INOR 249 |
| Photochromic compounds are molecular devices which convert photonic energy to potential energy, which is employed in bond-breaking and bond-making processes. Our examinations of ruthenium and osmium polypryridine complexes containing monodentate sulfoxide and chelating sulfoxide ligands demonstrate that S-to-O isomerization is efficient, and can occur rapidly in the solid state. For example, the isomerization quantum yield may vary from <0.0001(1) in [Ru(tpy)(acac)(dmso)]+ (tpy is 2,2′:6′,2″-terpyridine; acac is acetylacetonate) to 0.80(1) in [Ru(tpy)(Mepic)(dmso)]2+ (Mepic is 6-methyl-2-pyridinecarboxylate). In accord with these data, picosecond transient absorption spectroscopic data show that S-to-O isomerization time constant may be as fast as 80 ps. Recent studies of ruthenium polypyridine complexes containing chelating sulfoxides illustrate that efficient energy conversion may also be achieved. In conjunction with nanosecond and picosecond transient absorption spectroscopy data, structural and electrochemical data will be presented as well as a structural model to understand the photochemistry and photophysics of these compounds. |
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Frontiers of Inorganic Chemistry: The Gray Areas
7:00 PM-10:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster
Sci-Mix
Division of Inorganic Chemistry |