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Density functional theory study on the mechanism of the reductive cleavage of CO2 by a bis-â-diketoiminatediiron dinitrogen complex

journal contribution
posted on 2023-05-17, 05:00 authored by Alireza AriafardAlireza Ariafard, Brookes, NJ, Stranger, R, Boyd, PDW, Brian YatesBrian Yates
Density functional theory has been used to analyze the detailed reaction mechanism for the reductive cleavage of CO2 by a dinitrogen bridged bis-β-diketoiminatediiron complex, LtBuFe-N2-FeL tBu (I), recently reported by Holland and co-workers. A number of pathways have been investigated and the most likely mechanism correlates well with experimental evidence. A rationale has been provided for the binding of CO2, the release of CO, and the ready formation of CO 3 2-. Our results show that the insertion of CO2 into the diiron complex is the rate determining step of the reductive cleavage reaction. An intramolecular reduction step from the reduced dinitrogen bridge is proposed which serves to increase the activation of CO2. This is followed by an intersystem crossing from the septet to the nonet state which acts as a driving force for the subsequent release of CO. The overall reductive cleavage reaction is exergonic by 120 kJ/mol, and further reaction of the released CO with the starting diiron complex is also predicted to be strongly exergonic. © 2010 American Chemical Society.

Funding

Australian Research Council

History

Publication title

Inorganic Chemistry

Volume

49

Issue

17

Pagination

7773-7782

ISSN

0020-1669

Department/School

School of Natural Sciences

Publisher

American Chemical Society

Place of publication

Washington

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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