Ultrafast Phenomena IV pp 374-376 | Cite as
Structural and Solvent Effects on the Excited State Dynamics of 3-Hydroxyflavones
Abstract
Much less is known about small barrier (<5 kcal/mol) proton transfer reactions than the widely studied large barrier case. Fortunately, laser studies on molecules undergoing excited state intramolecular proton transfer ESIPT offer the means to investigate the kinetics and mechanism of ultrafast small barrier proton transfer. One of the most interesting molecules which exhibits ESIPT is 3-hydroxyflavone 3HF. Several groups have been studying this molecule in recent years [1-5]. It is now clear that the stable ground-state isomer of 3HF is the normal N form. Electronically excited N molecules (\(\lambda \frac{{\max }}{{fJ}} = 410nm\)) undergo a rapid proton transfer isomerization to yield a tautbmer L form (\(\left( {{{\lambda }_{{fl}}} = 543nm} \right)\)${\lambda _{fJ}} = 543nm$). The proton transfer kinetics (N→T) has a fast and slow coripbonent [1–2] and the kinetics are strongly dependent on solvent and temperature [1–5].
Keywords
Proton Transfer Proton Transfer Reaction Excited State Intramolecular Proton Transfer Intramolecular Proton Transfer Tight ComplexPreview
Unable to display preview. Download preview PDF.
References
- 1.A.J.G. Strandjord and P. F. Barbara, Chem. Phys. Lett., 98 21 (1983).ADSCrossRefGoogle Scholar
- 2.A.J.G. Strandjord, S. H. Courtney, D. M. Friedrich, and P. F. Barbara, J. Phys. Chem., 87, 1125 (1983).CrossRefGoogle Scholar
- 3.D. McMorrow and M. Kasha, J. Phys. Chem., 88, 2235 (1984).CrossRefGoogle Scholar
- 4.G.J. Woolfe and P. J. Thistlethwaite, J. Amer. Chem. Soc., 103, 6919 (1981).Google Scholar
- 5.M. Itoh, K. Tokumura, Y. Tanimoto, Y. Okada, H. Takeuchi, K. Obi, and I. Tanaka, ibid, 104 4146 (1982).Google Scholar