Table 1. FTIR-ATR Peaks and Their Ascription in aq (3.017 m MDEA + 1.008 m 2-MPZ) at 313.2 K.

Sl. no.	wavenumber (cm–1)	attribution
1	839	C–NH2 twisting for 2-MPZ
2	1079	protonation of MDEA to form MDEAH+
3	1287	N–C stretching vibration of 2-MPZ carbamate
4	1359	HCO3–
5	1419	asymmetric and symmetric vibrations of COO– of 2-MPZ monocarbamate
6	1467 and 1577	asymmetric and symmetric stretching of COO–