Two new transition-metal complexes (TMCs)-templated three-dimensional supramolecular networks based on tungstovanadophosphates

摘要

Two new polyoxometalates [Ni(phen)(3)](Ni(en)(3)][Ni(en)(2)(H2O)(2)][Ni(en)(2)](0.5)[(PW7W2V3O40)-W-VI-V-V-O-IV((VO)-O-IV)(2)] center dot 6H(2)O (1) and [Ni(phen)(3)](2)[Ni(en)(2)]Na[(PW7W2V3O40)-W-VI-V-V-O-IV((VO)-O-IV)(2)] 8H(2)O (2) (en = ethylenediamine, phen = 1,10-phenanthroline) have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR, EPR, XPS, elemental analysis and thermogravimetry. Their structures exhibit interesting 3D supramolecular networks, and contain new bicapped (pseudo-) Keggin-type tungsten-vanadium cluster and the template transition-metal complexes (TMCs) being generated in situ under mild hydrothermal conditions. Interestingly, compound 1 contains four different kinds of nickel complex countercations.