White light snapshot of non-equilibrium high-spin state in a molecular crystal

Abstract

The spin-crossover compound [(TPA)Fe(TCC)]PF6 was experimentally investigated using time-resolved optical pump and supercontinuum probe technique. Changes of VIS optical density at thermal equilibrium of a crystal with different high-spin/low-spin fractions are compared to changes recorded picoseconds after femtosecond laser excitation. A white light snapshot of the high-spin state at 180 K is extracted from time-resolved spectra. Our results indicate that the temperature of the electronic state affects the absorption spectra of high-and low-spin states.