A new tetradentate tripodal ligand (L3) containing sterically bulky imidazolyl groups was synthesized, where L3 is tris (1-methyl-2-phenyl-4-imidazolylmethyl) amine. Reaction of a bis (μ-hydroxo) dicopper (II) complex,[Cu2 (L3) 2 (OH) 2] 2+(1), with H2O2 in acetonitrile at- 40° C generated a (μ-1, 1-hydroperoxo) dicopper (II) complex [Cu2 (L3) 2 (OOH)(OH)] 2+(2), which was characterized by various physicochemical measurements including X-ray ...