Projets par an
Résumé
Salicylideneanilines are characterized by a tautomer equilibrium, between an enol and a keto form of different colors, at the origin of their remarkable thermochromic, solvatochromic, and photochromic properties. The enol form is usually the most stable but appropriate choice of substituents and conditions (solvent, crystal, host compound) can displace the equilibrium toward the keto form so that there is a need for fast prediction of the keto:enol abundance ratio. Here we demonstrate the reliability of a combined theoretical−experimental method, based on comparing simulated and measured UV/visible absorption spectra, to determine this keto/enol ratio. The calculations of the excitation energies, oscillator strengths, and vibronic structures of both enol and keto forms are performed for all excited states absorbing in the relevant (visible and near-UV) wavelength range at the time-dependent density functional theory level by accounting for solvent effects using the polarizable continuum model. This approach is illustrated for two salicylideneaniline derivatives, which are present, in solution, under the form of keto−enol mixtures. The results are compared to those of chemometric analysis as well as ab initio predictions of the reaction free enthalpies.
langue originale | Anglais |
---|---|
Pages (de - à) | 5370-5374 |
Nombre de pages | 5 |
journal | Journal of physical chemistry A |
Volume | 122 |
Numéro de publication | 24 |
Les DOIs | |
Etat de la publication | Publié - 21 juin 2018 |
Empreinte digitale
Examiner les sujets de recherche de « Predicting Keto–Enol Equilibrium from Combining UV/Visible Absorption Spectroscopy with Quantum Chemical Calculations of Vibronic Structures for Many Excited States: A Case Study on Salicylideneanilines ». Ensemble, ils forment une empreinte digitale unique.Projets
- 2 Terminé
-
CÉCI – Consortium des Équipements de Calcul Intensif
Champagne, B., Lazzaroni, R., Geuzaine , C., Chatelain, P. & Knaepen, B.
1/01/18 → 31/12/22
Projet: Recherche
-
Elaboration de méthodes de chimie quantique pour prédire et interpreter les spectres vibrationnels de molécules à l’état excité
LOUANT, O., Champagne, B. & Liegeois, V.
1/10/14 → 30/09/18
Projet: Projet de thèse
Équipement
-
Plateforme Technologique Calcul Intensif
Benoît Champagne (!!Manager)
Plateforme technologique Calcul intensifEquipement/installations: Plateforme technolgique