REACTION OF N,N'-DIMETHYLIMIDAZOLIDINE-2-SELONE(L) WITH I-2 - CRYSTAL-STRUCTURE OF THE MIXED-VALENCE (L-CENTER-DOT-I-2)(L(2))(2-DOT-2I(3)(-) COMPOUND()CENTER)

From the reaction of N,N'-dimethylimidazolidine-2-selone (L) with I-2 the mixed-valence (L . I-2)(L(2))(2+). 2I(3)(-) compound has been prep ared. (L . I-2)(L(2))(2+). 2I(3)(-) consists of a neutral adduct betwe en L and a diiodine molecule and a triiodide salt, whose dication is f ormed by two L molecules joined through an Se-Se bond. This is the fir st example of a dication bearing the -Se-Se- bridge obtained by direct oxidation of a selenic compound with diiodine. FT-IR and FT-Raman spe ctra agree well with the structural features. Crystals of (L . I-2)(L( 2))(2+). 2I(3)(-) are triclinic, space group <P(1)over bar>, Z = 2, wi th unit cell dimensions a = 8.465(2), b = 10.233(3), c = 21.798(8) Ang strom, alpha = 95.81(3), beta = 90.53(2), gamma = 103.18(2)degrees, R = 0.027.