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Vibrational characterization of poly(1‐methylpyrrole‐ co ‐squaric acid) and poly(1‐dodecylpyrrole‐ co ‐squaric acid) by enhanced Raman spectroscopy
Author(s) -
Sant'Ana Antonio Carlos,
de Siqueira Leonardo José Amaral,
Santos Paulo Sergio,
Temperini Marcia Laudelina Arruda
Publication year - 2006
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1544
Subject(s) - squaric acid , raman spectroscopy , dication , electron paramagnetic resonance , chemistry , protonation , resonance (particle physics) , raman scattering , density functional theory , photochemistry , polymer chemistry , molecule , nuclear magnetic resonance , organic chemistry , computational chemistry , ion , physics , particle physics , optics
Poly(1‐methylpyrrole‐ co ‐squaric acid) (PMPS) and poly(1‐dodecylpyrrole‐ co ‐squaric acid) (PDPS), copolymers of the class of polysquaraines, were synthesized and their structure determined by UV‐VIS‐NIR, resonance Raman and surface‐enhanced Raman scattering (SERS) and electron paramagnetic resonance (EPR) spectroscopies. The spectroscopic results led to a structure different from that proposed in the literature, having radical units localized in the protonated squarate moieties and polypyrrole dication‐like segments. The resonance Raman profiles indicate the presence of two chromospheres that are consistent with the electronic data. The Raman assignment was supported by density functional theory (DFT) calculations. Copyright © 2006 John Wiley & Sons, Ltd.