It has been performed the theoretical studying the electron structure and relaxation processes in resazurin with using the quantum-chemical calculation methods (MNDO/d and AM1). It is shown that that the quantum transition So - S (<$E sigma sigma *>) is characterized by rather intense absorption band in contrast to the quantum transitions in S (<$E pi sigma *>) or S (<$E sigma pi *>) state, which corresponds to the oscillator strength close to 0. Dissociation of the C - O bond in the highly excited molecule of the resazurin occurs with high efficiency (no potential barrier in the triplet state). Calculations show that the absorption band that corresponds So - S (<$E sigma sigma *>) quantum transition is in the range from 292 to 317 nm, which is consistent with experimental data on the photochemical activity.

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