Di-mu-pivalamidato-kappa4N:O;O:N-bis[(2,2'-bipyridine-kappa2N,N')(sulfato-kappaO)platinum(III)] tetrahydrate in a head-to-tail isomerism.

The title compound, [Pt(2)(III)(C(5)H(10)NO)(2)(SO(4))(2)(C(10)H(8)N(2))(2)].4H(2)O, is the first reported example of a complex in which an amidate-bridged Pt(bpy) dimer is stabilized in the oxidation level of Pt(III) (bpy is 2,2'-bipyridine). The asymmetric unit consists of one half of the formula unit with a twofold axis passing through the center of the dimer.