O<sub>2</sub>and CO Binding Behavior of Double-Sided Porphyrinatoiron(II) Complexes Modified by Amide Residues
作者:Teruyuki Komatsu、Shin-ichi Kumamoto、Hiroyuki Nishide、Eishun Tsuchida
DOI:10.1246/bcsj.66.1640
日期:1993.6
New double-sided porphyrinatoiron(II) complexes having a polar cavity which includes an amide moiety (5,10,15-tris[2,6-bis(3,3-dimethylbutyryloxy)phenyl]-20-[2-[N-acetylvalyloxy]-6-(3,3-dimethylbutyryloxy)phenyl]porphinatoiron(II) (1b) and 5,10,15-tris[2,6-bis(3,3-dimethylbutyryloxy)phenyl]-20-[2-[3,5-bis(acetamido)benzoyloxy]-6-(3,3-dimethylbutyryloxy)phenyl]porphinatoiron(II) (2b)) were synthesized. 1H NMR spectroscopy indicated that the amide residues are located on the porphyrin ring plane. The O2 and CO binding affinities of 1b and 2b were higher than those of 5,10,15,20-tetrakis[2,6-bis(3,3-dimethylbutyryloxy)phenyl]porphinatoiron(II) (4b), in response to the local polarity in the cavity. The polar amide residue resulted in a decreased O2 dissociation rate. Thermodynamic parameters for the gaseous ligand bindings to the 2b complex were also determined.
新的双面卟啉络铁(II)配合物具有一个极性空腔,其中包括一个酰胺分子(5,10,15-三[2,6-双(3,3-二甲基丁酰氧基)苯基]-20-[2-[N-乙酰基缬氨酰氧基]-6-(3、(1b) 和 5,10,15-三[2,6-双(3,3-二甲基丁酰氧基)苯基]-20-[2-[3,5-双(乙酰氨基)苯甲酰氧基]-6-(3,3-二甲基丁酰氧基)苯基]卟吩铁(II) (2b))的合成。1H NMR 光谱显示,酰胺残基位于卟啉环平面上。与 5,10,15,20-四[2,6-双(3,3-二甲基丁酰氧基)苯基]卟吩他铁(II)(4b)相比,1b 和 2b 的 O2 和 CO 结合亲和力更高,这与空腔中的局部极性有关。极性酰胺残基导致氧气解离率降低。此外,还测定了气体配体与 2b 复合物结合的热力学参数。