Abstract
A light-induced excited spin state trapping (LIESST) experiment for a thermal gradual spin crossover complex, Fetris (2-pyridylmethyl) amine(NCS)2 or Fe(tpa) (NCS)2, was attempted for the first time. The high spin (HS) state after light inducement stayed metastable over a period of days without relaxation at 10 K. Intersystem relaxation from a high to a low spin (LS) complex occurred at 50 K after bleaching at 10 K. Investigation of the Mossbauer spectra of the LIESST and relaxation experiment indicated that the Debye–Waller factor was a correlation parameter of the HS fraction and that the co-operative effect played a role in the relaxation process for such a solid compound.
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Yu, Z., Hsia, Y.F., You, X.Z. et al. The lattice dynamics of the Fe(tpa) (NCS)2 complex : light-induced excited spin state trapping effect. Journal of Materials Science 32, 6579–6581 (1997). https://doi.org/10.1023/A:1018627714649
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DOI: https://doi.org/10.1023/A:1018627714649