Spectral and photochemical properties of bifunctional compounds and their complexes
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Quantum yields of the step-by-step photocyclization of diphenylamine (DPA) derivatives Ph2N−(CH2)n−NPh2,n=3–6, 9, to the corresponding α,ω-di(carbazolyl)alkanes were measured. Atn>3, the presence of the second DPA group had no effect on the cyclization of the first DPA group; however, cyclization of the second DPA group was retarded after cyclization of the first DPA group. The effect was explained by quenching of the excited DPA group by the carbazole group newly formed in the semi-cyclic compound. For disubstituted propane (n=3), the mutual influence of the two groups at both stages of the reaction was found.
Key wordsbifunctional compounds diphenylamine photocyclization carbazole energy transfer
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