Table 1 FTIR assignments for 4-amino salicylic acid and 4ASA-nanocomposite[23, 24]
Assignments | 4-amino salicylic acid* | 4ASA-nanocomposite* |
|---|---|---|
ν as (N-H) | 3490 | Band for N-H symmetry and antisymmetry are overlapped with O-H stretching at 3345 |
ν s (N-H) | 3381 | |
ν (O-H) in the layer; H 2 O | - | |
ν (C-C) | 1649, 1519 | 1502 |
ν(C = O) in COOH | 1609, 764 | - |
ν (O-H) ring | 3020,1283, 1163 | 1162 |
δ b (CH), in plane bends | 1220, 1109, 813 | 1200, 1027, 827 |
Stretching (C-H) | 813, 717 | 827, 738 |
ν as (COO - ) | - | 1549 |
ν s (COO - ) | - | 1372 |