Zn(2,2′-bipy)2/Co(2,2′-bipy)2 linked decaniobate [Nb10O28]6− clusters–zigzag neutral chains

Two isostructural decaniobate polymers {[Zn(2,2′-bipy)2]3[Nb10O28] · 3H2O}n (1) and {[Co(2,2′-bipy)2]3[Nb10O28] · 1.5H2O}n (2) have been assembled successfully based on [M(2,2′-bipy)2] (M = Zn and Co) and metastable [Nb10O28]6− clusters under mild hydrothermal condition. The two compounds have been characterized by IR, TG analysis and single-crystal X-ray diffraction. The decaniobate [Nb10O28]6− linked by Zn(2,2′-bipy)2 or Co(2,2′-bipy)2 is first observed in polyoxoniobate chemistry as the first examples of decaniobate polymers.