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Irradiation by red light at T ≲ 40 K induces the transition of the stable high‐spin state of 1 to a metastable low‐spin state, which, at T < 40 K, has a lifetime of days to weeks, The transition occurs via double intersystem crossing, 5T2 → 5E → 3T1 → 1A1. Compound 1 is only the second compound to show this effect. equation image
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Gütlich et al. (1991) studied this question.
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