title: Effect of α- and β-cyclodextrins on the intramolecular charge transfer and intramolecular proton transfer fluorescence of methyl o-hydroxy p-dimethylaminobenzoate.
abstract: The influence of α- and β-cyclodextrins on the spectral characteristics of methyl o-hydroxy p-dimethylaminobenzoate has been studied using steady-state and time-resolved spectroscopic technique. The stoichiometries and equilibrium constants of the solute molecule-cyclodextrin inclusion complexes have been determined by the steady-state fluorescence measurements. Nonlinear least-squares regression analysis indicates that both 1:1 and 1:2 inclusion complexes were formed between studied compound and α- and β-cyclodextrins. The contribution of the fluorophore in free, 1:1, and 1:2 complexes was calculated for a particular concentration of α- and β-CD. Additionally, the location of the fluorophore inside the cavity was reported, with regard to the intra- and intermolecular proton transfer and intramolecular charge transfer processes.
authors.affiliation: Institute of Experimental Physics, University of Gdańsk, ul. Wita Stwosza 57, 80-952 Gdańsk, Poland. fizmj@univ.gda.pl
authors.forename: Marek
authors.initials: M
authors.lastname: Józefowicz
mesh_terms: D006860:Hydrogen Bonding; D011522:Protons; D013050:Spectrometry, Fluorescence; D047391:alpha-Cyclodextrins / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*; D062366:para-Aminobenzoates
chemical_list: D011522:Protons; D047391:alpha-Cyclodextrins; D047392:beta-Cyclodextrins; D062366:para-Aminobenzoates