Oxidation of
<i>N</i>
‐(4‐Chlorophenyl)‐
<i>N′</i>
‐hydroxyguanidine to
<i>N</i>
‐(4‐Chlorophenyl)urea and Nitric Oxide by Photoexcited Iron Porphyrins
Photochemical excitation (λ > 350 nm) of chloro[meso-tetrakis(2,6-dichlorophenyl)porphyrin]iron(III) [FeIII(TDCPP)Cl] and chloro[meso-tetra(α,α,α,α-pivalamidophenyl)porphyrin]iron(III) [FeIII(TpivPP)Cl] induces the oxidation of coordinated N-(4-chlorophenyl)-N′-hydroxyguanidine (1) by molecular oxygen, to give iminoxyl radicals and the FeII(O2) [or FeIII(O2·)] adduct. This complex can be accumulated
Mechanism of Reduction of Ferric Porphyrins by Sulfide: Identification of a Low Spin Fe<sup>III</sup>–SH Intermediate
作者:Kaustuv Mittra、Asmita Singha、Abhishek Dey
DOI:10.1021/acs.inorgchem.6b02878
日期:2017.4.3
The reaction of FeIII porphyrin complexes bearing distal hydrogen bonding residues with sulfide/hydrosulfide is kinetically monitored to reveal the presence of an intermediate and a kH/kD of 3.0. This intermediate is trapped at lowtemperatures and investigated with resonance Raman and electron paramagnetic resonance spectroscopy. The results, corroborated by density functional theory calculations
动力学监测带有远端氢键残基的Fe III卟啉配合物与硫化物/氢硫化物的反应,以揭示中间体的存在和k H / k D为3.0。该中间体在低温下被捕获,并通过共振拉曼光谱和电子顺磁共振光谱进行研究。由密度泛函理论计算所证实的结果表明,该物种是六配位的低自旋氢硫化物结合的三价铁卟啉。Fe III的均相裂解发现导致金属亚铁卟啉和氢硫化物自由基(被5,5-二甲基-1-吡咯烷酮-N-氧化物捕获)的-SH键是反应的总体速率决定步骤。
Vibrational Stark Spectroscopy of NO Bound to Heme: Effects of Protein Electrostatic Fields on the NO Stretch Frequency
作者:Eun Sun Park、Melissa R. Thomas、Steven G. Boxer
DOI:10.1021/ja0014741
日期:2000.12.1
the organized electrostatic matrix of a protein, for example, by mutating amino acid residues near the vibration whose frequency is probed. We report vibrational Stark effect measurements for NO bound to several distal pocket mutants of myoglobin, (Val68Asp, Val68Asn, Val68Glu, and His64Val). These mutations were designed to perturb the electrostatic field near the NO bound to the heme iron. The magnitude
振动斯塔克效应测量外部电场对分子振动 (IR) 光谱的影响。该技术提供了关于振动峰值位置对电场的灵敏度的定量信息。这种校准可用于评估由蛋白质有组织的静电基质中局部电场变化引起的振动频率的变化,例如,通过突变频率被探测的振动附近的氨基酸残基。我们报告了 NO 与几种肌红蛋白远端口袋突变体(Val68Asp、Val68Asn、Val68Glu 和 His64Val)结合的振动斯塔克效应测量。这些突变旨在扰乱与血红素铁结合的 NO 附近的静电场。偶极矩变化的幅度,|Δμ|,
Oxygenation patterns for substituted meso-tetraphenylporphyrin complexes of iron(II). Spectroscopic detection of dioxygen complexes in the absence of amines
作者:Lechoslaw Latos-Grazynski、Ru Jen Cheng、Gerd N. La Mar、Alan L. Balch