Femtosecond dynamics of intramolecular photoinduced proton transfer in N-substituted 2-(2-aminophenyl)-4H-3,1-benzoxazin-4-ones View Full Text


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Article Info

DATE

2010-11-14

AUTHORS

M. N. Khimich, F. E. Gostev, I. V. Shelaev, O. M. Sarkisov, E. A. Birgen, B. M. Bolotin, B. M. Uzhinov

ABSTRACT

Femtosecond dynamics of processes in the excited state of 2-(2-aminophenyl)-4H-3,1-benzoxazin-4-ones has been studied by femtosecond absorption spectroscopy. The rate constants of intramolecular photoinduced proton transfer (IPPT) have been determined for the N-substituted derivatives (0.7–11 ps−1). The IPPT rate constant depends on the inductive constant of the substituent and the potential barrier height, which was calculated by a quantum-chemical method (TDDFT). The multiexponential character of the kinetics of photoinduced absorption by the compounds with a low inductive constant of the N-substituent in the spectral region of the S1 → SN absorption and the stimulated emission of the IPPT product is explained by the rapid (∼10 ps−1) relaxation process preceding the IPPT. More... »

PAGES

482-491

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0018143910060056

DOI

http://dx.doi.org/10.1134/s0018143910060056

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1038378577


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