Formation and spectral characterization of Cu(II)-poly(L-ornithine) complexes.
Cu(II)-Poly-(1-ornithine) complexes in aqueous solution have been studied using potentiometric titration and absorption and circular dichroism spectra. As in the case of Cu(II)-poly(L-arginine) complexes studied previously, two types of compounds have been detected, labeled complexes I and II. Complex I contains two amine nitrogens and two water molecules coordinated to the copper. Complex II, two amine and two amide nitrogens. Amide nitrogen coordination confers optical activity to the copper d-d transitions. Furthermore, amine and amide nitrogen coordination to the copper are characterized by charge transfer transitions at 250 and 320 nm respectively which were already identified in Cu(II)-poly(L-arginine) systems.
D002413:Cations, Divalent; D002942:Circular Dichroism; D003300:Copper; D006863:Hydrogen-Ion Concentration; D009952:Ornithine; D010455:Peptides; D011199:Potentiometry; D011487:Protein Conformation; D013053:Spectrophotometry; D014461:Ultracentrifugation
D002413:Cations, Divalent; D010455:Peptides; D003300:Copper; D009952:Ornithine