Calixarenes and cyclodextrins as off- and on-fluorescence probes for carbazole.

Absorption and fluorescence spectra of the nitrogen polycyclic aromatic hydrocarbon carbazole () were analyzed with native cyclodextrins (;,,); derivatized(hydroxypropyl--cyclodextrin,; methyl--cyclodextrin,) and p-sulfonated calixarenes (, with n = 6 and 8) macrocycles. The results showed a slight increase in the absorbance ofwith, but the mixture ofwithshowed lower absorption than the sum of the individual spectra. Also, changes in fluorescence were observed by adding the macrocycles, quenching with, and significant increases with.