Hydrothermal synthesis and crystal structure of a novel 4,4′-bipyridine bridging dumbbell-like dimeric pentamolybdate: [4,4′-H2bipy]3[4,4′-Hbipy]2[(Mo5O17)2(4,4′-bipy)]

A novel dimeric pentamolybdate [4,4′-H2bipy]3[4,4′-Hbipy]2[(Mo5O17)2(4,4′-bipy)], the first example of a 4,4′-bipyridine bridging dumbbell-like polyoxomolybdates, has been prepared by hydrothermal synthesis and characterized by X-ray crystallography.