A STUDY OF AGGREGATION OF 9-(DICYANO-VINYL)JULOLIDINE

Di(cyano vinyl)julolidine (DCVJ) is a fluorescent probe which has been used to monitor the local mobility of its binding sites on proteins. It shows a concentration dependence of its emission spectrum in water. At higher DCVJ concentrations, a longer wavelength band appears. The latter increases relative to the shorter wavelength band as a function of increased DCVJ concentration. Absorption and excitation spectra in dicate that the concentration dependent emission in the longer wavelen gth is a consequence of association in the ground state and subsequent excimer formation. DCVJ forms two types of complexes with gamma-cyclo dextrin, one of which shows the longer wavelength emission band. Analy sis of stoichiometry of association also suggests that longer waveleng th emission band may be a consequence of association of two molecules of DCVJ in the gamma-cyclodextrin cavity. Possible uses of such excime r formation in biological systems have also been discussed.