Catechol oxidation promoted by bridging phenoxo moieties in a bis(μ-phenoxo)-bridged dicopper(ii ) complex
| Autor: | Probal Nag, Sivaranjana Reddy Vennapusa, Albert A. Shteinman, Ujjwal Mandal, Mainak Mitra, Debojyoti Mukherjee |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Catechol
Reaction mechanism 010405 organic chemistry General Chemical Engineering Substrate (chemistry) chemistry.chemical_element General Chemistry Crystal structure 010402 general chemistry 01 natural sciences Copper 0104 chemical sciences Metal chemistry.chemical_compound chemistry Catalytic cycle Tripodal ligand visual_art Polymer chemistry visual_art.visual_art_medium |
| Zdroj: | RSC Advances. 11:22951-22959 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/d1ra02787e |
| Popis: | A dinuclear copper(II) complex [Cu2(papy)2(CH3OH)2] has been synthesized by reaction of one equiv. of Cu(OAc)2·2H2O with one equiv. of the tetradentate tripodal ligand H2papy [N-(2-hydroxybenzyl)-N-(2-picolyl)glycine] and has been characterized by various spectroscopic techniques and its solid state structure has been confirmed by X-ray crystal structure analysis. The single-crystal structure of the complex reveals that the two copper centers are hexa-coordinated and bridged by two O-atoms of the phenoxo moieties. The variable temperature magnetic susceptibility measurement of the complex reveals weak ferromagnetic interactions among the Cu(II) ions with a J value of 1.1 cm−1. The catecholase activity of the complex has been investigated spectrophotometrically using 3,5-di-tert-butyl catechol as a model substrate in methanol solvent under aerobic conditions. The Michaelis–Menten kinetic treatment has been applied using different excess substrate concentrations. The parameters obtained from the catecholase activity by the complex are KM 2.97 × 10−4 M, Vmax 2 × 10−4 M s−1, and kcat 7.2 × 103 h−1. A reaction mechanism has been proposed based on experimental findings and theoretical calculations. The catechol substrate binds to dicopper(II) centers and subsequently two electrons are transferred to the metal centers from the substrate. The bridging phenoxo moieties participate as a Bronsted base by accepting protons from catechol during the catalytic cycle and thereby facilitating the catechol oxidation process. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|