Recovery of the distribution of interchromophoric distances in a donor-acceptor coumarin supermolecule by time-resolved energy-transfer measurements
✍ Scribed by M. Kaschke; B. Valeur; J. Bourson; N.P. Ernsting
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 581 KB
- Volume
- 179
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
By excitation and probe spectroscopy, we have measured the intramolecular electronic energy transfer in a bichromophoric coumarin. Here, the linkage between the two constituent chromophores consists of a highly flexible chain containing C-C and C-O bonds. The energy transfer proceeds on a time scale of several picoseconds. The experimental results of the kinetic measurements can be well described by a dipole-dipole interaction model which takes into account a Gaussian distribution of intramolecular distances between the two chromophores. Average intramolecular chromophore separations, as well as estimates for the width of the distribution, can be derived from the experiment.