n = 4和n = 25时(L赖氨酸)n- cu (II) (I:I)体系的圆二色性研究

Arlette Garnier, Lucia Tosi
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引用次数: 11

摘要

利用圆不差性(CD)数据对n = 4和n = 25的(L赖氨酸)n- cu (II) (I:I)体系进行了研究,提供了在两步过程中形成两个配合物的证据。在pH 6.6下得到的第一个配合物中,α-氨基末端基团和相邻的去质子化酰胺氮与金属结合。在第二种结构中,侧链上附加的氨基氮位于配位方阵的另外两个角。对发生配位时以特殊模式发生的变化进行全面调查,可以确定每种氮配位类型的三个特征带。
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Circular dichroism investigation of the (L Lysine)n-Cu(II) (I:I) System with n = 4 and n = 25

The study of the (L Lysine)n-Cu(II) (I:I) system with n = 4 and n = 25 using circular dischroism (CD) data has provided evidence indicating the formation of two complexes in a two-atep process. In the first of these complexes, obtained at pH 6.6 the α-amino terminal group and the adjacent deprotonated amide nitrogen are bound to the metal. In the second, additional amino nitrogens of side chains lie at the other two corners of the coordination square.A comprehensive investigation of changes occuring in special patterns when coordination takes place enables the assignment of three bands that are characteristic to each type of nitrogen coordination.

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