FIGURE 3 Characteristics analysis of multimer absorbents and complexes. (a) and (b), 1H-NMR of DBU-2EG multimer absorbent and DBU-2EG-4H2S complexes, respectively. (c) and (d), TG-DTA curves of DBU-2EG multimer absorbent and DBU-2EG-4H2S complexes, respectively. (e), Effect of temperature on the viscosity of DBU-2EG multimer absorbent.