关键词: 卟啉, 磁圆二色性, 轴向配体

Abstract: The magnetic circular dichroism spectra of new tailed porphyrin iron complexes, MDMBPTPPFe(Ⅲ)Cl and MDMBPTPPFe(Ⅱ) with a series of axial ligands such as imidazole, pyri-dine,4-methylpyridine, piperidine, Et₃N, Et₂NH, n-C₄H₉NH₂,n-C₃H₇NH₂, CO, NO, were observed. The MCD of high spin ferric porphyrin complex is type Bwhich is ascribed to the angular momenta induced by the external magentic field, because of appreciable configuration mixings due to the charge-transfer excited states of exactly the same symmetry Eu³. The ligands binding to the five-coordination ferrous porphrin is accompanied by dramatic changes in the visible and soret region of the optical spectrum. The MCD of the mixing axial ligands ferrous porphyrin complexes differs form that of the bisli-gands ferrous prophyrin complexes in the region of 530 to 560 nm because of the difference between the symmetries of the two complexes. The MCD of ferrous porphyrin complexes is type A, which is contributed by the transitions from the nondegenerate ground state to the degenerate excited state.

Key words: Porphyrin, Magnetic circular dichroism(MCD), Axial ligand