INOR 654 |
| Photochromic complexes of the type [Ru(tpy)(L2)(dmso)]z+ (tpy is 2,2';6',2”-terpyridine, L2 is a variable bidentate ligand, and dmso is dimethylsulfoxide) exhibit photochemically induced linkage isomerization of the dimethylsulfoxide. Our previous results demonstrate that subtle changes in ligand environment allow efficient S-to-O linkage isomerization within these bistable complexes. For example the isomerization quantum yield may be varied from 0.024 to 0.79. Large changes in isomerization quantum yields indicate significant differences in the excited state S-to-O dmso isomerization rate within this family of complexes. Picosecond transient absorption spectroscopy of photochromic ruthenium dmso complexes (when L2 is 2,2'-bipyridine (bpy), picolinate (pic), and 6-methylpicolinate (Mepic)) is reported. In accord with quantum yield data, isomerization time constants vary from 1.5 ns to ~80 ps. These results are compiled with previous photochemical and electrochemical data to present electronic structural models describing the photochemistry and photophysics of these complexes. |
|
Coordination Chemistry: Characterization and Applications
7:00 PM-10:00 PM, Tuesday, 12 September 2006 Moscone Center -- Hall D, Poster
Sci-Mix
Division of Inorganic Chemistry |