Triplet exciplexes of nitrofuran derivatives with aromatic amines

1.	The energy of the triplet electronically excited state in 5-(4-R-1-quinolyl)-2-nitrofurans and 5-nitropyromucic acid is localized chiefly on the chain of -electron conjugation of the molecules.
2.	With an increase in the length of the chain of -electron conjugation in nitrofuran derivatives their reduction potential in the triplet electronically excited state decreases; this, in turn, decreases the rate constant for interaction of the triplet state with electron donors — amines.
3.	As a result of interation of the triplet states of the investigated nitrofuran derivatives with tertiary aromatic amines in dioxane one observes the formation of triplet exciplexes, the principal contribution to the structure of which is made by a state with complete charge transfer, whereas their deactivation is realized via reverse charge transfer as a result of decomposition of the nitrofuran anion radical.

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1510–1514, July, 1988.