ORGN 352 |
Controlling the helical chirality of donor-acceptor [2]catenanes
| Scott Vignon, Department of Chemistry and Biochemistry, California NanoSystems Institute, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095-1569 and J. Fraser Stoddart, California NanoSystems Institute and Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095. |
| Recently we have demonstrated the helical chirality inherent in certain donor-acceptor [2]catenanes. The two helical enantiomers are interconverted by a rotation, which has been dubbed ring rocking, about the mechanical bond between the two rings of {[2]-[bis-p-phenylene-34-crown-10]-[cyclobis(paraquat-4,4x-biphenylene)]catenane}[PF6]4 and other related catenanes. Further work to try and harness this rocking process for use as a molecular switch will be presented. Two approaches are currently being pursued. The first involves using covalently linked chiral units to influence the helical chirality. The second approach involves modification of the crown ether ring of the catenane to allow control of the chirality via external stimuli, i.e., electric fields. 
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Materials, Devices, and Switches
1:00 PM-5:00 PM, Tuesday, August 24, 2004 Pennsylvania Convention Center -- 201B, Oral
Division of Organic Chemistry
The 228th ACS National Meeting, in Philadelphia, PA, August 22-26, 2004
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