Electrochemistry and Spectral Characterization of Oxidized and Reduced (TPPBr<i><sub>x</sub></i>)FeCl Where TPPBr<i><sub>x</sub></i> Is the Dianion of β-Brominated-Pyrrole Tetraphenylporphyrin and <i>x</i> Varies from 0 to 8
作者:Pietro Tagliatesta、Jun Li、Marie Autret、Eric Van Caemelbecke、Anne Villard、Francis D'Souza、Karl M. Kadish
DOI:10.1021/ic960148c
日期:1996.1.1
potential limits of the solvent. The two oxidations occur at the conjugated porphyrin pi ring system, and DeltaE(1/2) between these two electrode reactions increases as the molecule becomes more distorted. The overall reduction of each compound involves the stepwise electrogeneration omicronf an iron(II), iron(I), and iron(I) pi anionradical. An equilibrium between chloride-bound and chloride-free iron(II)
在含四正丁基高氯酸铵(PhCN)的PhCN中检查了(TPPBr(x)())FeCl(TPPBr(x)()是β-溴-吡咯四苯基卟啉的二价阴离子,x = 0-8)的电化学和光谱电化学TBAP)作为支持电解质。每种化合物都会经历两次可逆至准可逆的单电子氧化,并在溶剂的电势极限内进行三到四次还原。两种氧化作用发生在共轭卟啉pi环系统上,并且随着分子变得更扭曲,这两个电极反应之间的DeltaE(1/2)增加。每种化合物的总还原涉及逐步生成铁(II),铁(I)和铁(I)π阴离子自由基。观察到卟啉的氯离子结合形式和无氯离子形式的铁(II)之间的平衡,对于x> 5的化合物,阴离子配体的缔合是有利的。单还原(TPPBr(x)())FeCl(x = 0 x = 6)在CH(2)Cl(2)中同时形成单-和双-CO加合物。对于(TPPBr(7))FeCl仅观察到一元一氧化碳加成物,并且一氧化碳与(TPPBr(8)