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Synthesis, Structure and DNA Binding Properties of [Cu2(heae)(SCN)2] n  · nH2O the First One-Dimensional Polymeric Copper(II) Complex Bridged Alternately by Oxamidate and Double End-to-End Thiocyanate Ligands

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Abstract

A new one-dimensional polymeric copper(II) complex, [Cu2(heae)(SCN)2] n  · nH2O [H2heae is N,N′-bis(N-hydroxyethylaminoethyl)oxamide], has been synthesized and characterized by elemental analysis, molar conductivity measurement, IR and electronic spectra studies, and single-crystal X-ray diffraction. The structure of the complex exhibits a neutral one-dimensional polymeric copper(II) zigzag chain [Cu2(heae)(SCN)2] n constructed by μ-trans-heae and double μ-1,3-thiocyanate ligands. The environment about copper can be described as a square-pyramid. The neighboring second building units (SBUs), [Cu(trans-heae)Cu]2+, are unequal with Cu···Cu separations of 5.287 and 5.273 Å for Cu1···Cu1i and Cu2···Cu2ii, respectively. The double thiocyanate ligands function as μ(1,3)-bridges to link these unequal SBUs thereby forming zigzag chains with a Cu1···Cu2 separation of 5.454 Å. The hydrogen bonds in the crystal structure self-assemble the one-dimensional chains into a three-dimensional supramolecular structure. The interaction of the polymeric copper(II) complex with herring sperm DNA (HS-DNA) has been investigated by using absorption and emission spectra, electrochemical techniques and viscometry. The results reveal that the polymeric copper(II) complex interacts with HS-DNA via a groove binding mode with the intrinsic binding constant of 1.38 × 104 M−1. To the best of our knowledge, this is the first example about the structure and DNA-bonding studies of a one-dimensional polymeric copper(II) complex that is bridged alternately by trans-oxamidate and double-thiocyanate ligands.

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Acknowledgments

This project was supported by the National Natural Science Foundation of China (No. 30672515), the Ph.D. Program Foundation of Ministry of Education of China and the Natural Science Foundation of Qingdao City (No. 06-2-2-11-jch).

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Authors and Affiliations

  1. Marine Drug & Food Institute, Ocean University of China, 5 Yushan Road, Qingdao, Shandong, 266003, People’s Republic of China

    Man Jiang, Yan-Tuan Li & Xia Wu

  2. Key Lab. Marine Drug, Chinese Minist. Educ., Ocean University of China, Qingdao, Shandong, 266003, People’s Republic of China

    Zhi-Yong Wu & Zhi-Qiang Liu

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  1. Man Jiang
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  2. Yan-Tuan Li
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  3. Zhi-Yong Wu
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Correspondence to Yan-Tuan Li.

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Jiang, M., Li, YT., Wu, ZY. et al. Synthesis, Structure and DNA Binding Properties of [Cu2(heae)(SCN)2] n  · nH2O the First One-Dimensional Polymeric Copper(II) Complex Bridged Alternately by Oxamidate and Double End-to-End Thiocyanate Ligands. J Inorg Organomet Polym 18, 448–456 (2008). https://doi.org/10.1007/s10904-008-9224-x

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