Electronic Spectra and Electronic Structure of Iron(II) Tetraphenylporphins

Abstract Tetraphenylporphiniron(II) was synthesized and isolated in a pure state. The iron(II) porphin was in the state of S=2. The spin state of iron(II) porphin varies with the axial ligand field. Oxygeneous axial ligands such as tetrahydrofuran and dioxane gave an intermediate spin state (S=1), while nitrogeneous ligands such as pyridine gave a diamagnetic state (S=0). The electronic spectra of tetraphenylporphin complexes of iron(II) were measured for the three types of the spin state.