Abstract
Rate constants for fluorescence, non-radiative decay and trans—cis photoisomerization of 4,4′-diaminostilbene-2,2′-disulphonic acid (DASDA) have been determined in a range of solvents. The results indicate a marked dependence of the non-radiative rates on solvent polarity, which is discussed in terms of the importance of amino-group lone-pair electron delocalization and intramolecular charge transfer to the photochemistry of DASDA. A comparison is made with the photophysics and photochemical behaviour of the unsulphonated compound.
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