Insights into the excited state dynamics of Fe( ii ) polypyridyl complexes from variable-temperature ultrafast spectroscopy

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In order to better define the nature of the nuclear coordinate associated with excited state dynamics in first-row transition metal chromophores, variable-temperature ultrafast time-resolved absorption spectroscopy has been used to determine activation parameters associated with ground state recovery in a series of low-spin Fe( ii ) polypyridyl complexes.