A building block approach to the synthesis of organic–inorganic oxide materials: the hydrothermal synthesis and network structure of [{Ni4(tpypyz)3}{Mo5O15(O3PCH2CH2PO3)}2]·23H2O (tpypyz = tetra-2-pyridylpyrazine)

Abstract
The hydrothermal reaction of MoO3, [Ni(CH3CO2)2]·4H2O, tpypyz, ethylenediphosphonic acid and water yields the 2D material [{Ni4(tpypyz)3}{Mo5O15(O3PCH2CH2PO3)}2]·23H2O (1·23H2O), 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+.

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