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We study the structural dynamics of photoexcited [Co(terpy)2]2+ in an aqueoussolution with ultrafast x-ray diffuse scattering experiments conducted at theLinac Coherent Light Source. Through direct comparisons with density functionaltheory calculations, our analysis shows that the photoexcitation event leads toelongation of the Co-N bonds, followed by coherent Co-N bond lengthoscillations arising from the impulsive excitation of a vibrational modedominated by the symmetrical stretch of all six Co-N bonds. This mode has aperiod of 0.33 ps and decays on a subpicosecond time scale. We find that theequilibrium bond-elongated structure of the high spin state is established on asingle-picosecond time scale and that this state has a lifetime of ~ 7 ps.

Femtosecond X-Ray Scattering Study of Ultrafast Photoinduced Structural Dynamics in Solvated [Co(terpy)2]2+