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Structure and properties of a novel staircase-like decanuclear [CuII10] cluster supported by carbonate and carboxylate bridges

Abstract

This article describes a novel staircase-like decanuclear copper(II) cluster [CuII10(cpdp)4(CO3)4(CH3OH)2]•3.33CH3OH•7.83H2O (1) (H3cpdp = N,N'-Bis[2-carboxybenzomethyl]-N,N'-Bis[2-pyridylmethyl]-1,3-diaminopropan-2-ol) composed of a pair of [CuII5] pentamers. In methanol, the reaction of H3cpdp with Cu(NO3)2•3H2O in the presence of K2CO3 leads to the isolation of complex 1. This complex has been characterized by various analytical techniques including single crystal X-ray crystallography. Structural analysis reveals that the two [CuII5] pentameric units are bridged together exclusively by two μ2:η2:η1 carbonate groups. Complex 1 shows a rare μ3:η2:η1:η1 bridging coordination mode of four benzoate groups of cpdp3- ligands with each bridging among three copper(II) ions. Complex 1 also represents the first example of a carbonate-coordinated decanuclear copper(II) cluster with any class of bridging or non-bridging ligand. Thermal, magnetic, EPR and electrochemical properties of this complex have been discussed. Variable temperature magnetic measurement discloses the antiferromagnetic interactions among the copper(II) ions. Electrochemical investigation of 1 in methanol solution using cyclic voltammetry reveals the presence of one metal-based quasi-reversible reduction at 870 mV (∆Ep = 190 mV).

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Publication details

The article was received on 28 Sep 2017, accepted on 28 Nov 2017 and first published on 28 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ03714G
Citation: New J. Chem., 2017, Accepted Manuscript
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    Structure and properties of a novel staircase-like decanuclear [CuII10] cluster supported by carbonate and carboxylate bridges

    M. N. Bera, S. Haldar, G. Vijaykumar, L. Carrella and G. T. Musie, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03714G

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