Study of energy transfer from 7-amino coumarin donors to rhodamine 6G acceptor in non-aqueous reverse micelles

The energy transfer using 7-amino coumarin dyes as donor and rhodamine 590 (Rh6G) as acceptor were investigated in methanol and acetonitrile solubilized non-aqueous reverse micelles using steady state and time resolved fluorescence spectroscopy. For all donors and acceptor we have obtained higher value of overlap integral (J(λ)) and higher value of Förster distance (R0). Although we have got higher value of J(λ) but the rate constant of energy transfer (kET) in almost all systems are small. Coumarin153-Rh6G pair is the most efficient donor acceptor pair as reflected by the value of kET. The different value of energy transfer rate constant in case of different donors indicate the dependence of energy transfer on the structure of donors.