CHED 1496 |
| Biological molecular motors, such as F1-ATPase, have inspired chemists to devise artificial analogs of potential use in nanotechnology. This presentation briefly reviews the major types of natural and artificial molecular motors, then presents the author's own approach to molecular motors based on photoisomerization of substituted 9-(2,2,2-triphenylethylidene)fluorenes. Quantum yields for photoisomerization of the 2-tert-butyl derivative at various wavelengths are significant, ranging from 4 9% (J.W. Barr, T.W. Bell, V.J. Catalano, J.I. Cline, D.J. Phillips, R. Procupez, J. Phys. Chem. 2005, A109, 11650-11654), despite theoretical prediction of inefficient or negligible isomerization of the parent hydrocarbon, fulvene. We have also synthesized several analogs with polar substituents, which increase absorption wavelengths and can greatly enhance photoisomerization quantum yields in this system. The current status of our efforts to synthesize the target molecular motor, containing a chiral triarylmethane moiety, is also described.
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Chemical Evolution from Origins of Life to Modern Society
1:30 PM-4:55 PM, Tuesday, April 8, 2008 Hilton New Orleans Riverside -- Jasperwood, Oral
Division of Chemical Education |
