A new two-fold interpenetrated three-dimensional compound based on metal-organic coordination polymers and {V4O12} clusters: [Cu(bipy)]4V4O12·2H2O (bipy=4,4′-bipyridine)

A new composite material [Cu(bipy)]4V4O12·2H2O(bipy=4,4′-bipyridine) (1) has been synthesized using hydrothermal technology. 1 is a two-fold interpenetrating three-dimensional structure composed of {V4O12}4− rings covalently attached by four {Cu(bipy)}+ moieties through the terminal oxo groups of vanadium sites. Compound 1 is the first example of interpenetrating (3,4)-connected network constructed from metal-organic polymers and polyoxometalates. Interestingly, Cu(I) atoms have a T configuration and {V4O12}4− rings link to [{Cu(bipy)}+]n chains via two different connecting behaviors.