Abstract
A photo-induced phase transition in the spin crossover complex Fe(pyrazine)[Pt(CN) 4] has been triggered by a 4 ns green pulsed laser excitation within its thermal hysteresis loop. Complete spin conversion from the low spin to the high spin state has been repeatedly observed by irradiating a polycrystalline powder sample. In addition, the non-linear behaviour of the photoconversion efficiency and, in particular, the occurrence at ca. 5 mJ/cm 2 of an energy density threshold, below which no light-induced phase transition appears, is observed. This threshold is shown to be temperature dependent, which is confirmed by a simple theoretical description.
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