INTRAMOLECULAR ENERGY-TRANSFER IN BICHROMOPHORIC DIESTERS CONTAINING ANTHRACENE AND NAPHTHALENE GROUPS SEPARATED BY DIFFERENT NUMBERS OF METHYLENE SPACERS

Steady state fluorescence has been used to study the efficiency of non radiative singlet energy transfer from naphthalene to anthracene in na ph-COO-(CH2)m-OOC-anth for m of 2-6. A theoretical analysis has also b een performed, using the rotational isomeric state model, of the confo rmations of these molecules. The experiments clearly demonstrate the p resence of nonradiative singlet energy transfer in the bichromophoric compounds, with an efficiency that depends on the solvent and on m. Th e combination of the experiments and the theoretical analysis establis hes that the Forster radius for this system is 1,6 +/- 0,2 nm.