Abstract
Publisher Summary This chapter discusses photophysical processes in multichromophoric systems at the ensemble and single molecule level. Photophysical processes play a key role in the excited state dynamics of biological multichromophoric systems, such as light harvesting complexes and autofluorescent proteins. As a model system to study these photophysical pathways in multichromophoric entities, specially designed rigid dendrimers with a well defined number of chromophores are synthesized. Using the combination of ensemble and single molecule fluorescence techniques, a better picture of the excited state processes, such as energy hopping, singlet-singlet annihilation, singlet-triplet annihilation, and anion quenching can be established. Stationary absorption and fluorescence measurements in toluene are performed at room temperature. The fluorescence decay times for all the dendrimers are measured in toluene by the single photon counting method, detecting the emission under magic angle condition. The dendrimers are excited at 488 nm and detection is made at 600 nm. Besides time resolved measurements under magic angle condition, time resolved anisotropy measurements are also carried out.
Published Version
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