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Issue 14, 2014
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Methylene bridge regulated geometrical preferences of ligands in cobalt(III) coordination chemistry and phenoxazinone synthase mimicking activity

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Abstract

Two new azide bound cobalt(III) complexes, [Co(L1)(N3)3] (fac-1) and [Co(L2)(N3)3] (mer-2), where L1 is bis(2-pyridylmethyl)amine and L2 is (2-pyridylmethyl)(2-pyridylethyl)amine, derived from tridentate reduced Schiff-base ligands have been reported. Interestingly, a methylene bridge regulated preferential coordination mode of ligands is noticed in their crystal structures: it is found in a facial arrangement in fac-1 and has a meridional disposition in mer-2. Both complexes show phenoxazinone synthase-like activity and the role of the structural factor on the catalytic activity is also explored. Moreover, the easily reducible cobalt(III) center in mer-2 favors the oxidation of o-aminophenol. The ESI-MS positive spectra together with UV-vis spectroscopy clearly suggest the formation of a catalyst–substrate adduct by substitution of the coordinated azide ions in the catalytic cycle.

Graphical abstract: Methylene bridge regulated geometrical preferences of ligands in cobalt(iii) coordination chemistry and phenoxazinone synthase mimicking activity

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Publication details

The article was received on 24 Sep 2013, accepted on 31 Dec 2013 and first published on 03 Jan 2014


Article type: Paper
DOI: 10.1039/C3DT52597J
Citation: Dalton Trans., 2014,43, 5443-5452

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    Methylene bridge regulated geometrical preferences of ligands in cobalt(III) coordination chemistry and phenoxazinone synthase mimicking activity

    A. Panja, M. Shyamal, A. Saha and T. K. Mandal, Dalton Trans., 2014, 43, 5443
    DOI: 10.1039/C3DT52597J

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