Abstract
The effects of β-cyclodextrin (β-CyD), heptakis(2,6-di-O-methyl)-β-cyclodextrin (DMβCyD) and heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin (TMβCyD) ontrans-cis photoisomerization of 1-ethyl-4-(4′-hydroxystyryl)pyridinium (POH) have been studied in aqueous solutions. The ratio of [cis]/[trans] for POH in the photostationary state at pH 8.54 was remarkably reduced by the presence of βCyD or DMβCyD. The reduction of the [cis]/[trans] ratio in the photostationary state was explained in terms of the shift of the equilibrium of POH trans+ ⇌ PO trans + H− toward PO trans formation. The binding constants of βCyD and DMβCyD for PO trans were 2.00- and 1.36-fold larger than those for POH trans+ , respectively. The binding constants of TMβCyD for both species are much smaller than those of βCyD and DMβCyD. This result indicates that PO trans , which has a betain structure, forms stable complexes with βCyD and DMβCyD with its hydrophobic parts inside and the charged parts outside the CyD cavities.
Similar content being viewed by others
References
U. Steiner, M. H. Abdel-Kader, P. Fisher, and H. E. A. Kramer:J. Am. Chem. Soc. 100, 3190 (1978).
H. Görner, A. Fojtik, J. Wroblewski, and L. J. Currell:Z. Naturforsh. 40a, 525.
H. Görner and H. Gruen:J. Photochem. 28, 329 (1985).
H. Görner and G. Galiazzo:J. Photochem. Photobiol. 43, 139 (1988).
G. L. Gains Jr:Angew. Chem. Int. Ed. Engl. 26, 4341 (1987).
Y. Iwakura, K. Uno, F. Toda, S. Onozuka, K. Hattori and M. L. Bender:J. Am. Chem. Soc. 97, 4432 (1975).
Y-Q. Do, A. Nakamura and F. Toda:Chem. Lett. 2235 (1990).
A. Ueno, F. Moriwaki, Y. Iwama, I. Suzuki, T. Osa, T. Ohta and S. Nozoe:J. Am. Chem. Soc. 113, 7034 (1991).
P. Bortolus and Sandra Montini:J. Phys. Chem. 91, 5046 (1987).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hamasaki, K., Nakamura, A., Ueno, A. et al. Trans-cis Photoisomerization of 1-Methyl-4-(4′-hydroxystyryl)pyridinium in inclusion complexes ofβ-cyclodextrin and its derivatives. J Incl Phenom Macrocycl Chem 13, 349–359 (1992). https://doi.org/10.1007/BF01133234
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01133234