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Chapter 2 Single molecule spectroscopy of multichromophoric dendrimers at room and liquid helium temperatures

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Publisher Summary This chapter discusses the single molecule spectroscopy of multichromophoric dendrimers at room and liquid helium temperatures. Single molecule spectroscopy has become an important tool for the optical study of the electronic interactions of proximate chromophores as the electronic interactions can be studied without averaging over the properties of an intrinsically heterogeneous ensemble. Single perylenemonoimide (PMI) chromophores are selectively addressed in the frequency domain within spatially isolated multichromophoric dendrimers, which are dispersed in a polymer film. Although the chromophores are interacting, they still can be addressed separately. This feature in connection with the high spectral resolution at low temperatures opens up a number of promising perspectives for the study of proximate and interacting molecules. By combining confocal microscopy and high-resolution laser spectroscopy at low temperatures, single chromophores have been spectrally isolated within two chemically distinct multichromophoric dendrimers dispersed and spatially isolated in a polymer film. It is shown that unidirectional Forster type energy transfer among the chromophores leads to emission from the chromophoric site, which is lowest in transition energy.