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Effect of local environment on motion of molecular aggregates:

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Effect of local environment on motion of molecular aggregates:

In recent years, excitonic energy transfer and dynamics within molecular aggregates have gained high interest as they mimic pigment assemblies within photosynthetic complexes. In molecular aggregates, excitonic interaction results from electronic coupling between monomers which depends on the arrangement of transition dipole moments leading to formation of J- and H-aggregates.

 

How one can control the rate of energy transfer within these aggregates by controlling external parameters, like, pH or viscosity of the medium?