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Valiev, R. R; Nasibullin, R. T; Cherepanov, V. N; Kurtsevich, A; Sundholm, D; Kurtén, T
Physical chemistry chemical physics : PCCP, 03/2021, Volume: 23, Issue: 11Journal Article
An efficient method for estimating non-adiabatic coupling matrix elements (NACME) and rate constants for internal conversion ( k IC ) is presented. The method, based on Plotnikov's theory, requires only calculations of the electronic wave functions and the corresponding electronic excitation energies. Computationally expensive calculations of the derivatives of the electronic wave function with respect to the nuclear coordinates are avoided. When the main accepting modes of the electronic excitation energy are X - H vibrations, the present method can be used for estimating the efficiency of the energy transfer between donor and acceptor molecules. It can also be used in studies of the influence of hydrogen bonding or solvent effect on fluorescence quenching, in studies of vibronic effects of TADF (thermally activated delayed fluorescence) emitters, and for calculating k IC . Here, k IC and NACME are calculated for free-base porhyrin, magnesium porphyrin, azulene, naphthalene, pyrene and fluorenone interacting with a solvent molecule. Reverse k IC and NACME are further calculated for the T 1 → T 2 transition of dibenzothiophene- S , S -dioxide (PTZ-DBTO2), which is used in TADF applications. Finally, we estimate the efficiency of the energy transfer between two large porphyrinoid dimers. An efficient method for estimating non-adiabatic coupling matrix elements (NACME) and rate constants for internal conversion ( k IC ) is presented.
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