Chiral spin crossover iron(II) complex, fac-Λ-[FeII(HLR)3](ClO4)2·EtOH (HLR = 2-methylimidazol-4-yl-methylideneamino-R-(+)-1-methylphenyl)

► A chiral SCO complex fac-Λ-[FeII(HLR)3](ClO4)2·EtOH was synthesized. ► The crystal structures at the high-spin and low-spin states were determined. ► The complex exists as the facial-Λ-isomer of fac-Λ-[FeII(HLR)3]2+. ► The R-form of the ligand induces the fac-Λ-isomer. ► The complex shows a complete SCO between the HS and LS states at T1/2 = 195 K.