Effect of the electronic structure of heteroaromatic compounds on their phototransformations in polar media

Autor:	M. N. Usacheva, V. V. Osipov, I. I. Dilung, I. V. Drozdenko
Rok vydání:	1991
Předmět:	Steric effects chemistry.chemical_compound Anthracene Quenching (fluorescence) chemistry Computational chemistry Acridine Phenazine Photodissociation General Chemistry Electronic structure Excimer Photochemistry
Zdroj:	Theoretical and Experimental Chemistry. 26:424-430
ISSN:	1573-935X 0040-5760
Popis:	The effect of the electronic structure of aromatic (anthracene) and heteroaromatic (phenazine, acridine, 9-methyl-1,2-benzacridine) compounds on the mechanism of the formation of exciplexes with N,N′-dimethylaniline and their further transformations in media with various polarities was investigated by the quenching of the fluorescence of the exciplex. It was shown that for heteroaromatic compounds characterized by a substantial contribution from the nπ* electronic configuration to the lowest excited singlet state, in contrast to aromatic compounds, the exciplex is formed in two stages, i.e., nonequilibrium Franck-Condon and equilibrium stages. The photodissociation processes for these systems in polar media also take place from a non-equilibrium state. The important role of the steric configuration of the components of the exciplex in its relaxation process was also noticed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::44d2c17e944aca4853516b2d84f1cd41 https://doi.org/10.1007/bf00530256 Zobrazit plný text záznamu Full text from SpringerLink