Publications [#233692] of Richard A. Palmer

Journal Articles

  1. Chen, P; Palmer, RA, "Ten-nanosecond step-scan FT-IR absorption difference time-resolved spectroscopy: Applications to excited states of transition metal complexes", Applied SpectroscopyJanuary,, 1997, 51(4), 580-583, SAGE Publications [Gateway.cgi], [doi].
    (last updated on 2024/11/19)

    Abstract:
    Ten-nanosecond time resolution has been achieved with step-scan FT-IR absorbance difference spectroscopy (S2FT-IR ΔA TRS) and demonstrated by measuring ΔA spectra of fac-[Re(bpy)(CO)3Cl] and cis-[Os(bpy)2(CO)(4,4′-bpy)]2+ (bpy = 2,2′-bipyridine; 4,4′-bpy =4,4′-bipyridine) in CH3CN solution, following 355-nm laser excitation. In both complexes, the large shifts in v̄(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)2(CO)(4,4′-bpy)]2+, it is also possible to measure the excited-state decay kinetics, again with 10-ns resolution. In addition, ΔA bands are observed that are related to excited-state vibrations of the bipyridine ligands. ΔA spectra of good signal-to-noise ratio can be obtained for complexes with lifetimes as short as 10 ns.