Study of vibrational spectra of polyaniline doped with sulfuric acid and phosphoric acid

被引:17
作者
Arora, M
Luthra, V
Singh, R
Gupta, SK
机构
[1] Natl Phys Lab, New Delhi 110012, India
[2] Univ Delhi, Gargi Coll, Dept Phys, New Delhi 1110049, India
关键词
vibrational spectra; polyaniline; sulfuric acid; phosphoric acid;
D O I
10.1385/ABAB:96:1-3:173
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Vibrational spectra of insulator emeraldine base (EB) form of polyaniline and electrical conductive sulfuric acid- and phosphoric acid-doped emeraldine salts (ES) were studied in the region of 4000-400 cm(-1) at ambient temperature by Fourier transform infrared spectroscopy. Infrared transmittance spectra of EB and ES were investigated to understand the bonding behavior of different organic and inorganic groups present in the polymeric chains and their structural variations on protonation by sulfate or phosphate ion inclusion in the polymer salt network. These studies revealed the para-coupling of deformed disubstituted benzenoid (B) and quinoid (Q) rings with ends capped predominantly by (B4Q1) units. The deformation of B and Q rings was confirmed by the appearance of many weak bands, very weak bands, and satellite structures in strong transmittance peaks of polymeric chain-constituting groups. Protonation takes place at the nitrogen sites of Q rings and forms semiquinone radical ions in ES. The vibrational bands pertaining to B rings, Q rings, B4Q1 units, semiquinone segment, sulfate ions, and phosphate ions were observed and assigned from these measurements. The shift in peak position of some bands with gain or loss in intensity and appearance of some new bands were observed in sulfuric acid- and phosphoric acid-doped ES spectra. These variations are attributed to the formation of new structural groups in ES on protonation and a change in crystalline field by sulfate and phosphate ion doping for crosslinking the polymeric chains.
引用
收藏
页码:173 / 181
页数:9
相关论文
共 19 条
[1]  
Bairachnyi BI, 1999, RUSS J APPL CHEM+, V72, P225
[2]   Vibrational analysis of polyaniline: A model compound approach [J].
Boyer, MI ;
Quillard, S ;
Rebourt, E ;
Louarn, G ;
Buisson, JP ;
Monkman, A ;
Lefrant, S .
JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (38) :7382-7392
[3]  
BREDAS JL, 1994, ORGANIC MAT ELECT
[4]  
CANTU ML, 1999, J ELECTROCHEM SOC, V146, P2029
[5]  
da Silva JEP, 1999, ELECTROCHIM ACTA, V44, P1887
[6]   All polymeric solid state electrochromic devices [J].
De Paoli, MA ;
Casalbore-Miceli, G ;
Girotto, EM ;
Gazotti, WA .
ELECTROCHIMICA ACTA, 1999, 44 (18) :2983-2991
[7]  
Ellis J. R., 1986, HDB CONDUCTING POLYM, P501
[8]   A solid-state electrochromic device based on complementary polypyrrole/polythiophene derivatives and an elastomeric electrolyte [J].
W.A. Gazotti ;
M.-A. De Paoli ;
G. Casalbore-Miceli ;
A. Geri ;
G. Zotti .
Journal of Applied Electrochemistry, 1999, 29 (6) :757-761
[9]  
GENIES EM, 1985, MOL CRYST LIQ CRYST, V121, P247
[10]   Acid doping of polyaniline: Spectroscopic and electrochemical studies [J].
Hatchett, DW ;
Josowicz, M ;
Janata, J .
JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (50) :10992-10998