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Abstract
Three 1-D reduced molybdenum(V) phosphates, [Ni(OH)2][Na2(H2O)3]2{Ni[(MoO2)6(OH)3(HPO4)3(PO4)]2} · 2C6H14N2 · 2H3O · 5H2O (1), [Ni(H2O)2][K(H2O)5]2{Ni[(MoO2)6(OH)3(HPO4)3(PO4)]2} · 2C6H14N2 · 2H3O · 4H2O (2), and [Cu(H2O)2][Na(H2O)5]2{Cu[(MoO2)6(OH)3(HPO4)3(PO4)]2} · 2C6H14N2 · 2H3O · 4H2O (3), have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. The crystallographic analysis reveals that 1 is based on {Ni[Mo6O12(OH)3(HPO4)3(PO4)]2} clusters connected through {[Ni(OH)2][Na2(H2O)3]2} pentanuclear mixed-metal cluster units to yield unusual 1-D chains along the c-axis, which further form 3-D supramolecular networks via hydrogen-bonding. Compounds 2 and 3 are heterogeneous isostructural compounds. Both are built from M[Mo6P4]2 (M = Ni or Cu) blocks as the structural motif combined with [MO4(H2O)2] (M = Ni or Cu) octahedra to form 1-D chains, where M[Mo6P4]2 (M = Ni or Cu) is bonded by [M′(H2O)5] (M′ = K or Na). Furthermore, bulk carbon paste electrode modified with 1 (1-CPE) displays good electrocatalytic activity toward reduction of nitrite or bromate.
Acknowledgments
This work was financially supported by National Science Foundation of China, Grant Nos 20771024 and 21051003, and the Key Project Fund of Science and Technology of Fujian Province, China, Grant No. 2008I0013.