Biimidazole containing cobalt(III) mixed ligand complexes: Crystal structure and photonuclease activity.

Two new mixed ligand complexes of cobalt(iii) containing ancillary biimidazole ligands, [Co(phen)(2)H(2)biim](ClO(4))(3).0.5(H(7)O(3))(ClO(4)) (1) and [Co(bpy)(2)H(2)biim](ClO(4))(3).

Cobalt complexes of terpyridine ligand: crystal structure and photocleavage of DNA.

Two new cobalt complexes, [Co(pytpy)(2)](ClO(4))(2), 1, and [Co(pytpy)(2)](ClO(4))(3), 2 where pytpy=pyridine terpyridine, have been synthesized and characterized. Single-crystal X-ray structure of both the complexes has been resolved. The structure shows the complexes to be a monomeric cobalt(II) and cobalt(III) species with two pytpy ligands coordinated to the metal ion to give a six coordinate complex.