Np(V) dicyanamide complexes with electroneutral N-donor ligands

Three new complexes of Np(V) dicyanamide with electroneutral N-donor ligands have been synthesized and structurally characterized: two with terpyridine derivatives: [(NpO2)(Cl-Terpy)(DMA)(N(CN)(2))]center dot 0.5DMA (1), [(NpO2)(TPTZ)(N(CN)(2))(H2O)]center dot 2H(2)O center dot CH3OH (2) and a dimeric complex with bipyridine [(NpO2)(Bipy)(N(CN)(2))(H2O)](2)center dot 2(CH3OH) (3). In compounds 1-3, the coordination polyhedra of Np atoms are pentagonal bipyramids with "yl" oxygen atoms in apical positions. The equatorial plane of the bipyramids is formed by nitrogen atoms of the anions [N(CN)(2)](-) and N-donor electroneutral ligands (Cl-Terpy, TPTZ, Bipy) and the oxygen atom of water molecule (1, 3) or DMA (2). In compounds 1 and 2, the [N(CN)(2)](-) anions manifest themselves as monodentate ligands, and in compound 3 dicyanamide is a bidentate-bridging ligand.