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Copper(II) Mononuclear Complexes Incorporating Pyridine Derivatives: Synthesis, Structural Characterization, and Unusual X-Band epr Spectra

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Abstract

Two new copper(II) complexes [Cu(L1)2(NO3)]NO31 and [Cu(L2)(H2O)2](NO3)22(L1 = 2(2-pyridyl)benzimidazole and L2 = 2-benzoylpyridine) have been prepared and characterized by elemental and spectral (UV–visible, FTIR and epr) techniques. Crystal structures of these complexes were determined using single crystal X-ray diffraction analysis. The low value of magnetic moments 1.75 BM for 1 and 1.73 BM for 2 and unusual X-band epr spectral pattern authenticate the antiferromagnetic behavior of complexes. The single crystal X-ray analysis reveals the development of supramolecular architectures through various non-covalent weak interactions such as CH \(\cdots\uppi\) and lp \(\cdots\uppi\) interactions. In order to see the stability of complexes, density functional theory (DFT) calculations were carried out. From the energy gap (ΔE) of frontier molecular orbitals (various molecular descriptors were also evaluated. In addition, superoxide dismutase SOD) activities of both complexes were also determined. The enhanced SOD activity of 1 is due to loosely bound nitrate ion.

Graphical Abstract

Two new copper(II) complexes [Cu(L1)2(NO3)]NO3 and [Cu(L2)(H2O)2](NO3)2 (L1= 2(2-pyridyl)benzimidazole and L2= 2-benzoylpyridine) have been prepared and characterized by elemental, spectral, and single crystal diffraction techniques

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Acknowledgements

The authors are thankful to the Head Department of Chemistry, A.P.S. University, Rewa for providing necessary facilities required to perform this work. The authors are also thankful to SAIF, CDRI Lucknow for microanalysis. Financial assistance from CSIR [Scheme No. 01(2917)/18/EMR-II] New Delhi are also gratefully acknowledged.

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Author notes

  1. R. N. Patel, and S. K. Patel have contributed equally to this work.

Authors and Affiliations

  1. Department of Chemistry, APS University, Rewa, 486003, India

    R. N. Patel, D. Kumhar, S. K. Patel, A. K. Patel & N. Patel

  2. Department of Inorganic and Structural Chemistry, Howard University, Washington, DC, 22031, USA

    R. J. Butcher

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  1. R. N. Patel
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Correspondence to R. J. Butcher.

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Dedicated to late Prof. Jerry P. Jasinski.

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Patel, R.N., Kumhar, D., Patel, S.K. et al. Copper(II) Mononuclear Complexes Incorporating Pyridine Derivatives: Synthesis, Structural Characterization, and Unusual X-Band epr Spectra. J Chem Crystallogr 52, 378–393 (2022). https://doi.org/10.1007/s10870-022-00926-4

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