Oxidation of ferrocene and 1,1'-ferrocene triselenide by bromine and phenyltellurium tribromide

The reaction of 1,1'-ferrocene triselenide, Fe(C5H4)(2)Se-3 (I), with bromine or phenyltellurium tribromide, PhTeBr3, involves the oxidation of compound I to form salts [Fe(C5H4)(2)Se-3]+FeBr (4) (-) (II) and [Fe(C5H4)(2)Se-3]+PhTeBr (4) (-) (III), respectively. Depending on the crystallization conditions, the reaction of ferrocene with PhTeBr3 affords salt [Fc](+)[PhTeBr4](-) (IVa), its solvate with benzene{[Fc](+)[PhTeBr4](-)}(2) center dot C6H6 (IVb), or etherate [Fc](+)[Ph2Te2Br6OH](-) center dot 0.5(C2H5)(2)O (V). The structures of compounds II, III, IVa, IVb, and V are determined by X-ray diffraction analysis (CIF files CCDC 1054193 (II), 1054192 (III), 1054194 (IVa), 1054195 (IVb), and 1054196 (V)).