Effect of alkylamino group fixation on the spectral-luminescence properties of coumarines and their ability to participate in intermolecular interactions

The spectral-luminescence properties of substituted 7-alkylaminocoumarines with nonfixed and fixed amino groups and AC3F are studied theoretically and experimentally. The calculation is carried out by the method of partial neglect of differential overlapping. It is shown that fixation of alkylamino groups in coumarines increases the quantum yield of fluorescence in polar solutions with virtually no effect on the position of the absorption and fluorescence spectra. Data from molecular electrostatic potential calculations show that the coumarines with a fixed aikylamino group have a high probability for participating in intermolecular interactions in the proton acceptor centers.The material in this paper was presented at the All-Union Conference on Organic Luminophores and Their Application in the Economy, Khar'kov (1984).Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 79–84, November, 1986.