Citation: LI Zhi-Xi, HU Ming, LIU Chao, YANG Xiao-Liang. Structural Characterization and Artificial Nuclease Activity of Transition Metal Complexes of Cyclam Derivatives[J]. Chinese Journal of Inorganic Chemistry, ;2015, (1): 127-132. doi: 10.11862/CJIC.2015.023
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Acyclam-based ligand: tetratert-butyl ((4,11-dimethyl-1,4,8,11-tetraazacyclotetradecane-1,8-diyl)bis (propane-3,2,1-triyl)) tetracarbamatev (L1), and its metal complexes [Zn(L1)Cl2] (1), [Ni(L1)Cl2] (2) and [Cu(L1)Cl2] (3) were designed and synthesized. L1 has a C2 symmetrical structure and the 1H chemical shift of the same carbon was different because of the influence of cyclam ring. The metal binding site of the L1 was confirmed by 2D [1H, 15N] HSQC by comparing the chemical shift of N of the branched chains of the ligand that of with the corresponding metal complex. The co-existence of two configuration was characterized by 13C VT NMR combined with 2D [1H, 15N] HSQC NMR and trans-Ⅲ was confirmed to be the main configuration for complex 1. The cleavage activity of the ligand L1 and the complexes 1~3 was investigated in detail under physiological conditions. Agarose gel electrophoresis experiments showed that the complex 3 possesses interesting nuclease activity in the present of ascorbate; No matter the hydrolysis or oxidation, the ligand L1 and complex 1, and 2 were negative to DNA at the experimental conditions.
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