Light-induced piston nanoengines: ultrafast shuttling of a styryl dye inside cucurbit[7]uril

Ekaterina y Chernikova (1) , Daria V Berdnikova (1, 2) , Yuri V Fedorov (1) , Olga A. Fedorova (1) , François Maurel (3) , Gediminas Jonusauskas (4)

1 INEOS - A. N. Nesmeyanov Institute of Organoelement Compounds
2 People's Friendship University of Russia [Moscow]
3 ITODYS (UMR_7086) - Interfaces, Traitements, Organisation et Dynamique des Systèmes
4 LOMA - Laboratoire Ondes et Matière d'Aquitaine

The combination of photoactive styryl(pyridinium) dyes and cucurbit[7]uril (CB[7]) in an integrated supramolecular system allowed us to design a novel high speed molecular machine based on the fully reversible shuttling motion of the dye inside the CB[7] host cavity. The driving force of this movement is the electrostatic potential change after the occurrence of intramolecular charge transfer in the excited state of the dye molecule that can be externally controlled by light. Steady-state and time-resolved optical spectroscopy as well as DFT calculations provided an unambiguous evidence for the ultrafast piston-like movement of the system between two states. The shuttling process occurs in the picosecond timescale and its bistability depends on the strength of the dye donor fragment.

Domaines: Chimie-Physique [physics.chem-ph]

Ekaterina y Chernikova, Daria V Berdnikova, Yuri V Fedorov, Olga A. Fedorova, François Maurel, et al.. Light-induced piston nanoengines: ultrafast shuttling of a styryl dye inside cucurbit[7]uril. Physical Chemistry Chemical Physics, 2017, 19 (38), pp.25834-25839. ⟨10.1039/C7CP04283C⟩. ⟨hal-01627994⟩