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Accueil du site > Production scientifique > Elusive Sulfurous Acid : Gas-Phase Basicity and IR Signature of the Protonated Species

Elusive Sulfurous Acid : Gas-Phase Basicity and IR Signature of the Protonated Species

Date de publication: 10 avril 2015

R.K. Sinha, D. Scuderi, P. Maître, B. Chiavarino, M.E. Crestoni, S. Fornarini
J. Phys. Chem. Lett. 6 1605-1610 (2015). DOI

Travail réalisé sur le site de l’Université Paris Sud.

Abstract

The ion corresponding to protonated sulfurous acid, H3SO3+, has been successfully delivered into the gas phase by electrospray ionization of the solution of a suitable precursor and an in-source fragmentation process. The neutral acid is a highly elusive molecule. However, its gas-phase basicity has been ascertained by means of a kinetic study of proton-transfer reactivity. The structure of the H3SO3+ sampled ion has been probed by IRMPD spectroscopy in two complementary IR frequency ranges in conjunction with density functional theory calculations and found to conform to a trihydroxosulfonium ion. The characteristic IR signatures may aid in deciphering the presence of this species in extraterrestrial atmospheres.