Electronic structures, bonding aspects and spectroscopic parameters of homo/hetero valent bridged dinuclear transition metal complexes.

Autor: Yadav O; Department of Chemistry, Central University of Haryana, Mahendergarh 123031, India., Ansari M; Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Pawai 400076, India., Ansari A; Department of Chemistry, Central University of Haryana, Mahendergarh 123031, India. Electronic address: ajaz.alam2@gmail.com.
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2022 Oct 05; Vol. 278, pp. 121331. Date of Electronic Publication: 2022 May 05.
DOI: 10.1016/j.saa.2022.121331
Abstrakt: Bridged dinuclear metal complexes have fascinated scientists worldwide, and remarkable success has been achieved to unravel the electronic structures, structure-function relationship, coordination environments, and fine mechanistic details of the enzymes owing to the repercussion of biomimetic studies carried out on dinuclear model systems. Molecular level study of these systems integrated with spectroscopic study helps in gaining deep insights about structural and electronic aspects of natural enzymatic systems. Considering the same, here first time we report DFT study on bridged non-heme metal complexes based on N-Et-HPTB ligand system containing homovalent (M II M II ); {[(Mn II ) 2 (O 2 CCH 3 )(N-Et-HPTB)] 2+ ; Species I), [(Fe II ) 2 (O 2 CCH 3 )(N-Et-HPTB)] 2+ ; Species II), [(Co II ) 2 (O 2 CCH 3 )(N-Et-HPTB)] 2+ ; Species III)} and heterovalent (M III M II ): {[(Mn III )(Mn II )(O 2 )(N-Et-HPTB)] 2+ ; Species Ia) [(Fe III )(Fe II )(O 2 )(N-Et-HPTB)] 2+ ; Species IIa) and [(Co III )(Co II )(O 2 )(N-Et-HPTB)] 2+ ; Species IIIa)} dinuclear metal centres. Bridging oxygen bears a significant spin density which may prompt important chemical reactions involving activation of bonds like C-H/O-H/N-H etc. TD-DFT calculations for UV-Visible absorption have been carried out to further shed light on structural-functional and electronic structures of these dinuclear species. Studying these dinuclear species may be a good starting point for the study of active sites of the bimetallic centre of dinuclear enzymes and thus may serve as fascinating spectroscopic models. Further, FMO analysis, MEP mapping, and NBO calculations were employed to analyze bonding aspects predict theoretical reactivity behaviour and any kind of stabilizing interactions present in the reported species.
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Databáze: MEDLINE
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