Cyano-bis(biphenyl)ethene derivative, which exhibits aggregate-induced enhanced emission character was fixed to [2,2]-paracyclophane and its fluorescence behavior was compared to the corresponding isolated monomer in a solution state. Synthesis was performed using Suzuki coupling reaction of dibromo-[2,2]-paracyclophane with boronic acid derivative. The fluorescence quantum yield and the emission lifetime ware measured. 2.6-fold fluorescence enhancement was observed in the fixed pseudo-para derivative. The fluorescence rate constant and non-radiative rate constant ware calculated. Non-radiative rate constant was similar in these two derivatives but the fluorescence rate constant was increased in the fixed derivative. Therefore, the fluorescence rate constant was suggested to be the main factor.
