Use of microwave dielectric spectroscopy for the In Actu assessment of frustrated Lewis Pair encounter complexes

Yu, Cihang, Leitch, Jamie A., Gierlichs, Lukas, Das, Sampurna, Porch, Adrian ORCID: https://orcid.org/0000-0001-5293-8883, Melen, Rebecca L. ORCID: https://orcid.org/0000-0003-3142-2831 and Browne, Duncan L. ORCID: https://orcid.org/0000-0002-8604-229X 2024. Use of microwave dielectric spectroscopy for the In Actu assessment of frustrated Lewis Pair encounter complexes. Journal of the American Chemical Society 146 (29) , 19809–19817. 10.1021/jacs.4c02736

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Abstract

Frustrated Lewis pairs (FLPs) offer an important and promising paradigm for main group catalysis. Reported here is the use of microwave dielectric spectroscopy for the in actu detection of FLP encounter complexes. This technique focuses on the room-temperature measurement of the loss component of microwave permittivity (ε2) over the bandwidth from 0.5 to 6.8 GHz. The microwave loss measured for a Lewis pair in a toluene host solution is compared with the losses of the individual components when measured separately, and the difference in loss Δε2 is used to characterize the electrostatic interaction between the pair. The Δε2 value shows a direct correlation with an ability for the FLP encounter complex to split hydrogen gas and abstract hydrogen from γ-terpinene and has led to the identification of a novel FLP encounter complex, tris-pentafluorophenyl borane-eucalyptol pairing.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Engineering Cardiff Catalysis Institute (CCI)
Publisher:	American Chemical Society
ISSN:	0002-7863
Funders:	EPSRC and Leverhulme Trust
Date of First Compliant Deposit:	24 July 2024
Date of Acceptance:	20 June 2024
Last Modified:	25 Jul 2024 13:30
URI:	https://orca.cardiff.ac.uk/id/eprint/170900

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