Ten-nanosecond time resolution has been achieved with step-scan FT-IR absorbance difference spectroscopy (S2FT-IR Delta A TRS) and demonstrated by measuring Delta A spectra of fac -[Re(bpy)(CO) Cl] 3and cis -[Os(bpy) (CO)(4,4 ' -bpy)]2+(bpy = 2,2 ' -bipyridine; 4,4 ' -bpy 2= 4,4 ' -bipyridine) in CH CN solution, following 355-nm laser exci3 tation. In both complexes, the large shifts in upsilon (CO) to higher energy are consistent with the assignment that the lowest-energy excited states are metal-to-ligand charge transfer in nature. For [Os(bpy) (CO)(4,4 ' -bpy)]2+, it is also possible to measure the excit2 ed-state decay kinetics, again with 10-ns resolution. In addition, Delta A bands are observed that are related to excited-state vibrations of the bipyridine ligands. Delta A spectra of good signal-to-noise ratio can be obtained for complexes with lifetimes as short as 10 ns.

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