Three-dimensional bimetallic oxides constructed from molybdophosphonate chains and secondary-metal/4-pyridyltetrazole components

The hydrothermal reactions of molybdenum(VI) oxide, 1,2-ethylene diphosphonic acid, 4-pyridyltetrazole (4-Hpt) and the appropriate metal acetate yielded a series of three-dimensional bimetallic oxides of the general formula [Mx(4-Hpt)y(H2O)z{Mo5O15(O3PCH2CH2PO3)}]·nhydrate (M = Co or Ni, x = 2, y = 2, z = 6; M = Cu, x = 4, y = 3, z = 1). The Co(II) and Ni(II) phases are isomorphous with structures constructed from the common {Mo5O15(O3PCH2CH2PO3)}n4n− chains linked through binuclear {M2(4-Hpt)2(H2O)6}4+ subunits to provide the three-dimensional connectivity. The copper(I) species consists of the molybdophosphonate chains embedded in a framework of Cu(I) tetrahedra linked through the tetrazole nitrogen donors of the 4-Hpt ligands.