Direct Valence Isomerization of Newly Synthesized Norbornadiene Aromatic Derivatives. A Kinetic and Photophysical Study
Four norbornadiene aromatic derivatives, potentially useful for light energy photochemical storage, were synthesized. Their photophysical properties and the kinetics of the valence photoisomerization reaction into quadricyclanes were investigated. Overall first-order rate constants of photoisomerization were found to be very fast and to vary markedly with the polarity of the solvent.