Document Detail


Structure Dependence of Charged States in "Linear" Polyaniline as Studied by In Situ ATR-FTIR Spectroelectrochemistry.
MedLine Citation:
PMID:  22409155     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The electrochemical doping of emeraldine salt and emeraldine bases with different average molecular weights was studied by in situ Fourier transform infrared (FTIR) spectroelectro¬chemistry using attenuated total reflection (ATR) technique. The formation and stabilisation of charge carriers in polyaniline during p-doping was followed in dependence of the chain branching. The potential dependence of the IR bands during the oxidation of the polymer clearly demonstrates the formation of the different charged polymer structures (π-dimers, polarons and bipolarons). It is shown that IR bands usually attributed to a semiquinoid polaron lattice correspond in fact to doubly charged species, π-dimers, which are face-to-face complexes of two polarons. Bands corresponding exclusively to polarons have been identified at 1266, 1033 and 1010 cm-1 suggesting that polarons are predominantly stabilized on the linear segments near the polymer branches by phenazine.
Authors:
Andrea Kellenberger; Evgenia Dmitrieva; Lothar Dunsch
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-12
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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