Photophysical and fluorescence quenching properties of PEROPYRENE (cas 188-96-5) in solution

Add time:09/29/2019    Source:infona.pl

The photophysical properties of PEROPYRENE (cas 188-96-5) in toluene and acetonitrile solutions at room temperature were investigated with stationary and time-resolved fluorescence and absorption measurements. Peropyrene is highly fluorescent (Φ F = 0.93 in toluene) and exhibits several absorption and fluorescence spectroscopic features similar to those of perylene. The absorption spectra of the triplet molecules ( 3 PP * ) and the radical anions ( 2 PP - ) and cations ( 2 PP + ) in acetonitrile were recorded. Photoinduced electron transfer reactions between singlet excited peropyrene ( 1 PP * ) and organic electron acceptors were investigated in acetonitrile. The reaction between 1 PP * and 1,3-dinitrobenzene (DNB) was studied in more detail. The time-resolved detection of 3 PP * and 2 PP + as primary products in the fluorescence quenching process allowed the elucidation of the deactivation of the solvent-separated radical ion pair (SSRIP) 1 ( 2 PP + ... 2 DNB - ). The rate constants for the spin-allowed and the spin-forbidden charge recombination (CR) reactions were determined to be k C R G = (4 +/- 2) x 10 1 0 s - 1 and k C R T = (6+/-3) x 10 8 s - 1 . Together with the results from our previous studies of intermolecular electron transfer reactions involving perylene and perylene dyes, these rate constants and their dependences on the corresponding free energy changes are discussed within the framework of non-adiabatic electron transfer theory.

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