Magnetic circular dichroism spectroscopy of zinc(II) tetraphenylporphyrin-ligand complexes: The effect of the axial ligand on spectral properties
摘要:
The magnetic circular dichroism (MCD) spectra in the UV-visible spectral region (300-700 nm) of an extensive set of zinc tetraphenylporphyrin (ZnTPP) complexes with oxygen, nitrogen and sulfur donor axial ligands are reported. Because zinc porphyrins do not change oxidation or spin states and only bind one axial ligand, this study evaluates the effect of the axial ligand on the MCD spectral properties. The three types of axial ligand complexes can be discriminated by examination of the MCD band positions and intensities for the Soret, beta and alpha transitions of each ZnTPP adduct.