A building block approach to the synthesis of organic–inorganic oxide materials: the hydrothermal synthesis and network structure of [{Ni 4 (tpypyz) 3 }{Mo 5 O 15 (O 3 PCH 2 CH 2 PO 3 )} 2 ]·23H 2 O (tpypyz = tetra-2-pyridylpyrazine)

The hydrothermal reaction of MoO3, [Ni(CH3CO2)2] x 4H2O, tpypyz, ethylenediphosphonic acid and water yields the 2D material [[Ni4(tpypyz)3][Mo5O15(O3PCH2CH2PO3)]2] x 23H2O (1 x 23H2O), constructed from [Mo5O15(O3PCH2CH2PO3)]4- clusters linked in one-dimension through the ethylene tethers of the diphosphonate component; these molybdodiphosphonate chains are in turn linked into a 2D network through the tetranuclear secondary metal-ligand subunit [Ni4(tpypyz)3]8+.