International Summer School PROGRAM - Laboratoire d'Infochimie ...

Supramolecular devices based on photoresposive assemblies of
cucurbit[7]uril and crown-ether derived styryl and (bis)styryl dyes
lga A. Fedorova, 1* Ekaterina Yu. Chernikova, 1 Yuri V. Fedorov, 1
lena N. Gulakova, 1 Gediminas Jonusauskas, 2 Lyle Isaacs 3*
1
A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of
Sciences, 28 Vavilova str., Moscow, 119991 Russia, fedorova@ineos.ac.ru,
2
Laboratoire Ondes et Matière d’Aquitaine – Bordeaux University I, UMR CNRS
5798, 351 Cours de la Libiration, 33405 Talence, France,
3
Department of Chemistry and Biochemistry, University of Maryland, College Park,
MD 20742, USA
The rigid structure, good water solubility, and ability to form tight complexes
with molecules and ions make CB[7] particularly attractive as a building block for the
construction of supramolecular architectures and devices. This report describes the
interaction of CB[7] molecular container with crown ether styryl and (bis)styryl dyes by
(1) cation-dipole interactions between the positively charged dyes and the ureidyl C=O
dipoles which line the CB[n] portals, and (2) hydrophobic interactions between the
guest and the CB[n] host cavity. We found that the composition of the formed
complexes depends on the relative stoichiometry of dye and CB[7].
For the monostyrylic dyes the photoinduced moving of exited dye in CB[7]
cavity was proved by analysis of the steady state and time-resolved fluorescence as well
as pump-probe experimental results. The behavior of the complexes of dyes with CB[7]
similar to moving of piston in cylinder which uses the light photon energy to move.
Acknowledgments to RFBR program (09-03-00241) and IRG “SUPRACHEM” for
financial support.