Add time:09/08/2019         Source:sciencedirect.com

The interaction of 3-carboxy-5,6-benzocoumarin (BzCum) with 1,2,3,4,5,6,7,8-octahydroacridine (OHA), 9-amino-1,2,3,4,5,6,7,8-octahydroacridine (H2N-OHA) and the corresponding N-oxides (OHA-NO and H2N-OHA-NO) was studied by fluorescence (steady state, time resolved) and absorption spectroscopy. The analysis of the fluorescence data in terms of Stern–Volmer plots indicated a predominant dynamic quenching for OHA and OHA-NO, and a more complex process for H2N-OHA and H2N-OHA-NO. The dynamic process was assigned to a photoinduced electron transfer (PET) from the acridine derivatives to the excited state of BzCum. The application of the Rehm–Weller–Marcus theory leads to a good agreement with literature data and allows for the estimation of the solvent organization energy. The presence of the PET mechanism was also supported by DFT results. The absorption spectra evidence the formation of a ground state complex assigned to a hydrogen bond complex involving the carboxylic hydrogen of BzCum.

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