caa a22 4500 465808549 CHVBK 20180323112109.0 cr unu---uuuuu 170327e19900301xx s 000 0 eng 10.1007/BF01160496 doi (NATIONALLICENCE)springer-10.1007/BF01160496 Proton phototransfer performance for 2-heteryloxazoles [Elektronische Daten] [S. Druzhinin, I. Troyanovskii, S. Krashakov, B. Uzhinov] Fluorescence spectroscopy has been applied to the photopyrolytic reactions of 2-hetaryloxazoles with acetic acid in ethanol. The reactions occur in the excited state via static and dynamic mechanisms. Various 4-substituted pyridines have similar acid-base parameters in the ground and excited states, which agrees with CNDO/S calculations. The quantum yields, equilibrium constants, and rate constants for these reactions have been determined. The performance factors in proton phototransfer for the 2-hetaryloxazoles are close to one and at least 2.4 times larger than for aza derivatives of aromatic hydrocarbons. The photoreaction and the deactivation induced by it probably involve the same reaction center: the nitrogen atom in the six-membered heterocyclic. A principle of minimum photochemical motion is proposed, in which the quantum performance in the formation of the excited products is inversely related to the change in the system wave function during the reaction. The measurements agree qualitatively with this principle. Plenum Publishing Corporation, 1990 Druzhinin S. Moscow University, USSR aut Troyanovskii I. Moscow University, USSR aut Krashakov S. Moscow University, USSR aut Uzhinov B. Moscow University, USSR aut Theoretical and Experimental Chemistry Kluwer Academic Publishers 26/2(1990-03-01), 155-160 0040-5760 26:2<155 1990 26 11237 https://doi.org/10.1007/BF01160496 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01160496 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Druzhinin S. Moscow University, USSR aut NATIONALLICENCE 700 1- Troyanovskii I. Moscow University, USSR aut NATIONALLICENCE 700 1- Krashakov S. Moscow University, USSR aut NATIONALLICENCE 700 1- Uzhinov B. Moscow University, USSR aut NATIONALLICENCE 773 0- Theoretical and Experimental Chemistry Kluwer Academic Publishers 26/2(1990-03-01), 155-160 0040-5760 26:2<155 1990 26 11237 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer