Volume 32, Issue 5 e4297
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Dinuclear Cu(II) complexes based on p-xylylene-bridged bis(1,4,7-triazacyclononane) ligands: Synthesis, characterization, DNA cleavage abilities and evaluation of superoxide dismutase- and catalase-like activities

Qi Tang

Qi Tang

Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmacy of Guangxi Normal University, Guilin, People's Republic of China

These authors contributed equally to this work.Search for more papers by this author
Ji-Qing Wu

Ji-Qing Wu

Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmacy of Guangxi Normal University, Guilin, People's Republic of China

These authors contributed equally to this work.Search for more papers by this author
Hong-Yan Li

Hong-Yan Li

Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmacy of Guangxi Normal University, Guilin, People's Republic of China

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Yan-Fang Feng

Yan-Fang Feng

Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmacy of Guangxi Normal University, Guilin, People's Republic of China

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Zhong Zhang

Corresponding Author

Zhong Zhang

Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmacy of Guangxi Normal University, Guilin, People's Republic of China

Correspondence

Zhong Zhang and Yu-Ning Liang, School of Chemistry and Pharmacy of Guangxi Normal University, Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), Guilin, People's Republic of China.

Email: [email protected]; [email protected]

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Yu-Ning Liang

Corresponding Author

Yu-Ning Liang

Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmacy of Guangxi Normal University, Guilin, People's Republic of China

Correspondence

Zhong Zhang and Yu-Ning Liang, School of Chemistry and Pharmacy of Guangxi Normal University, Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), Guilin, People's Republic of China.

Email: [email protected]; [email protected]

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First published: 13 March 2018
Citations: 6

Abstract

Three new dinuclear Cu(II) complexes with the formulas [Cu2(pxdmbtacn)Cl4] (1), [Cu2(pxdmbtacn)Cl0.7(NO3)1.3(OH)2(H2O)1.3]⋅6H2O (2) and [Cu2(pxdiprbtacn)Cl4] (3) together with one previously reported complex, [Cu2(pxbtacn)Cl4] (4), were obtained from Cu(II) salts with three p-xylylene-bridged bis-tacn ligands bearing pendant alkyl substituents or without pendant group. Complex 2 was structurally characterized as a centrosymmetric dinuclear molecule with each metal center being coordinated to some labile ligands in addition to one tacn ring. Based on the results of mass spectrometry and UV–visible spectroscopy, complexes 1 and 3 are capable of existing in aqueous solution as dinuclear species but 4 can partially form a dimer of the original dinuclear motif. Complexes 1, 3 and 4 can all effectively cleave supercoiled DNA oxidatively in the presence of hydrogen peroxide. The superoxide dismutase (SOD) activities of 1 and 3 measured under physiological conditions are comparable to that of the native CuZnSOD enzyme but the enzymatic activity of 4 is about three- to fourfold lower. Furthermore, complexes 1, 3 and 4 demonstrate moderate scavenging effect on hydrogen peroxide and their catalase activities are in the decreasing order of 3 > 1 > 4.

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