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Manganese(ii) complex of an oxygen–nitrogen donor Schiff base ligand showing efficient catechol oxidase activity: synthesis, spectroscopic and kinetic study

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Abstract

Tridentate O,N,O-donor Schiff base ligand (E)-1-(2-hydroxybenzylidene)semicarbazide (H2L1) and its Mn(II) complex have been synthesized. Both the ligand and the complex have been characterized by analytical and spectroscopic techniques. X-ray crystal structure determination of the Mn(II) complex shows that the Mn(II) atom is in a distorted octahedral environment and there are two crystallographically different manganese atoms in the unit cell. The Mn(II) complex shows very high catalytic activity for catechol oxidation (kcat = 3.10 × 106 h−1, kcat/KM = 3.25 × 108 h−1 M−1), which is the highest catalytic efficiency for catechol oxidation by a manganese complex reported in the literature. The probable mechanism of the catalytic reaction is explored using ESI-MS and EPR spectroscopy.

Graphical abstract: Manganese(ii) complex of an oxygen–nitrogen donor Schiff base ligand showing efficient catechol oxidase activity: synthesis, spectroscopic and kinetic study

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Article information


Submitted
05 Sep 2019
Accepted
01 Feb 2020
First published
05 Feb 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Manganese(II) complex of an oxygen–nitrogen donor Schiff base ligand showing efficient catechol oxidase activity: synthesis, spectroscopic and kinetic study

P. Adak, A. Mondal and S. K. Chattopadhyay, New J. Chem., 2020, Advance Article , DOI: 10.1039/C9NJ04591K

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