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Synthesis and crystal structures of N,N'-bis(5-methylsalicylidene)ethane-1,2-diamine and its bromido-, phenolato-, and dicyanoamido-cobridged polymeric copper(II) complex

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Abstract

A bis-Schiff base N,N'-bis(5-methylsalicylidene)ethane-1,2-diamine (H2L) was prepared and characterized by elemental analysis, 1H NMR and 13C NMR spectra, MS, and single crystal X-ray diffraction (CIF file CCDC no. 1022761 (H2L)). Reaction of the Schiff base with copper bromide and sodium dicyanoamide in methanol gave a novel bromido-, phenolato-, and dicyanoamido-cobridged polymeric copper(II) complex, ({Cu2LBr[N(CN)2]}2)n (I). Structure of complex I was characterized by elemental analysis and single crystal X-ray diffraction (CIF file CCDC no. 1022762 (I)). The smallest repeat unit of complex I is a dicyanoamide bridged tetranuclear copper(II) complex moiety, {Cu2LBr[N(CN)2]}2, in which there possesses a crystallographic inversion symmetry. The tetranuclear moieties are further linked through Br atoms, forming a zigzag chain. The chains are further linked by dicyanoamide ligands, forming a 2D network. One Cu atom in complex I is coordinated by two N and two O atoms of the Schiff base ligand and one Br atom, forming square pyramidal geometry. The other Cu atom is coordinated by two N atoms of the Schiff base ligand, two N atoms of dicyanoamide ligands, and one Br atom, forming square pyramidal geometry. The bromido-, phenolato-, and dicyanoamido-cobridged Cu···Cu distances are 4.823(2), 2.955(1), and 7.121(3) Å, respectively. The [Cu2L] units are linked by the bridging groups, to form 2D chains along the xy plane.

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Authors and Affiliations

  1. College of Science and Technology, Ningbo University, Ningbo, 315212, P.R. China

    X. Y. Qiu

  2. Department of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, 16029, P.R. China

    Y. T. Gu, Y. T. Li, D. M. Xian & Z. L. You

  3. School of Life Sciences, Shandong University of Technology, ZiBo, 255049, P.R. China

    H. L. Zhu

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  1. X. Y. Qiu
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  2. Y. T. Gu
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Qiu, X.Y., Gu, Y.T., Li, Y.T. et al. Synthesis and crystal structures of N,N'-bis(5-methylsalicylidene)ethane-1,2-diamine and its bromido-, phenolato-, and dicyanoamido-cobridged polymeric copper(II) complex. Russ J Coord Chem 43, 331–337 (2017). https://doi.org/10.1134/S1070328417050062

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  • DOI: https://doi.org/10.1134/S1070328417050062

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