Issue 35, 2017

Unprecedented tetranuclear complexes with “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(μ-L)4(μ-CH2(COO)2)(H2O)3](NO3)2·4H2O (1) and [Cu4(μ-L)4(μ-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. The goal for our research work is to understand the factors that govern the stability of the Cu–O(–O–C–O–) bond towards reactive oxygen species (ROS) in Cu-containing mimics utilizing a systematic approach. The antioxidant superoxide dismutase measurements indicate that these complexes behave as superoxide dismutase mimics.

Graphical abstract: Unprecedented tetranuclear complexes with “weighing balance shaped” topology: single crystal structures, unusual EPR spectra, magnetic properties and antioxidant activity

Supplementary files

Article information

Article type
Paper
Submitted
17 Jul 2017
Accepted
11 Aug 2017
First published
11 Aug 2017

Dalton Trans., 2017,46, 11860-11874

Unprecedented tetranuclear complexes with “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, R. J. Butcher, J. P. Jasinski, E. Colacio and M. A. Palacios, Dalton Trans., 2017, 46, 11860 DOI: 10.1039/C7DT02595E

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