2026-04-19T19:14:26Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/909172025-07-17T08:13:35Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Lopes Jesus, A. J. author Reva, I. author Araujo-Andrade, Cuauhtemoc author Fausto, R. author 2016-03-25 Conformational changes induced thermally or upon infrared excitation of matrix-isolated 6-methoxyindole were investigated. Narrowband near-infrared excitation of the first overtone of the N–H stretching vibration of each one of the two identified conformers is found to induce a selective large-scale conversion of the pumped conformer into the other one. This easily controllable bidirectional process consists in the intramolecular reorientation of the methoxy group and allowed a full assignment of the infrared spectra of the two conformers. Matrices with different conformational compositions prepared by narrow-band irradiations were subsequently used to investigate the effects of both thermal and broadband infrared excitations on the conformational mixtures. Particular attention is given to the influence of the matrix medium (Ar vs. Xe) and conformational effects of exposition of the sample to the spectrometer light source during the measurements. Peer Reviewed Postprint (author's final draft) Àrees temàtiques de la UPC::Física Optics infrared light Òptica Conformational changes in matrix-isolated 6-methoxyindole: Effects of the thermal and infrared light excitations