Ultrafast measurements of charge and excited-state intramolecular proton transfer in solutions of 4\’ – (N,N-dimethylamino) derivatives of 3-hydroxyflavone

Year: 2004

Authors: Ameer-Beg S., Ormson S.M., Poteau X., Brown R.G., Foggi P., Bussotti L., Neuwahl F.V.R.

Autors Affiliation: Centre for Photochemistry, University of Central Lancashire, Preston, Lancashire PR1 2HE, United Kingdom; LENS, Largi E. Fermi 2, Florence, Italy; School of Applied Sciences, University of Glamorgan, Rhondda Cynon Taff, CF37 1DL, United Kingdom

Abstract: Transient spectra for 4\’-(N,N-dimethylamino)-3-hydroxy- (1a) and 4\’-(N,N-dimethylamino)-3-methoxyfIavone (2a) in several solvents at room temperature are reported following excitation with pulses of approximately 100 fs fwhm. la exhibits emission from both the normal excited state and from the excited tautomer produced following excited-state intramolecular proton transfer (ESIPT). Rate constants for the ESIPT process are found to vary between 3.3 × 10 11 and 3 × 10 10 s -1 depending on the solvent. Polar solvents are found to play a significant role in stabilizing the normal excited state of both la and 2a.

Journal/Review: JOURNAL OF PHYSICAL CHEMISTRY A

Volume: 108 (34)      Pages from: 6938  to: 6943

KeyWords: Diode arrays; Intermolecular proton transfer; Metal ionbinding ability; Photophysics; Solvent tuning, Absorption; Absorption spectroscopy; Acetonitrile; Charge transfer; Derivatives; Ethanol; Organic solvents; Oscillations; Protons; Purification; Rate constants; Synthesis (chemical), Aromatic compounds
DOI: 10.1021/jp048512d

ImpactFactor: 2.639
Citations: 58
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