We will present our recent results on the light induced structural dynamics of molecules in solution using an optical probe/X-ray probe method based on X-ray absorption spectroscopy. This approach was applied to the case of Iron (II)-based complexes, which undergo a spin change from singlet to quintet. We have determined the structure of the high spin excited state, which has a lifetime of 0.6 ns. the structural determination was obtained using exploiting both the XANES and the EXAFS features. In a recent development, 100 femtosecond hard X-ray pulses have been extracted from the SLS synchrotron. We will present our preliminary results where we follow the ultrafast XANES changes, the evolution of the system from the initially excited singlet charge transfer state into the lowest excited quintet state, on a time scale of 1 ps.

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