ORGN 657 |
| A squaraine dye with bulky end groups is employed as the thread component in two Leigh-type amide rotaxanes. The rotaxanes are synthesized in a simple two step process. X-ray crystal structures of the rotaxanes show that the pyridyl-containing macrocycle is more rigid and wraps more tightly around the cyclobutene core of the squaraine thread compared to the isophthalamide-containing macrocycle. The rotaxanes exhibit photophysical properties that are similar to the precursor squaraine. The encapsulating macrocycle greatly increases the chemical stability of the squaraine thread, and inhibits aggregation-induced broadening of its absorption spectrum. It should be possible to prepare squaraine derived rotaxanes with improved properties for a wide range of photophysical, photochemical and biomedical applications.
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Materials, Devices, and Switches
1:00 PM-5:00 PM, Thursday, 30 March 2006 Georgia World Congress Center -- Georgia Ballroom 2, Oral
Division of Organic Chemistry |
