Conclusion
The molecular and solid systems described here represent an interesting class of compounds. [V IV 2 O 2 (OH) 2 (SO 4 )(2,2′-bipyridine) 2 ] and [V IV 2 O 2 (SO 4 ) 2 (2,2′-bipyridine) 2 ] constitute the examples of fully reduced oxovanadium sulfate based hybrid materials with novel extended structures. Their preparations appear to be a significant step towards the development of V/O/SO 4 /organic ligand systems and its potential in providing new materials. These results point out that a large number of oxovanadium sulfate phases incorporating organic ligands with novel structures remain to be discovered. The results also suggest that use of robust rod like organic ligands may lead to the formation of V/O/SO4 2−/organic based composites with three-dimensional structures. Some of these possibilities are being explored in our laboratories and the outcome of this effort will be published elsewhere.