对5,10,15-三(五氟苯基)-Corrole(tpfc)MnV≡≡O配合物的稳定性进行了研究.以二氯甲烷为参考溶剂,在乙醇、正辛醇、乙醚、四氢呋喃、二甲基亚砜和甲苯中(tpfc)MnⅤ≡≡O的稳定性降低,而在N,N-二甲基甲酰胺、水、乙酸乙酯和丙酮中(tpfc)MnⅤ≡≡O的稳定性提高.(tpfc)MnⅤ≡≡O与盐酸和醋酸反应分别生成(tpfc)MnⅣCl和(tpfc)MnⅣAc.(tpfc)MnⅢ能与咪唑、4-甲基咪唑及吡啶形成1∶1的配合物,轴向配位常数按咪唑〉4-甲基咪唑〉吡啶顺序减弱,在这些轴向配体存在时,(tpfc)MnⅤ≡≡O的稳定性显著降低.轴向配体与(tpfc)MnⅢ的结合导致其MnⅢ/MnⅤ半波电位降低.X射线光电子能谱(XPS)结果表明,(tpfc)MnⅢ与轴向配体结合后,其中心金属锰的结合能Mn2p3/2减少,减少程度与轴向配体的给电子能力有关.
The stability of 5,10,15-tris(pentafluorophenyl)Corrole(tpfc) manganese(V)-Oxo in different solvents and in the presence of axial ligand were investigated.The results show that ethanol,octanol,ethyl ether,tetrahydrofuran,dimethyl sulfoxide and toluene could accelerate the decay of(tpfc)MnⅤ≡≡O using dichloromethane as reference,and N,N-dimethyl formamide,water,ethyl acetate and acetone could slow down the decay of(tpfc)MnⅤ≡≡O.The reaction of(tpfc)MnⅤ≡≡O and hydrochloric acid and acetic acid yielded(tpfc)MnⅣCl and(tpfc)MnⅣAc,respectively.The axial coordination of(tpfc)MnⅢ by imidazole,4-methylimidazole and pyridine gave 1∶1 complexes.The association constants followed an order of imidazole4-methylimidazolepyridine.In the presence of these axial ligands,the stability of(tpfc)MnⅤ≡≡O decreased significantly.The MnⅢ/MnⅣ half-wave potential of(tpfc)MnⅢ moved negatively upon combination with axial ligand.X-Ray photoelectron spectroscopy(XPS) results show that the binding energy of center manganese Mn2p3/2 decreased after axial coordination,and the extent of reduction depends on the electron-donor capacity of axial ligand.