Abstract
Four novel homochiral mononuclear spin-crossover iron(II) complexes 1–4 have been successfully synthesized by subcomponent self-assembly of Fe(ClO4)2, 1-substituted imidazole-2-carboxaldehyde and optical phenylethylamine derivatives. X-ray crystallography revealed that the iron(II) center in 1–4 assumed an octahedral coordination environment with 6 N donor atoms from three unsymmetrical bidentate chiral Schiff-base ligands. [Fe(Ln)3]2+ components were chiral with either Λ or Δ configuration due to the screw coordination arrangement of the chiral ligands around Fe(II) center. Circular dichromism spectra confirmed the presence of non-racemic chiral metal centers in solution for 1–4. Magnetic measurements revealed that 1–4 displayed obviously spin-crossover behavior at 257, 375, 137 and 282K, respectively. The different SCO behaviors of 1–4 may result from substitution effect, packing mode, and intermolecular interactions.
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