Hydrothermal syntheses and characterizations of two novel heteropolytungstate supported coordination compounds

Two novel heteropolytungstates, [Ni(2,2′-bpy)3]1.5{PW10.79V1.21O40(VO)0.5[Ni(2,2′-bpy)2L]} · 0.5H2O (1) (2,2′-bpy = 2,2′-bipyridine, L = 0.5H2O + 0.5OH−) and K[PW12O40[Ni(1,10-phen)2(OH)]2] · 2H2O (2) (1,10-phen = 1,10-phenanthroline), have been synthesized under hydrothermal conditions and characterized by IR, XPS, and X-ray diffraction analyses. The polyoxoanion of 1 is a mono-capped α-Keggin cluster which supports a metal coordination fragment [Ni(2,2′-bpy)2L]1.5+, while the structure of 2 exhibits a 1D chain constructed from pseudo-Keggin cluster bi-supported transition metal complexes linked by K+ ions. Studies of magnetic properties indicated the presence of paramagnetic behaviours for compounds 1 and 2.