Crystal and molecular structure of the complex neptunium(V) acetate [(NpO2)2(CH3COO)2H2O]·C2H3N

The synthesis and crystal structure (CAD4 autodiffractometer, λMoKαradiation) of [(NpO2)2Ac2H2O]·C2H3N are described. Crystal data: (1) = 25.311(9), (2) = 6.782(2), (3) = 8.065(3) Angstrom, V = 1384.4(8) A3, space group Pnma, Z = 4, R = 0.046, Rw = 0.046 for 1505 independent reflections. The structure is based on neutral layers parallel to the (100) plane with the composition [Np(1)O2Np(2)O2Ac(1)Ac(2)H2O]n·. Acetonitrile molecules are located in the interlayer space. The coordination polyhedron of the Np(l) atom is pentagonal bipyramid (coordination number 7), and that of the NP(2) atom is a derivative of pentagonal bipyramid (coordination number 8) incorporating coordinated water molecule. In a layer, bidentate dioxo cations Np(1)O2+ and Np(2)O2+ are associated by cation-cation bonds into neptunium-oxygen network, in which rhombic prisms of 8 Np atoms may be distinguished. Geometric characteristics, features of the structure and properties of the compound are discussed