. 2013 Apr 20;7:72. doi: 10.1186/1752-153X-7-72

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; H₂O	-
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

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