A novel Lindqvist type polyoxoniobate coordinated to four copper complex moieties: {Nb 6O 19[Cu(2,2′-bipy)] 2[Cu(2,2′-bipy) 2] 2} · 19H 2O

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A novel polyoxoniobate derivative {Nb 6O 19[Cu(2,2′-bipy)] 2[Cu(2,2′-bipy) 2] 2} · 19H 2O 1 has been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction method, IR spectroscopy. The structure analysis indicates that the Lindqvist polyoxoniobate [Nb 6O 19] 8− is capped by two divalent Cu atoms through three bridging oxygen atoms on two opposite {Nb 3O 3} groups and supports two [Cu(2,2′-bipy) 2] fragments via the terminal oxygen atoms which are also located in opposite orientations.