1) Chelating agent 
Bipyridines are a family of chemical compounds with the formula (C5H4N)2, which are formed by the coupling of two pyridine rings. Six isomers of bipyridine exist, but two isomers are prominent: 2,2`-bipyridine is a popular ligand in coordination chemistry and 4,4`-bipyridine is a precursor to the herbicide paraquat. The bipyridines are colourles.....