EFFECT OF THE FORMATION OF INCLUSION COMPLEXES WITH BETA-CYCLODEXTRINON THE PHOTOISOMERIZATION AND FLUORESCENCE PROPERTIES OF AROMATIC NORBORNADIENE DERIVATIVES
M. Maafi et al., EFFECT OF THE FORMATION OF INCLUSION COMPLEXES WITH BETA-CYCLODEXTRINON THE PHOTOISOMERIZATION AND FLUORESCENCE PROPERTIES OF AROMATIC NORBORNADIENE DERIVATIVES, Journal of inclusion phenomena and molecular recognition in chemistry, 30(3), 1998, pp. 227-241
Citations number
55
Categorie Soggetti
Chemistry,Crystallography
Journal title
Journal of inclusion phenomena and molecular recognition in chemistry
The valence photoisomerization of four aromatic norbornadiene (NBD) de
rivatives has been studied in ethanol and in 0.01 M beta-cyclodextrin
(beta-CD) water-ethanol (v/v, 99/1) solution (WECD). Observed first-or
der rate constants are found to be of the same order of magnitude in e
thanol and WECD, ranging between 0.1 and 0.28 s(-1), according to the
compound. These photoisomerization kinetic properties are attributed t
o the formation of inclusion complexes between NBDs and beta-CD. The s
toichiometry is 1 : 1, and association constants ranging between 310 a
nd 390 M-1 have been determined fluorimetrically, using Benesi-Hildebr
and plots and a nonlinear regression method. The structure of the incl
usion complexes is discussed on the basis of AMI semiempirical dimensi
on calculations and photophysical properties.