Fluorometric study of the inclusion interaction of beta-cyclodextrin derivatives with tetraphenylporphyrin and its analytical application.
The effects of native beta-cyclodextrin (beta-CD) and four kinds of alkylated beta-cyclodextrin (beta-CDs), i.e. heptakis (2,6-di-O-isobutyl-beta-cyclodextrin) (I), heptakis (2,6-di-O-octyl-beta-cyclodextrin) (II), heptakis (2,6-di-O-dodecyl-beta-cyclodextrin) (III), and heptakis (2,6-di-O-hexadecyl-beta-cyclodextrin) (IV), on the fluorescence behaviors of tetraphenylporphyrin (TPP) are investigated. An obvious fluorescence enhancement is observed from TPP by using alkylated derivatives compared to that obtained in beta-CD aqueous or in water. A 114-N fluorescence emission intensity enhancement is found for the complex with 2,6-di-O-octyl-beta-cyclodextrin relative to the free analyte. The exact stoichiometric ratios and the formation constants of the inclusion complexes have been examined by application of curve fitting method. The linear calibration plots between fluorescence intensity and TPP concentration are determined in the 1.14 x 10(-8)-5.06 x 10(-6) mol l(-1) range.
Yang
R
R
College of Chemistry and Chemical Engineering, Hunan University, Changsha, People's Republic of China.
Wang
K
K
Xiao
D
D
Yang
X
X
D000478:Alkylation; D003505:Cyclodextrins / Q000737:chemistry*; D003912:Dextrins / Q000737:chemistry*; D005453:Fluorescence; D015590:Fluorophotometry / Q000379:methods; D006863:Hydrogen-Ion Concentration; D015394:Molecular Structure; D011166:Porphyrins / Q000737:chemistry*; D012997:Solvents; D047392:beta-Cyclodextrins
D003505:Cyclodextrins; D003912:Dextrins; D011166:Porphyrins; D012997:Solvents; D047392:beta-Cyclodextrins; C444240:heptakis (2,6-di-O-hexadecyl-beta-cyclodextrin); C443844:heptakis (2,6-di-O-isobutyl-beta-cyclodextrin); C444239:heptakis (2,6-di-O-octyl-beta-cyclodextrin); C409084:tetraphenylporphyrin; C031215:betadex