A novel Lindqvist type polyoxoniobate coordinated to four copper complex moieties: {Nb6O19[Cu(2,2′-bipy)]2[Cu(2,2′-bipy)2]2} · 19H2O

A novel polyoxoniobate derivative {Nb6O19[Cu(2,2′-bipy)]2[Cu(2,2′-bipy)2]2} · 19H2O 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 [Nb6O19]8− is capped by two divalent Cu atoms through three bridging oxygen atoms on two opposite {Nb3O3} groups and supports two [Cu(2,2′-bipy)2] fragments via the terminal oxygen atoms which are also located in opposite orientations.