Table 2 Bands assignment attempt for Acid Orange 7 FTIR spectra 28–31
From: Use of nano gold obtained by laser ablation for SEIRA analyses of colorants
Band frequency _%T (cm-1) | Band frequency _RAS (cm-1) | Assignment attemps |
|---|---|---|
3453 (m, broad) | 3453 (m, broad) | ν OH |
3054 (m) | 3063 (m) | ν (CH) aromatic |
1665 (sh) | 1665 (sh) | ν (C = O) |
1621 (s) | 1619 (s) | ν (C = O), δ(NH), δ(naph) |
1598 (m) | 1600 (m) | ν (Ph) 8a, δ(Ph) 9a, δ(NH) |
1568 (m) | 1567 (m) | ν (Ph) 8b, δ(Ph) 3, δ(NH), ν (NN), δ(naph) |
1551 (m) | 1551 (m /w) | δ(naph), δ(naph) |
1507 (vs) | 1516 (s) | δ(NH), δ(naph), ν(CN) |
1483 (sh) | 1484 (sh) | δ(naph), ν (NN) |
1451 (m) | 1453 (m) | δ(naph) |
1416 (sh) | _ | ν (Ph) 19b, δ(Ph) 18b, ν(CN), δ(NH), δ(naph) |
1391 (w) | 1393 (m) | ν (Ph) 19b, δ(Ph) 18b, δ(NH), ν(CN), |
1398 (m) | 1402 (m) | ν (Ph) 19b, δ(Ph) 18b, δ(NH), ν(CN) |
1338 (sh) | 1338 (sh) | δ(naph), δ(Ph), ν (NN) |
1303 (m/w) | 1303 (m/w) | ν (Ph) 8b, δ(Ph) 3, δ(naph) |
1249 (m) | 1254 (m) | ν (NN), δ(NH), δ(naph), δ(Ph) 9a |
1181 | 1178 | νas (SO3−) |
1124 | 1122 | νs (SO3−), δ(Ph)1 |
1038 (vs) | 1035 (vs) | νs (SO3−), δ(Ph)1 |
1006 (s) | 1010 (s) | δ(Ph) 18a |
986 (m) | 986 (s) | Â |