摘要
合成并表征了 6种苯并咪唑 (BzIm)、苯并噻唑 (BzTa)和苯并恶唑 (BzAz)作为尾端基团的卟啉铁 (Ⅲ )配合物 ,以UV_vis光谱技术测定了配合物与咪唑等形成的加合物稳定常数 β2 、跟踪了抗坏血酸存在下O2 和卟啉铁 (Ⅱ )的反应过程 .结果表明 ,由于尾端基团对中心铁 (Ⅲ )和铁 (Ⅱ )的配位 ,使稳定常数增大。
The stability constants (β 2) of bis(imidazole) adducts of heterocyclic bases 2-benzimidazole(BzIm), 2-benzthiazole(BzTa) and 2-benzazole (BzAz)-linked iron(Ⅲ) porphyrin complexes in CHCl 3 were measured by UV-vis spectrophotometer between 25.0～45.0 ℃. The β 2 is greater than that of bis(imidazole) adduct of TPPFe ⅢCl. The reaction of iron(Ⅱ) porphyrin with dioxygen in Me 2CO-H 2O (V/V=10/1) in the presence of ascorbic acid was also monitored at 25.0 ℃ and the reactive species was quite stable. These results indicate that the axial ligand plays an important role on stabilization of the adducts and reactive species of the iron(Ⅲ) porphyrin complexes. The possible reasons are discussed in detail.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第6期35-38,共4页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金资助项目 (2 0 0 710 34 )
福建省自然科学基金资助项目 (D0 0 10 0 0 9)
华侨大学博士启动科研基金资助项目
