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Synthesis, structure and phenoxazinone synthase-like activity of three unprecedented alternating CoII–CoIII 1D chains

Abstract

Three new one-dimensional mixed valence coordination polymers {[CoIII(L1)2][CoII(bpy)2]•ClO4•H2O}∞ (1), {[CoIII(L1)2][CoII(phen)2]•ClO4•H2O}∞ (2) and {[CoIII(L2)2][CoII(bpy)(CH3OH)2]•ClO4•H2O}∞ (3) (H2L1 = N-salicylidene-L-alanine, H2L2 =N-salicylidene-L-phenylalanine, bpy = 2,2'-bipyridine and phen = 1,10-phenanthroline) have been synthesized. The structural analysis reveals that the hexa-coordinated CoIII unit, [CoIII(L1)2]¯, formed by two binegative tridentate Schiff base ligands contain uncoordinated oxygen atoms in the pendent carboxylate arm which further link the neighboring [CoII(bpy)2]2+ units to produce the µ1,3 syn-anti carboxylato bridged one-dimensional (1D) coordination polymer in complex 1. Complexes 2 and 3 feature similar syn-anti carboxylato bridged one dimensional coordination polymers formed by joining of alternating CoII and CoIII units. Using o-aminophenol (OAPH) as the substrate, the phenoxazinone synthase-like activity of the complexes have been studied and the turnover numbers (kcat) have been calculated to be 1.2, 11.5, and 2.7 h­1 for 1−3, respectively. The mechanism of phenoxazinone synthase-like activity are proposed on the basis of mass spectral analysis suggesting the cooperativity of CoII and CoIII centres, i.e. CoII centre binds to the incoming substrate molecule, whereas the CoIII centre is involved in electron transfer from the substrate to molecular oxygen.

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Publication details

The article was received on 21 Jun 2019, accepted on 06 Nov 2019 and first published on 06 Nov 2019


Article type: Paper
DOI: 10.1039/C9NJ03236C
New J. Chem., 2019, Accepted Manuscript

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    Synthesis, structure and phenoxazinone synthase-like activity of three unprecedented alternating CoII–CoIII 1D chains

    S. Ganguly, P. Kar, M. Chakraborty, K. Sarkar and A. Ghosh, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ03236C

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