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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 3
BKCSDE 35(3)
March 20, 2014

Title	Photophysical Model of 10-Hydroxybenzo[h]quinoline: Internal Conversion and Excited State Intramolecular Proton Transfer
Author	Junghwa Lee, Taiha Joo*
Keywords	ESIPT, Proton transfer, Internal conversion, Time-resolved fluorescence, Anisotropy
Abstract	Photophysics of 10-hydroxybenzo[h]quinoline (HBQ) has been in controversy, in particular, on the nature of the electronic states before and after the excited state intramolecular proton transfer (ESIPT), even though the dynamics and mechanism of the ESIPT have been well established. We report highly time resolved fluorescence spectra over the full emission frequency regions of the enol and keto isomers and the anisotropy in time domain to determine the accurate rates of the population decay, spectral relaxation and anisotropy decay of the keto isomer. We have shown that the ~300 fs component observed frequently in ESIPT dynamics arises from the S2→S1 internal conversion in the reaction product keto isomer and that the ESIPT occurs from the enol isomer in S1 state to the keto isomer in S2 state.
Page	881 - 885
Full Text	PDF

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