Issue 18, 2023

An investigation into the Brønsted acidity of the perfluorinated alkoxy silanes {(F3C)3CO}3SiH and {(F6C5)3CO}2Si(Cl)H

Abstract

The perfluorinated alkoxy silanes {(F3C)3CO}3SiH (1) and {(F5C6)3CO}2Si(Cl)H (2) were prepared and fully characterized. Despite the high calculated Brønsted acidities, all attempts to deprotonate 1 and 2 to give the conjugate silanide ions failed due to the exceptionally short and strong Si–H bonds. In the solid state, the Si–H units are not involved in any intermolecular interactions, but instead the crystal packing consists of exceptionally short and strong F⋯F interactions. The cohesive energies are entirely comprised of London dispersion interactions, similarly as in the crystal structures of noble gases.

Graphical abstract: An investigation into the Brønsted acidity of the perfluorinated alkoxy silanes {(F3C)3CO}3SiH and {(F6C5)3CO}2Si(Cl)H

Supplementary files

Article information

Article type
Paper
Submitted
31 1 2023
Accepted
11 4 2023
First published
11 4 2023

Dalton Trans., 2023,52, 5918-5925

An investigation into the Brønsted acidity of the perfluorinated alkoxy silanes {(F3C)3CO}3SiH and {(F6C5)3CO}2Si(Cl)H

F. Feige, L. A. Malaspina, F. Kleemiss, J. F. Kögel, S. Ketkov, E. Hupf, S. Grabowsky and J. Beckmann, Dalton Trans., 2023, 52, 5918 DOI: 10.1039/D3DT00299C

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