Vibrational investigation on the copper(II) binding mode of carcinine and its pH dependence

Thus, Carc acts as a tri-dentate ligand at neutral pH, mainly giving a monomeric complex, [CuLH−1], containing tautomer I, whereas an oligonuclear complex, probably [Cu4L4H−8], where metal-imidazolate ions connect different ligand molecules, predominates at alkaline pH.