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A New Spin-Crossover-Complex Phase Generated by Photo-Induced Phase Transition

We clarified that photo-induced phase is quite different in structure from the thermally-induced phase by resonant Raman and infrared absorption spectroscopy in the spin-crossover complex, [Fe-(2-pic) 3 ]Cl 2 EtOH. In the photo-induced phase we observed a number of additional Raman lines which are not observed in the thermally-induced phases. The infrared absorption spectrum of the photo-induced phase has different structures from those of thermally-induced phases. The additional Raman lines are assigned to infrared-active vibrational modes that are strongly prohibited by selection rules in the thermally-induced phase. These results indicate that a dramatic symmetry lowering should take place in the photo-induced phase.