Table 2.
Comparison between the absorption bands of ATR spectrum of 0.1 M [EMMIM]Tf2N in acetonitrile and external reflection FTIR spectra of PEDOT in [EMMIM]Tf2N.
| Wavenumber (cm−1) | Assignment | |
| [EMIM]Tf2N] | PEDOT | |
| 3186 | 3186 (n) | ν(C-H) ring [34] |
| 3151 | 3151 (n) | ν(C-H) ring [34] |
| 2993 | ν(C-H) alkyl | |
| 2946 | ν(C-H) alkyl [34] | |
| 1589 | ν(C=C) ring [35] | |
| 1543 | ν(CH-N) [35] | |
| 1529 (p) | Doping induced band [17] | |
| 1469 (n) | ν(C=C) [17,19] | |
| 1437 (n) | ν(C=C) [19] | |
| 1415 (p) | Doping induced band | |
| 1381 (n) | ν(C-C) [19] | |
| 1349 | νas(SO2) [34] | |
| 1334 | 1339 (n) | νas(SO2) [34] |
| 1296 (p) | νinterring [17,19] | |
| 1226 | 1222 (n) | νs(CF3) [34] |
| 1195 | νas(CF3) [34] | |
| 1176 (p) | ν(C=C), ν(COROC) [19] | |
| 1141 | 1132 (p) | νs(SO2) [34] |
| 1070 (p) | ν(COROC) [17,19] | |
| 1061 | νas(SNS) [34] | |
| 1045 (p) | ν(COROC) [17,19] | |
(n) Negative oriented band; (p) positive oriented band; ν: stretching; s; symmetric; as: asymmetric; COROC: ethylenedioxy group.