Vibrational and electronic spectra of protonated vanillin: exploring protonation sites and isomerisation - Université de Pau et des Pays de l'Adour Access content directly
Journal Articles Physical Chemistry Chemical Physics Year : 2024

Vibrational and electronic spectra of protonated vanillin: exploring protonation sites and isomerisation

Abstract

Photofragmentation spectra of protonated vanillin produced under electrospray ionisation (ESI) conditions have been recorded in the 3000-3700 cm−1 (vibrational) and 225-460 nm (electronic) ranges, using room temperature IRMPD (infrared multiphoton dissociation) and cryogenic UVPD (ultraviolet photodissociation) spectroscopies, respectively. The cold (∼50 K) electronic UVPD spectrum exhibits very well resolved vibrational structure for the S1 ← S0 and S3 ← S0 transitions, suggesting long excited state dynamics, similar to its simplest analogue, protonated benzaldehyde. The experimental data were combined with theoretical calculations to determine the protonation site and configurational isomer observed in the experiments
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Dates and versions

hal-04589698 , version 1 (27-05-2024)

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Alejandro Gutiérrez-Quintanilla, Baptiste Moge, Isabelle Compagnon, Jennifer A Noble. Vibrational and electronic spectra of protonated vanillin: exploring protonation sites and isomerisation. Physical Chemistry Chemical Physics, 2024, 26 (21), pp.15358-15368. ⟨10.1039/d3cp05573f⟩. ⟨hal-04589698⟩
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