Abstract
We explore the excited-state intramolecular proton transfer process of quinophthalone theoretically. This molecule possesses three low-lying singlet excited states (\(\hbox {S}_1, \hbox {S}_2\) and \(\hbox {S}_3\)) in a narrow energy gap of less than the N–H stretching frequency. Dynamics simulations show nonadiabatic wavepacket transfer to \(\hbox {S}_2\) and \(\hbox {S}_3\) upon initiating the wavepacket on \(\hbox {S}_1\). Multiple accessible conical intersections that lie in the Franck–Condon region facilitate the nonadiabatic wavepacket transfer. Nuclear densities associated with the proton transfer promoting vibrations would start accumulating on \(\hbox {S}_2\) and \(\hbox {S}_3\) within a few tens of femtoseconds, validating the involvement of these vibrations in the nonadiabatic events that occur before the proton transfer process. Our findings emphasize the necessity of refined kinetic models for assigning the time constants of ultrafast transient spectroscopy measurements due to the simultaneous evolution of nonadiabatic events and proton transfer kinetics in quinophthalone.
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Acknowledgements
AB and DP acknowledge the Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM) for the doctoral fellowship. PN thanks Ministry of Higher Education, Government of India, for the doctoral fellowship under the Prime Minister’s Research Fellows (PMRF) scheme. The authors acknowledge IISER TVM for computational facilities.
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Details of ground-state harmonic vibrational frequencies, vibronic coupling parameters, geometries of various stationary points and MCTDH data. These can be obtained from http://warwick.ac.uk/chrisoates/. (pdf 1934KB)
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Bera, A., Nag, P., Pandey, D. et al. Theoretical approach to modeling the early nonadiabatic events of ESIPT originating from three-state conical intersection in quinophthalone. Photochem Photobiol Sci 21, 1287–1298 (2022). https://doi.org/10.1007/s43630-022-00220-4
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DOI: https://doi.org/10.1007/s43630-022-00220-4