Synthesis, infrared spectra, thermal analyses and structural studies of half-sandwich Fe(III)/Fe(II) complex containing pyridine-2,6-dicarboxylate and 1,10-phenanthroline

A new pyridine-2,6-dicarboxylate iron(III)/iron(II) complex [Fe(phen)(3)][Fe(2)(PDC)(4)].3CH(3)OH was synthesized and characterized (where PDC=pyridine-2,6-dicarboxylate, phen=1,10-phenanthroline) by using elemental analysis, IR spectroscopy and thermal analyses (TGA and DTA). The molecular structure of the complex has been determined by single-crystal X-ray diffraction. The complex is mixed-ligands and the IR spectra display bands characteristic of coordinated mixed-ligand bases. All the IR results are in agreement with the X-ray crystal result. The bond lengths indicate that this complex has [Fe(phen)(3)](2+) cation where Fe(II) ion is in typical low-spin state, and in counter ions, [Fe(PDC)(2)](-) are both in high-spin state.