| Abstract: | Cu(II)-poly(L-lysine) complexes have been studied using potentiometric titrations, optical absorption and circular dichroism spectra. As in the Cu(II)-poly(L-arginine) system studied previously potentiometric and spectral data consistently show that two types of complexes are formed. The first formed below pH 7.6 contains two amine nitrogens and two oxygen from water molecules at the corners of a square in which the metal occupies the center. The second is obtained at pH above 7.6 when the oxygen atoms are replaced by two adjacent peptide nitrogens. |
