Preparation of salts of some iodoselenium(IV) cations

Abstract

Bis(perfluoroethyl) diselenide reacts quantitatively with [I₂][Sb₂F₁₁] and [I₃][AsF₆] to give corresponding salts of the [Se(C₂F₅)I₂]⁺ cation. Bis(perfluoroethyl) monoselenide reacts with [I₂][Sb₂F₁₁], in the presence of excess of SbF₅, probably yielding [Se(C₂F₅)₂I][Sb₂F₁₁]. The reaction of AsF₅ with elemental iodine and selenium in a 3 : 1 atomic ratio yields [SeI₃][AsF₆]. Preliminary single-crystal X-ray diffraction results show [SeI₃][AsF₆] to be monoclinic, space group P2₁/c, a= 8.24(2), b= 10.24(2), c= 12.35(2)Å, β= 99.3(3)°, U= 1 028.4 ų, and Z= 4.