753139.fig.001a
(a)
753139.fig.001b
(b)
753139.fig.001c
(c)
753139.fig.001d
(d)
Figure 1: Optimized structures using WB97XD/6-31++G(d,p) of (a) ethylene glycol (EG), (b) diethylene glycol (DEG), (c) triethylene glycol (TEG), and (d) dipropylene glycol molecule (DPG) (colour legend: red = oxygen, black = carbon, and whitish grey = hydrogen).