The ability of 1, lO-phenanthroline (I) and 2, 2'-bipyridine (11) to form highly colored complexes with iron (I1) and other metallic ions has long been recognized and has been applied extensively in analytical chemistry for the detection and determination of these cations. In the case of 1, lO-phenanthroline, the synthesis of a large number of
![4,4'-DINITRO-[2,2'-BIPYRIDINE] 1,1'-DIOXIDE Structure](https://image.chemsrc.com/caspic/113/51595-55-2.png)
