Preparation and characterisation of electrodes modified with iron porphyrins immobilised in a poly(amino acid) matrix
作者:Martin Devenney、James Grimshaw、Jadwiga Trocha-Grimshaw
DOI:10.1039/a706863h
日期:——
Controlled reaction of 1-(3-aminopropyl)imidazole with poly(γ-ethyl L-glutamate) leads to conversion of some side-chain ester groups to amides. The functionalised polymer is characterised by 1H NMR spectroscopy. Imidazole complexes have been formed between this functionalised polymer and 5,10,15,20-tetraphenylporphyrin iron(III) chloride and also deuteroporphyrin-IX dimethyl ester iron(III) chloride. Films of the polymer-porphyrin complexes formed on platinum and on tin oxide coated glass show reversible redox activity in acetonitrile and in aqueous electrolytes. Both redox states of iron are characterised as bis-imidazole ligated by their UV–VIS spectra. The influence of the degree of polymerisation of the starting poly(γ-ethyl L-glutamate), the composition of the aqueous electrolyte and the oxidation state of the iron centre on the stability of the hydrogel films towards redox cycling is examined.
1-(3-aminopropyl)imidazole 与聚(γ-乙基 L-谷氨酸)发生受控反应,导致一些侧链酯基转化为酰胺。这种功能化聚合物通过 1H NMR 光谱进行表征。这种功能化聚合物与 5,10,15,20-四苯基卟啉氯化铁(III)以及氘代卟啉-IX 二甲酯氯化铁(III)之间形成了咪唑复合物。在铂和氧化锡涂层玻璃上形成的聚合物-卟啉复合物薄膜在乙腈和水性电解质中显示出可逆的氧化还原活性。这两种氧化还原状态的铁都被紫外-可见光谱表征为双咪唑配位。研究还考察了起始聚(γ-乙基 L-谷氨酸)的聚合度、水性电解质的成分和铁中心的氧化状态对水凝胶薄膜氧化还原循环稳定性的影响。