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| Synthesis, Crystal Structures and DNA Interaction of Cu(Ⅱ), Zn(Ⅱ), Co(Ⅱ), and Mn(Ⅱ) Complexes Derived from Zwitterionic Carboxylate Ligand |
| Author Name | Affiliation | E-mail | | CHEN Ming-Zhen | Department of Pharmacy, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, China | | | CHEN Jin-Xiang | NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China | | | WANG Ruo-Lun | Department of Pharmacy, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, China | | | LU Jun-Xiong | Department of Pharmacy, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, China | | | XU Xue-Fei | Department of Pharmacy, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, China | xuxuefei0731@163.com |
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| Abstract: Four new metal complexes, namely [Cu2(Cbiq)4(H2O)2]Br4·2H2O (1), [Zn(Cbiq)2(H2O)2]Br2·Cbiq·H2O (2), and [M3(Cbiq)8(μ-OH)2(H2O)2](ClO4)4·7H2O (M=Co (3), Mn (4)), were synthesized from the zwitterionic carboxylate ligand N-(4-carboxybenzyl)isoquinolinium bromide ((HCbiq)Br) with the corresponding metal salts. All these metal complexes were characterized by single crystal X-ray diffraction, elemental analyses, and IR. In complex 1, the centrosymmetric binuclear Cu(Ⅱ) are bridged by four Cbiq molecules and each Cu(Ⅱ) ion is further coordinated to one water molecule. In complex 2, the center Zn(Ⅱ) ion is coordinated to two unidentate Cbiq molecules and two water molecules. Complexes 3 and 4 have similar structures in which every two M(Ⅱ) ions are bridged by two Cbiq molecules and one hydroxo-O atom and the two peripheric M(Ⅱ) ions are further coordinated to two unidentate Cbiq molecules and one water molecule. Agarose gel electrophoresis (GE) studies on the cleavage of plasmid pBR322 DNA by complexes 1-4 indicated that complex 1 was capable of efficiently cleaving DNA under physiological conditions, most probably via an oxidative mechanism. Kinetic assay of complex 1 afforded the maximal catalytic rate constant kmax of 2.80 h-1 and Michaelis constant KM of 3.22 mmol·L-1. Ethidium bromide (EB) displacement experiments indicated that complex 1 exhibited high DNA binding affinity toward calf-thymus (CT) DNA. The docking method was used to predict the CT DNA binding affinity of complex 1, with the result that the binding free energy was-49.87 kJ·mol-1. |
| Keywords: zwitterionic carboxylate ligand transition metal complexes crystal structures DNA |
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| CHEN Ming-Zhen,CHEN Jin-Xiang,WANG Ruo-Lun,LU Jun-Xiong,XU Xue-Fei.Synthesis, Crystal Structures and DNA Interaction of Cu(Ⅱ), Zn(Ⅱ), Co(Ⅱ), and Mn(Ⅱ) Complexes Derived from Zwitterionic Carboxylate Ligand[J].Chinese Journal of Inorganic Chemistry,2022,38(12):2499-2510. |
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