Dual fluorescence of 1-nitro, 4″-amino, p-terphenyl: origin and selective quenching

Add time:07/28/2019    Source:sciencedirect.com

Compared with those of p-terphenyl, the absorption and fluorescence spectra of its 1-nitro, 4″-amino derivative in dioxane exhibit additional long-wave bands. These are assigned to transitions involving a series of excited configurations, of increased electron delocalization and lower energy, produced by a successive conformational relaxation of the non-planar Franck—Condon product of absorption in the short-wave band. Assignment of the long-wave fluorescence component origin to the completely delocalized (CD) state, which undergoes reversible relaxation to a non-emissive TICT state, is consistent with both its thermal enhancement and biexponential response. Selective quenching of short- and long-wave fluorescence by CCl4 and by polar additives respectively requires that the emitting states are not coupled to each other.

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