A bipyridine is any of six isomeric bicyclic heterocycles consisting of two pyridine molecules directly linked, of which their derivatives have many industrial applications.
The oxidation number of bipyridine is 0 because each nitrogen atom has an oxidation number of -3 in this aromatic compound, and each carbon atom has an oxidation number of -2. The sum of the oxidation numbers in bipyridine adds up to 0.
Michelle L. Jackson has written: 'N-alkylated derivatives of 1,4,7-triazacyclononane and polynucleating aza derivatives of 5,5'-ylmethyl-2,2'-bipyridine'
The large bases that have two carbon-nitrogen rings are called purines.
Compounds that contain ligands capable of forming a complex with iron (III) ions can react with iron (III) chloride to give a color change. For example, thiocyanate ion (SCN-) can form a deep red complex with iron (III) ions. Other ligands like phenanthroline, bipyridine, and ferrocyanide can also produce color changes when they react with iron (III) chloride due to the formation of coordination complexes.