Grynyov R. Exciton transport in J-aggregates with controlled disorder degree.

The objects are amphi-PIC J-aggregates and dyes Sq-2Me, DiD. The aim of the work is to determine the efficiency and mechanisms of exciton migration in amphi-PIC J-aggregates, which are a model system of light-harvesting complexes of the photosynthetic system of plants. For this purpose, to clarify the features of optical spectra of amphi-PIC J-aggregates with controlled statical disorder degree and energy transfer to the exciton traps. Results, novelty: a model system of light-harvesting complexes (J-aggregates of amphi-PIC dye with two types of exciton traps) for studying the exciton transport has been created. The traps, which are dye molecules with electron-acceptor properties, are found to be an additional reason for quenching amphi-PIC J-aggregates luminescence; it has been shown that in amphi-PIC J-aggregates electronic excitations can migrate over sub-micron distance; for the first time it has been shown that the efficiency of exciton transport in J-aggregates can be controlled by changing the degree of statical disorder; it has been found that even in the case of high statical disorder, at the excitation in the absorption band maximum, the exciton transport in amphi-PIC J-aggregates is of coherent nature. This feature is observed up to room temperatures. The fields of implementation are excitonic physics, purposeful development of nanoclusters with controlled optical properties; creation of novel luminescennt probes for molecular biology and exploration of photoprocesses in biological objects.