Investigation on catecholase activity of salen Co(III) octahedral complexes. (15th November 2019)

• Record Type: Journal Article
• Authors: Mohan, Nithya; Sreejith, S.S.; Kurup, M.R. Prathapachandra
• Is Part Of: Polyhedron. Volume 173(2019)
• Publication Date: 2019-11-15
• Subjects: Catecholase -- Salen-type -- DFT study -- Co(III) octahedral -- Kinetic study; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2019.114129
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Three octahedral Co(III) Salen Schiff base complexes are synthesized and has been investigated for their catecholase activity. It has been found that the labile coordination nature and the possibility to exist as Co(III) and Co(II) helps one of the prepared complex to catalyze the oxidation reaction. Abstract: We have synthesized three octahedral Co(III) compounds in order to study their catalytic efficiency for the oxidation of 3, 5-di-tertiarybutylcatechol (3, 5-DTBC) into the corresponding quinone. Among the tested compounds, only one compound, 3 shows the catecholase activity. The catalytic efficiency of this compound arises from its capability to stabilise two different oxidation states of the metal centre. The initial oxidation state of cobalt ion (Co(III)) changes into Co(II) in order to accommodate the substrate. The kinetic parameters were calculated using the Michaelis-Menten equation. The catalytic loop was proposed and the byproduct formed in the cycle was experimentally determined.