Chernikova Ekaterina Y, Berdnikova Daria V, Fedorov Yuri V, Fedorova Olga A, Maurel François, Jonusauskas Gediminas
A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, 119991 Moscow, Russia.
Phys Chem Chem Phys. 2017 Oct 4;19(38):25834-25839. doi: 10.1039/c7cp04283c.
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.
在一个集成超分子体系中，光活性苯乙烯基（吡啶鎓）染料与葫芦[7]脲（CB[7]）的结合，使我们能够基于染料在CB[7]主体腔内的完全可逆穿梭运动设计出一种新型高速分子机器。这种运动的驱动力是染料分子激发态发生分子内电荷转移后静电势的变化，而这种变化可通过光进行外部控制。稳态和时间分辨光谱以及密度泛函理论计算为该体系在两种状态之间的超快活塞式运动提供了明确证据。穿梭过程发生在皮秒时间尺度上，其双稳态取决于染料供体片段的强度。
