Abstract
Cyclic voltammetry (CV), density functional theory (DFT) calculations, and atoms in molecules (AIM) analyses were performed to investigate the hydrogen bonding in dopamine-ethanol and dopamine hydrochloride-ethanol mixtures. CV results show that the anodic/cathodic peak potential of dopamine hydrochloride in ethanol is influenced by the hydrogen bonding formed in the mixtures. The DFT and AIM results indicate that the hydrogen atoms of NH3+ in dopamine hydrochloride-ethanol system are easier to interact with ethanol by hydrogen bonding than those in dopamine-ethanol system. On the contrary, the hydrogen atoms on phenolic hydroxyl groups can form stronger hydrogen bonding with ethanol in dopamine-ethanol system than in dopamine hydrochloride-ethanol system.
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