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A bistable system can rest in two phases,which have a minimum free energy,and two phases can be switched by applying external stimuli.Bistable molecules have been,therefore,attracted intense research interests due to potential applications to molecular switches and memory devices.Spin-crossover (SCO) complexes undergo spin transitions between high-spin (HS) and low-spin (LS) states,and some showed thermal hysteresis and LIESST phenomena.