Redox-active ligands porphyrins

Phenylenediamine Polar crystal Polyaniline Porphyrin Proton-coupled electron transfer Quinonediimine Redox mediator Redox-active ligand Redox-active... 

Metalloporphyrins, characterized by a redox-active transitional metal coordinated to a cyclic porphyrin core ligand, mitigate oxidative/nitrosative stress in biological systems. Side-chain substitutions tune redox properties of metalloporphyrins to act as potent superoxide dismutase mimetics, peroxynitrite decomposition catalysts, and redox regulators of transcription factor function. Metalloporphyrins are efficacious in AD models [538],... 

The main interest with porphyrins, however, lies not in the effects of variations in the conjugated n system but in the influence of various metal ions in the porphyrin cavity on the redox activity of the porphyrin ligands. With transition-metal ions both conjugative and inductive effects can be expected, and regularities in the oxidation and reduction potentials, as well as the differences between them, should yield direct information on the nature of the metal-porphyrin interactions. 

The electropolymerization method of functional monomers has proved successful in many cases, in particular to incorporate various ligands and their metallic complexes, like salen [66,245], porphyrin [246], diphosphine [247], pyridine [71,80,248,249], crown ether [250,251], metallofullerene [252], tetraazacyclotetradecane [253], or Prussian blue type [254] in a conjugated organic material like PPy, PTh, or PANE Thick films are likely to be obtained provided that the polymer is redox active at the deposition potential due to this, Zotti et al. demonstrated that 5,5 -bis(3,4-(ethylenedioxy)thien-2-yl)-2,2 -bipyridine could be electropolymerized when complexed by iron and ruthenium, but not in the case of complexation by nickel or copper [71]. 

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