Abstract

Abstract The photophysical behavior of cyclophane 1 , comprised by two l -valine units and one naphthalene ring, has been studied. It displays exciplex (EX) emission with a maximum in the range 390–460 nm, depending on solvent polarity. From this dependence a dipole moment of 19.4 D for the excited charge-transfer state has been calculated. Fluorescence quantum yields in organic media ranging from 0.012 to 0.038 have been measured. This phenomenon has been interpreted taking into account the rigidity imposed by the cyclophane framework which could pre-orient the donor and the acceptor subunits for a favorable interaction.

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