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. 2018 Dec 10;8(71):40765–40777. doi: 10.1039/c8ra08579j

Assignment of FT-IR signals of kraft lignin and Indulin AT.

Wavenumber [cm−1] Peak location [cm−1] Assignment of IR absorption bands
3411 3460–3412 O–H stretching
2935 3000–2930 C–H stretch in methyl and methylene groups
1707 1738–1709 C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretch in unconjugated carbonyl groups
1599 1605–1593 Aromatic skeleton vibrations (S, G) and C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching
1514 1514 C Created by potrace 1.16, written by Peter Selinger 2001-2019 C stretch of aromatic skeletal (lignin)
1460 1470–1370 C–H deformation (lignin)
1425 1430–1422 Aromatic skeleton vibrations combined with C–H in plane deformation
1268 1270–1266 G-ring plus C + O stretching
1219 1230–1221 C–C, C–O and C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching (G)
1149 1163 C–O stretch [
1032 1035–1030 Aromatic C–H in-plane deformation (G, S), C–O deformation in primary alcohols, C–H stretching (unconjugated)
856 858–853 C–H out of plane (G-units)
816 832–817 C–H out of plane (G-units)