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| - On the Origin of the So-Called Nucleation Loop during Electropolymerization ofConducting Polymers
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| - During the potentiodynamic preparation of conducting polymers, cyclic voltammograms of many π-conjugatedmonomers and oligomers often show a marked crossing or loop effect. The so-called “nucleation loop” of thefirst cycle has been ascribed to the nucleation process requiring an activation energy provided by anoverpotential. This paper presents cyclic voltammograms of π-systems with trace crossing as well as loopeffects that suggest that the homogeneous formation of oligomeric redoxactive follow-up products from thestarting species is responsible for this occurrence. As the investigated species are typical starting componentsof resulting oligomers or polymers, all these findings are evidence that similar mechanisms also hold for theformation of many other classical polymers with a “nucleation loop” like polypyrrole, and that the true reasonfor the nucleation loop is the comproportionation reaction between an oligomeric follow-up product and thestarting “monomer”.
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