Homoleptic uranium(III) imidodiphosphinochalcogenides including the first structurally characterised molecular trivalent actinide-Se bond

Preparation of U[N(EPPh2)(2)](3) (E = S or Se) by treating U[N(SiMe3)(2)](3) with three equivalents of NH( EPPh2)(2) is described together with presentation of a hitherto unreported molecular crystal structure containing An(III)-Se bonds (An = actinide).