Abstract
The dynamics and efficiency of electronic excitation energy transfer (EET), migration and trapping are investigated in a series of novel macromolecular systems. These systems have been engineered specifically with the aim of controlling the efficiency of the energy migration though the structure of the macromolecule. Three systems are discussed. Firstly, time-resolved fluorescence measurements of poly(acenaphthylene) homopolymer, P(ACE), are compared with similar measurements on an acenaphthylene/maleic anhydride copolymer, P(ACE/MA), in which the MA groups act as spacers between the ACE chromophores. The rate of energy migration is shown to be extremely rapid in P(ACE) but restricted in the copolymer. Secondly, we illustrate the structural control now achievable through living free radical polymerization methods, which permit the design and synthesis of polymers with structures optimized for energy migration and trapping. Finally, we discuss the results of time-resolved fluorescence anisotropy measurements in the study of EET in several generations of porphyrin-based dendrimers.
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