Infrared Study of Spin Crossover Fe-Picolylamine Complex

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Infrared (IR) absorption spectroscopy has been used to probe the evolution of microscopic vibrational states upon the temperature- and photo-induced spin crossovers in [Fe(2-picolylamine)3]Cl2EtOH (Fe–pic). To overcome the small sizes and the strong IR absorption of the single crystal samples used, an IR synchrotron radiation source and an IR microscope have been used. The obtained IR spectra of Fe–pic show large changes between high-spin and low-spin states, for both the temperature- and the photo-induced spin crossovers. In contrast, the spectra in the temperature- and photo-induced high-spin states are relatively similar to each other, however they show distinct differences below 750 cm−1. This demonstrates that the photo-induced high-spin state involves microscopically different characters from those of the temperature-induced high-spin state. The results are discussed in terms of local pressure and structural deformations within the picolylamine ligands, and in terms of their possible relevance to the development of macroscopic photo-induced phase in Fe–pic.

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