Table 1.

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

Assignments	4-amino salicylic acid*	4ASA-nanocomposite*
νas (N-H)	3490	Band for N-H symmetry and antisymmetry are overlapped with O-H stretching at 3345
νs (N-H)	3381
ν (O-H) in the layer; H2O	-
ν (C-C)	1649, 1519	1502
ν(C = O) in COOH	1609, 764	-
ν (O-H) ring	3020,1283, 1163	1162
δb (CH), in plane bends	1220, 1109, 813	1200, 1027, 827
Stretching (C-H)	813, 717	827, 738
νas (COO-)	-	1549
νs (COO-)	-	1372

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