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Syntheses, crystal structures, DNA binding and electrochemical properties of two mixed-ligand cobalt(II) coordination polymers constructed from 5-(carboxymethoxy)isophthalic acid and bis-benzimidazole ligands

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Abstract

Two new cobalt(II) coordination polymers, [Co(HL)(bbe)] n (1) and [Co(HL)(bbop)] n (2) (H3L = 5-(carboxymethoxy)isophthalic acid, bbe = 1,2-bis(benzimidazol-2-yl)ethane, bbop = 1,3-bis(benzimidazol-2-yl)-2-oxapropane), were synthesized and characterized by elemental analyses, IR spectra, single-crystal X-ray diffraction and thermogravimetric analyses. Both complexes exhibit 1D chain structures, constructed from HL2− anions bridging metal ions. The 1D chains are further connected by hydrogen bonds and π–π stacking interactions to form the 3D supramolecular architectures. The cobalt centers display different coordination environments, with a tetrahedral geometry in 1 and a distorted tetragonal pyramid in 2. The DNA binding properties of both complexes were investigated by UV absorption spectroscopy. The electrochemical properties of both complexes were studied by cyclic voltammetry.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 20971076).

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Correspondence to Yong-Hong Wen.

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Wen, H., Wang, D., Mu, X. et al. Syntheses, crystal structures, DNA binding and electrochemical properties of two mixed-ligand cobalt(II) coordination polymers constructed from 5-(carboxymethoxy)isophthalic acid and bis-benzimidazole ligands. Transition Met Chem 40, 509–517 (2015). https://doi.org/10.1007/s11243-015-9943-0

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Keywords

  • Coordination Polymer
  • Carbon Paste Electrode
  • Isophthalic Acid
  • Organic Coordination Polymer
  • Carboxymethoxy