. 2018 Sep 7;3(9):10866–10876. doi: 10.1021/acsomega.8b01447

Table 1. Possible Functional Groups and the Corresponding Wavenumber (cm^–1) of Ionic Liquid-Extracted Lignin (ILL) at Various Extraction Temperatures (T) after 4 h Treatment.

		assigned functional groups with their wavenumber (cm^–1)
ILs used	T (°C)	OH	methylene C–H	benzene skeleton	aromatic C–H	C–O
[DIPEA][Ac]	80	3363	2978	1555	1264	1013
	100	3341	2920	1552	1254	1013
	120	3343	2924	1564	1264	1013
[DIPEA][B]	120	3357	2914	1557	1250	1023
[DIPEA][O]	80	3374	2917	1552	1257	1013
	100	3343	2924	1578	1255	1015
	120	3343	2917	1567	1272	1013
[DIPEA][P]	80	3374	2937	1567	1222	1013
	100	3353	2935	1568	1213	1013
	120	3363	2917	1574	1220	1013

Table 1. Possible Functional Groups and the Corresponding Wavenumber (cm–1) of Ionic Liquid-Extracted Lignin (ILL) at Various Extraction Temperatures (T) after 4 h Treatment.