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

Absorption and fluorescence spectra of the nitrogen polycyclic aromatic hydrocarbon carbazole (CZL) were analyzed with native cyclodextrins (CD; α,β,γ); derivatized CD (hydroxypropyl-β-cyclodextrin, HPCD; methyl-β-cyclodextrin, MeCD) and p-sulfonated calixarenes (SCAn, with n= 6 and 8) macrocycles. The results showed a slight increase in the absorbance of CZL with CD, but the mixture of CZL with SCA showed lower absorption than the sum of the individual spectra. Also, changes in fluorescence were observed by adding the macrocycles, quenching with SCA, and significant increases with CD. The higher fluorescence enhancement was with HPCD rationalized as a complex formation with 1:1 stoichiometry, with an average value for the association constant (KA) of (12 ± 1) x 10

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