.