ORGN 409 |
| Amar H. Flood1, Hsian Rong Tseng1, Yi Liu2, Dongmin Wu3, Paul A. Bonvallet4, Xiang Zhang3, and J Fraser Stoddart1. (1) Department of Chemistry and Biochemistry, California NanoSystems Institute, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095-1569, (2) Department of Chemistry and Biochemistry and California NanoSystems Institute, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095-1569, (3) Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, (4) Department of Chemistry and Biochemistry, University of California Los Angeles, 405 Hilgard Ave., Los Angeles, CA 90095-1569 |
| Bistable [2]rotaxanes have been incorporated into electronic memory devices that display binary switching between high and low conductance states. Rotaxanes are mechanically interlocked molecules that consist of a dumbbell-shaped component that is interlocked with a ring-shaped component. Redox-active rotaxanes utilize the donor units, tetrathiafulvalene (TTF) and 1,5-dioxynaphthalene (DNP), which are incorporated into the dumbbell component, and an electron acceptor, the cyclobis(paraquat-p-phenylene) tetracationic macrocycle (CBPQT4+) as the ring component. The ring can be mechanically switched from the TTF to the DNP unit, and back again, using oxidative processes that are localized on the TTF unit. However, this is not the only pathway for switching within this class of rotaxanes. This talk will outline the different routes for switching in interlocked molecules based on an analysis of electrochemical and UV-visible spectroelectrochemical studies. Evidence for metastability in rotaxanes, a phenomenon also displayed in devices, will be presented. |
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Materials, Devices, and Switches
8:00 AM-12:00 PM, Wednesday, March 31, 2004 Anaheim Convention Center -- 303A, Oral
Division of Organic Chemistry |
