RESONANCE RAMAN-SPECTROSCOPIC STUDY OF POLYPYRROLE IN CUZSM-5

Citation
Jr. Blanking et al., RESONANCE RAMAN-SPECTROSCOPIC STUDY OF POLYPYRROLE IN CUZSM-5, Journal of Raman spectroscopy, 24(8), 1993, pp. 523-526
Citations number
35
Categorie Soggetti
Spectroscopy
ISSN journal
03770486
Volume
24
Issue
8
Year of publication
1993
Pages
523 - 526
Database
ISI
SICI code
0377-0486(1993)24:8<523:RRSOPI>2.0.ZU;2-#
Abstract
Raman spectroscopy was employed to study the polymerization of pyrrole over a selection of copper-exchanged ZSM-5 zeolites. No polymerizatio n occurred on catalysts of low copper content, which suggested that a critical concentration of copper(II) cations was required for reaction . On ZSM-5 materials with low Si/Al ratios, bands were detected which were characteristic of partially oxidized polypyrrole and monomeric py rrole. The polymer was degraded in the presence of residual oxygen. It was shown that the polymer incorporated both aromatic- and quinoidal- type structures. Further, resonance Raman spectroscopy suggested that the charge carrier present in the oxidized polymer was associated with the quinoid arrangement.