Abstract
The ability of dimeric bis(imido) uranium(V) complexes with the general formula [U(N(t)Bu)(2)(Y)((t)Bu(2)bpy)](2) (Y = I (1), SPh (2); (t)Bu(2)bpy = 4,4'-di-tert-butyl-2,2'-bipyridyl) to behave as two-electron reducing agents was examined with I(2), AgX (X = Cl, Br), PhEEPh (E = S, Se, Te), and chalcogen (O, S, Se) atom transfer reagents. The addition of I(2) and AgX to 1 leads to the formation of uranium(VI) dihalide complexes with the general formula U(N(t)Bu)(2)(I)(X)((t)Bu(2)bpy) (X = I (3), Cl (4), Br (5)). Complexes 1 and 2 can also reduce PhEEPh to generate uranium(VI) complexes with the general formula U(N(t)Bu)(2)(X)(EPh)((t)Bu(2)bpy) (X = I, E = S (6), Se (8), Te (10); X = SPh, E = S (7), Se (12)). These unsymmetrical complexes appear to be in equilibrium with the uranium(VI) complexes U(N(t)Bu)(2)(X)(2)((t)Bu(2)bpy) and U(N(t)Bu)(2)(EPh)(2)((t)Bu(2)bpy) (E = Se (9), Te (11)) and suggest that both U-I and U-E bonds possess a labile nature in bis(imido) uranium(VI) complexes. Complex 1 also reacts as a two-electron reductant toward chalcogen atom transfer reagents such as 4-methylmorpholine N-oxide, S(8), and Se to produce dimeric bis(imido) uranium(VI) complexes with the general formula [U(N(t)Bu)(2)(I)((t)Bu(2)bpy)](...Continue Reading
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