A bis-pyrazolate Pincer on Reduced Cr Deoxygenates CO2: Selective Capture of the Derived Oxide by Cr(II).

08:00 EDT 9th April 2019 | BioPortfolio

Summary of "A bis-pyrazolate Pincer on Reduced Cr Deoxygenates CO2: Selective Capture of the Derived Oxide by Cr(II)."

Reduction of the bis-(pyrazolyl)pyridine complex [LCr]2 with stoichiometric KC8 in THF produces a species that is reactive with CO2 to produce an aggregate composed of paramagnetic K2L2Cr2(CO3) linked by KCl into a product of formula [K2L2Cr2(CO3)]4∙2KCl. X-ray diffraction reveals a pincer hydrocarbon exterior and an inorganic interior composed of K+, Cl- and carbonate oxygens. Every Cr is five coordinate and square pyramidal, with the axial N donor weakly bonded to Cr due to the Jahn-Teller effect of a high spin d4 configuration. Reaction with 13CO2 confirms that carbonate here is derived from CO2, that oxide is derived from CO2, and that CO is indeed released, since it is not a competent ligand to Cr(II). Guiding principles for selectivity in CO2 reduction are deduced from the diverse successful molecular constructs to date.


Journal Details

This article was published in the following journal.

Name: Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765


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