Rotational isomerization of small carboxylic acids isolated in argon matrices: Tunnelling and quantum yields for the photoinduced processes

Ermelinda M. S. Maçôas; Leonid Khriachtchev; Mika Pettersson; Rui Fausto; Markku Räsänen

doi:10.1039/B416641H

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Rotational isomerization of small carboxylic acids isolated in argon matrices: Tunnelling and quantum yields for the photoinduced processes

Ermelinda M. S. Maçôas,^ab Leonid Khriachtchev,*^a Mika Pettersson,†^a Rui Fausto^b and Markku Räsänen^a

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* Corresponding authors

^a Laboratory of Physical Chemistry, University of Helsinki, PO Box 55, Helsinki, Finland
E-mail: leonid.khriachtchev@helsinki.fi

^b Department of Chemistry (CQC), University of Coimbra, Coimbra, Portugal

Abstract

The quantum yields for internal rotation around the C–O bond induced by excitation of the first overtone of the hydroxyl stretching mode in formic, acetic, and propionic acids isolated in solid Ar are comparatively discussed. The tunnelling kinetics for isomerization from the higher energy arrangement of the carboxylic group (cis) to the lower energy arrangement (trans) in this series of compounds is also analysed. Finally, the quantum yield for the C_α–C isomerization in propionic acid was investigated and, in contrast with the C–O isomerization, shown to be probably sensitive to the local matrix morphology.

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DOI: https://doi.org/10.1039/B416641H
Article type: Paper
Submitted: 01 Nov 2004
Accepted: 17 Dec 2004
First published: 12 Jan 2005

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Phys. Chem. Chem. Phys., 2005,7, 743-749

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Rotational isomerization of small carboxylic acids isolated in argon matrices: Tunnelling and quantum yields for the photoinduced processes

E. M. S. Maçôas, L. Khriachtchev, M. Pettersson, R. Fausto and M. Räsänen, Phys. Chem. Chem. Phys., 2005, 7, 743 DOI: 10.1039/B416641H

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Physical Chemistry Chemical Physics

Rotational isomerization of small carboxylic acids isolated in argon matrices: Tunnelling and quantum yields for the photoinduced processes

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Rotational isomerization of small carboxylic acids isolated in argon matrices: Tunnelling and quantum yields for the photoinduced processes

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