The dynamics of the photoinduced phase transition was investigated in a prototypical spin crossover complex, [Fe(ptz)₆](BF₄)₂0.3em0ex(ptz=1-propyltetrazole), under photoexcitation at 77 K near the transition temperature (Tc=1300.3em0exK). When the excitation power I exceeds ≈10.3em0exmW∕mm², we observed an ``acceleration'' of the creation rate of the density nHS of the high-spin (HS) species after a characteristic incubation period. The ``acceleration'' is interpreted in terms of the negative pressure effect; the photocreated HS species with a larger ionic radius expands the volume to cause the structural phase transition.
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Moritomo et al. (2006) studied this question.
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