The inclusion complexation of dye guest molecules with water-soluble calixarene

The inclusion complexation of some dye guest molecules with water - soluble calix[n] arenesulfonates (n =4,6,8) and alkylated calix[6]arenesulfonates has been investigated at 25.0 degreesC. It was found that the fluorescence intensity of dye guests decreases upon the addition of calix[n] arenesulfon ates. while the alkylated calix[6] arenesulfonate derivatives cause gradual increases in the fluorescence intensity of dye guest. The phenomena were e xplained in terms of photophysical behavior. The stability constants of the resulted complexes were determined via spectrofluorometric titration at 25 .0 degreesC and the molecular recognition behavior was also discussed.