Solid state NMR characterization of polyrrole : the nature of the dopant in PF6− doped films
Data(s) |
15/03/1993
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Resumo |
<sup>31</sup>P and <sup>19</sup>F solid state NMR have been used to study the nature of the PF<sub>6</sub>− anion in polypyrrole films at various levels of oxidation. It appears that the symmetric PF<sub>6</sub>− unit remains undistorted and unchanged throughout, suggesting that it is predominantly acting only as a counterion and not as a true ‘dopant’, since any distortion in the phosphorous environments would result at the very least in chemical shift anisotropy of the <sup>31</sup>P nucleus. A second set of phosphorous and fluorine resonances, which are consistent with a difluoride phosphorous compound, appeared in the films. Upon electrochemical reduction of the polymer, the undistorted PF<sub>6</sub>− anion leaves the film whereas the second phosphorous species remains. Re-oxidation of the polymer reverses the processes observed during reduction.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Elsevier S.A. |
Relação |
http://dro.deakin.edu.au/eserv/DU:30030142/forsyth-solidstatenmr-1993.pdf http://dx.doi.org/10.1016/0379-6779(93)91017-V |
Direitos |
1993, Elsevier Sequoia |
Palavras-Chave | #solid state NMR #polypyrrole #hexafluorophosphate |
Tipo |
Journal Article |