- Photoinduced dynamics in hydrogen-bonded rotaxanes
- Pure and Applied Chemistry
- Volume | Issue number
- 75 | 8
- Number of pages
- Document type
- Faculty of Science (FNWI)
- Van 't Hoff Institute for Molecular Sciences (HIMS)
Two classes of rotaxanes are described in which photoinduced processes modulate a large-amplitude motion. In the first type, E-Z-isomerization of a fumaric diamide unit to a maleic diamide leads to a substantial weakening of the hydrogen bonds between the diamide and the macrocyclic ring that surrounds it. As a result, the rate of the pirouetting motion is increased approximately by six orders of magnitude. In the second type, intermolecular photoinduced electron transfer is used to induce a reversible shuttling motion on a time scale of microseconds. Medium effects on the rate of shuttling are presented.
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