A novel Lindqvist type polyoxoniobate coordinated to four copper complex moieties: {Nb6O19[Cu(2,2 '-bipy)](2)[Cu(2,2 '-bipy)(2)](2)} center dot 19H(2)O

A novel polyoxoniobate derivative [Nb6O19[Cu(2,2'-bipy)](2)[Cu(2,2'-bipy)(2)](2)) center dot 19H(2)O 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. (c) 2007 Elsevier B.V. All rights reserved.