Coordination Chemistry of the Magic Inorganic Building Block {FeII[Mo6P4O31]2}: Hydrothermal Synthesis and Crystal Structure of a New Reduced Ferrous Molybdophosphate

摘要

A new reduced ferrous molybdophosphate composite solid of the formula, [(C10H14N2)H]4[FeII 10MoV 24(H2PO4)4(HPO4)12(PO4)4(H2O)16(OH)16O44]·12H2O, has been synthesized from a reaction mixture of MoO3, FeSO4·7H2O, C2H2O4·2H2O, nicotine, H3PO4, and H2O under hydrothermal conditions. The crystal data: monoclinic, space group C2/m, a = 24.4349(124), b = 12.9935(66), c = 14.7281(74) Å, β = 104.87(1) Å, V = 4520(4) Å3, Z = 2, R 1 = 0.0874, wR 2 = 0.2179. The structure is built from the building blocks of the formula, {FeII[Mo6P4O31]2}, consisting of a network of MO6 (M = Fe, Mo) octahedral and PO4 tetrahedral linked through their vertices. The connectivity of the building blocks with two pairs of face-sharing dinuclear Fe(II) clusters of the formula of [FeII 2(H2O)4O5] on which a phosphate group is hanging gives rise to one-dimensional chains with eight-membered apertures. The remarkable hydrogen bonded interactions between the chains form a unique and interesting framework with three-dimensional intersecting tunnels where the protonated nicotine molecules as structuring templates and crystallization water molecules are situated.