Abstract

In the present work the analysis of the possible ways of energy degradation of electron excited states of 4-methyl-7-hydxycoumarin and its protolytic forms is presented; a ratio of radiative and nonradiative channels of deactivation of energy of electronic excitation is established; constants of photophysical processes (internal and intercrossing conversion), proceeding after act of absorption of light are designed. The radiating channel of decay of state S₁* in anion is dominant, while in the neutral form probability of a crossing of a molecule in triplet states is great, the intercrossing constant between the first singlet and fifth triplet states is 10⁹ s^-1 .