Russian Journal of Biological Physics and Chemisrty Russian Journal of Biological Physics and Chemisrty АКТУАЛЬНЫЕ ВОПРОСЫ БИОЛОГИЧЕСКОЙ ФИЗИКИ И ХИМИИ 2499-9962 55112 10.29039/rusjbpc.2022.0534 Моделирование в биофизике Modelling in biophycis Моделирование в биофизике TD-DFT STUDY OF TOLUIDINE BLUE O IN AQUEOUS SOLUTION: VIBRONIC TRANSITIONS AND ELECTRONIC PROPERTIES TD-DFT STUDY OF TOLUIDINE BLUE O IN AQUEOUS SOLUTION: VIBRONIC TRANSITIONS AND ELECTRONIC PROPERTIES Костюков В. В. Kostjukov V. V. Viktor_Kostukov@mail.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Леонтьева С. В. Leontieva S. V. tezidi@gmail.com Савченко Е. В. Savchenko E. V. Рыбакова К. А. Rybakova K. A. Воронин Д. П. Voronin D. P. Севастопольский государственный университет Севастополь Россия Sevastopol State University Sevastopol Russian Federation Черноморское высшее военно-морское ордена Красной Звезды училище имени П.С. Нахимова Севастополь Россия Black Sea Higher Naval Orders of the Red Star School named after P.S. Nakhimov Sevastopol Russian Federation Севастопольский государственный университет Севастополь Россия Sevastopol State University Sevastopol Russian Federation Севастопольский государственный университет Севастополь Россия Sevastopol State University Sevastopol Russian Federation Севастопольский государственный университет Севастополь Россия Sevastopol State University Sevastopol Russian Federation Севастопольский государственный университет Севастополь Россия Sevastopol State University Sevastopol Russian Federation 28 09 2022 28 09 2022 7 3 399 407 20 09 2022 20 09 2022 https://rusjbpc.ru/en/nauka/article/55112/view

The vibronic absorption spectrum of Toluidine blue O (TBO) dye in an aqueous solution was calculated using the time-dependent density functional theory (TD-DFT). The calculations were performed using all hybrid functionals supported by Gaussian16 software and 6-31++G(d,p) basis set with IEFPCM and SMD solvent models. The IEFPCM gave underestimated values of λmax in comparison with the experiment, what is a manifestation of the TD-DFT "cyanine failure". However, the SMD made it possible to obtain good agreement between calculated and experimental spectra. The best fit was achieved using the X3LYP functional. The dipole moments and atomic charges of the ground and excited states of the TBO molecule were calculated. Photoexcitation leads to an increase in the dipole moment of the dye molecule. An insignificant photoinduced electron transfer was found in the central ring of the chromophore of the TBO molecule. Vibronic transitions play a significant role in the absorption spectrum of the dye.

The vibronic absorption spectrum of Toluidine blue O (TBO) dye in an aqueous solution was calculated using the time-dependent density functional theory (TD-DFT). The calculations were performed using all hybrid functionals supported by Gaussian16 software and 6-31++G(d,p) basis set with IEFPCM and SMD solvent models. The IEFPCM gave underestimated values of λmax in comparison with the experiment, what is a manifestation of the TD-DFT "cyanine failure". However, the SMD made it possible to obtain good agreement between calculated and experimental spectra. The best fit was achieved using the X3LYP functional. The dipole moments and atomic charges of the ground and excited states of the TBO molecule were calculated. Photoexcitation leads to an increase in the dipole moment of the dye molecule. An insignificant photoinduced electron transfer was found in the central ring of the chromophore of the TBO molecule. Vibronic transitions play a significant role in the absorption spectrum of the dye.

 Toluidine blue O aqueous solution vibronic absorption spectrum time-dependent density functional theory electronic properties Toluidine blue O aqueous solution vibronic absorption spectrum time-dependent density functional theory electronic properties

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