Synthesis, characterization and crystal structure determination of iron(III) hetero-ligand complexes containing 2,2′-bipyridine, 5,5′-dimethyl-2,2′-bipyridine and chloride, [Fe(bipy)Cl4][bipy·H] and [Fe(dmbipy)2Cl2][FeCl4]

The complex [Fe(bipy)Cl4][bipy·H] (1) (bipy is 2,2′-bipyridine) was prepared from the reaction of FeCl3 · 6H2O with 2,2′-bipyridine in a 0.1 M aqueous solution of HCl. The same method was employed to make [Fe(dmbipy)2Cl2][FeCl4] (2) (dmbipy is 5,5′-dimethyl-2,2′-bipyridine). Both complexes were characterized by IR, UV–Vis and 1H NMR spectroscopies and single-crystal X-ray diffraction. These complexes are HS with a spin multiplicity of 6. Crystal data for 1 at 20 °C: orthorhombic, space group Pna21, a = 15.938(2) Å, b = 9.3068(15) Å, c = 14.513(3) Å, Z = 4, R1 = 0.0406 and for 2 at 20 °C: triclinic, space group P1¯, a = 8.6072(13) Å, b = 18.008(3) Å, c = 20.311(3) Å, α = 103.652(13)°, β = 95.421(12)°, γ = 98.724(13)°, Z = 4, R1 = 0.0634.

The complex [Fe(bipy)Cl4][bipy·H] (1) (bipy is 2,2′-bipyridine) was prepared from the reaction of FeCl3 · 6H2O with 2,2′-bipyridine in a 0.1 M aqueous solution of HCl. The same method was employed to make [Fe(dmbipy)2Cl2][FeCl4] (2) (dmbipy is 5,5′-dimethyl-2,2′-bipyridine). Both complexes were characterized by IR, UV–Vis and 1H NMR spectroscopies and single-crystal X-ray diffraction.Figure optionsDownload as PowerPoint slide