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Table 1 FTIR assignments for 4-amino salicylic acid and 4ASA-nanocomposite[23, 24]

From: Sustained release formulation of an anti-tuberculosis drug based on para-amino salicylic acid-zinc layered hydroxide nanocomposite

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
  1. *unit for the given number is the wavenumber (cm-1).