Biomimetic catalytic activity and structural diversity of cobalt complexes with N3O-donor Schiff base ligand
authors Jana, NC; Patra, M; Brandao, P; Panja, A
nationality International
journal INORGANICA CHIMICA ACTA
author keywords Biomimetic catalysis; Intermediate; Cobalt complexes; Crystal structures; Mass spectrometry and mechanism
keywords PHENOXAZINONE SYNTHASE; COORDINATION CHEMISTRY; CATECHOL OXIDASE; ANTIMICROBIAL ACTIVITY; MULTIDENTATE LIGANDS; OXIDATION; MIMICKING; MECHANISM; DIOXYGEN; BINDING
abstract This report describes the syntheses and structural characterizations of four new cobalt(III) compounds (1-4) derived from a tetradentate Schiff base ligand and their catalytic oxidation of different o-aminophenols in aerobic condition. X-ray crystal structural studies reveal that both pseudohalide ions and solvents used for the syntheses have significant influence on the structural diversity in these systems. All these compounds show the diverse catalytic activity towards the aerial oxidation of different o-aminophenols. As expected, the substitutionally labile coordination sites available for substrate binding is responsible for significantly higher catalytic activity of 1 and 2 then others. Literature reports reveal that although significant attention has been made to the catalytic oxidation of some substituted o-aminophenols in terms of the isolations and characterizations of their oxidised products with the native enzyme and its models, but the detailed kinetic studies were not available in the literature. Herein, we have examined the detailed kinetic studies of the aerobic oxidation of two substituted o-aminophenols, namely 2-amino-5-methylphenol and 2-amino-4-methylphenol, using 1 and 2 as catalysts. ESI mass spectrometry provides significant information to get insight into the mechanistic details and further disclose that the methyl substation in aromatic ring does not inhibit formation of the complex-substrate aggregate but it resulted the phenoxazine chromophore instead of phenoxazinone chormophore.
publisher ELSEVIER SCIENCE SA
issn 0020-1693
isbn 1873-3255
year published 2019
volume 490
beginning page 163
ending page 172
digital object identifier (doi) 10.1016/j.ica.2019.03.017
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000463348300020
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journal analysis (jcr 2019):
journal impact factor 2.304
5 year journal impact factor 1.926
category normalized journal impact factor percentile 56.667
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