Structural changes in conducting form of polyaniline upon ring sulfonation as deduced by near infrared resonance Raman spectroscopy

被引：94

作者：

Niaura, G ^{[1
]}

Mazeikiene, R ^{[1
]}

Malinauskas, A ^{[1
]}

机构：

[1] Inst Chem, LT-2600 Vilnius, Lithuania

来源：

SYNTHETIC METALS | 2004年 / 145卷 / 2-3期

关键词：

resonance Raman spectroscopy; near infrared; sulfonated polyaniline; self doped; polaron; deuteration;

D O I：

10.1016/j.synthmet.2004.04.010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Structure of conducting form of ring-sulfonated polyaniline (SPAN) and polyaniline (PANI) has been studied by resonance near-infrared fourier-transform Raman (FT-Raman) spectroscopy. Isotopic H/D substitution on nitrogen atoms was used to facilitate assignments of the FT-Raman modes. Comparative spectroscopy investigations showed that ring-sulfonation affects thepolaronic nu(s)(Csimilar toN(+)) vibrational bands in the 1300-1400 cm(-1) region. The higher frequency peak at similar to1357 cm(-1) considerably upshifts in frequency, while the lower frequency component at similar to 1325 cm(-1) decreases in relative intensity, indicating an increase of the charge localization at nitrogen atoms due to the presence of -SO3- groups. Based on the pronounced blue shift (26 cm(-1)) due to the deuteration of nitrogen sites, the characteristic peak at 1377 cm(-1) of PANI film immersed in Na2SO4 solution was assigned to the highly localized symmetric Csimilar toN(+) vibrational mode. It was shown that well-defined N-D bending vibration in the vicinity of 1068 cm(-1) shifts upward by 4 cm(-1) upon ring sulfonation. Spectroscopic data revealed that influence of water on the chain conformation is less pronounced for the conducting form of SPAN film as compared with PANI. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：105 / 112

页数：8

共 45 条

[1] Resonant Raman identification of the polaronic organization in PANI [J].