A novel Fe-II spin-crossover (SC) complex, [Fe-II(HL)(2)]-(ClO4)(2), has been synthesized, where HL denotes tridentate N-3 ligand N-methyl[2-[[(2-phenylimidazol-4-yl)methylidene]-amino]ethyl]amine). The Fe-II complex showed a steep SC at T-1/2 = 175 K without frozen-in effect and hysteresis. The crystal structures at the high-spin (HS) and low-spin (LS) states were determined. Though there is no intermolecular interaction and no frozen-in effect, LIESST (light-induced excited spin state trapping) and reverse-LIESST effects were observed.