Formation and spectral characterization of Cu(II)-Poly(L-Ornithine) complexes

Canh-Vang Phan Lucia Tosi, Arlette Garnier
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引用次数: 16

Abstract

Cu(II)-Poly-(l-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.

Cu(II)-聚(l -鸟氨酸)配合物的形成和光谱表征
用电位滴定法、吸收光谱和圆二色光谱研究了水溶液中的Cu(II)-聚(l-鸟氨酸)配合物。与之前研究的Cu(II)-聚l -精氨酸配合物一样,已经检测到两种类型的化合物,标记为配合物I和II。配合物I含有两个胺氮和两个与铜配位的水分子。配合物II,两个胺氮和两个酰胺氮。酰胺氮配位使铜的d-d跃迁具有光学活性。此外,在Cu(II)-聚l -精氨酸体系中已经发现了250 nm和320 nm的电荷转移跃迁,从而表征了胺氮和酰胺氮与铜的配位。
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