Solvation dynamics of Coumarin 480 (C-480) in a tetraethyl orthosilicate (TEOS) sol−gel matrix has been studied using time-resolved emission spectroscopy. In the macroscopically solid TEOS matrix the solvation dynamics of C-480 is described by a major (85%) component of 120 ± 20 ps and a minor (15%) component of 800 ± 100 ps. These components are substantially slower than the solvation dynamics in bulk water. The rotational relaxation time of C-480 in this matrix is found to be very short (<80 ps).
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Pal et al. (2000) studied this question.
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