Kim Jinyong, Heo Wooseok, Joo Taiha
Department of Chemistry, Pohang University of Science and Technology (POSTECH) , Pohang, 790-784, South Korea.
J Phys Chem B. 2015 Feb 12;119(6):2620-7. doi: 10.1021/jp5088306. Epub 2014 Dec 18.
Excited state intramolecular proton transfer (ESIPT) of 1-hydroxy-2-acetonaphthone (HAN) has been in controversy, mainly because its Stokes shift is small compared to those of typical ESIPT molecules. We have investigated excited state dynamics of HAN by time-resolved fluorescence with a resolution high enough to record the nuclear wave packet motions in the excited state. Population dynamics of both the normal and tautomer forms were recorded together with the wave packet motions of the tautomer in the excited state, which confirm the ESIPT of HAN. The population dynamics of the normal and tautomer forms imply that the ESIPT dynamics is biphasic with two time constants <25 and 80 fs. Theoretical analysis of the vibrational modes of the tautomer excited impulsively reveals that major part of the change for the ESIPT reaction is on the naphthalene ring.
1-羟基-2-乙酰萘（HAN）的激发态分子内质子转移（ESIPT）一直存在争议，主要是因为与典型的ESIPT分子相比，其斯托克斯位移较小。我们通过时间分辨荧光研究了HAN的激发态动力学，分辨率足够高，能够记录激发态中的核波包运动。正常形式和互变异构体形式的布居动力学与激发态中互变异构体的波包运动一起被记录下来，这证实了HAN的ESIPT。正常形式和互变异构体形式的布居动力学表明，ESIPT动力学是双相的，具有两个时间常数<25和80飞秒。对互变异构体激发态振动模式的理论分析表明，ESIPT反应变化的主要部分发生在萘环上。
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