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Unprecedented tetranuclear complexes "weighing balance shaped" topology: Single crystal structures, unusual EPR spectra, magnetic properties and antioxidant activity

Abstract

Using the (2-hydroxy-N'-[(E)-phenyl(pyridin-2-yl)methylidene]benzohydrazide) ligand and dicarboxylate anions (succinate and malonate), two new copper(II) complexes of formula [Cu4(-L)4(-CH2(COO)2)(H2O)3](NO3)2∙4H2O (1) and [Cu4(-L)4(-CH2-CH2(COO)2)(H2O](NO3)2 (2) have been synthesized and characterized by single crystal X-ray diffraction. Complexes 1 and 2 contain a dicarboxylate bridged tetranuclear Cu (II) cationic unit with "weighing balance shaped" topology. These compounds have also been studied by variable temperature magnetic susceptibility measurements, X-band EPR spectroscopy and electrochemistry. The unprecedented tetranuclear copper complexes 1 and 2 exhibit antiferromagnetic interactions between adjacent copper(II) centers with magnetic exchange coupling constants (J) of J1 = ‒6.8 cm‒1, J2= ‒20.6 cm‒1 and g = 2.03 for 1 and J1 = ‒3.1 cm‒1, J2= ‒13.9 cm‒1 and g = 2.02 for 2, respectively. The goal for our research work is to understand the factors that govern reactive oxygen species (ROS) stability of the Cu-O(-O-C-O-) bond in Cu used mimics utilizing a systematic approach. The antioxidant superoxide dismutase measurements indicate that these complexes behave as superoxide dismutase mimics.

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Publication details

The article was received on 17 Jul 2017, accepted on 11 Aug 2017 and first published on 11 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02595E
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Unprecedented tetranuclear complexes "weighing balance shaped" topology: Single crystal structures, unusual EPR spectra, magnetic properties and antioxidant activity

    Y. Singh, R. N. Patel, Y. P. Singh, A. K. Patel, N. Patel, R. Singh, J. P. Jasinski, R. J. Butcher, E. Colacio and M. A. Palacios, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02595E

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