Abstract
The stability constants relevant to the formation of amine/ p-nitrophenol ion pairs have been determined in [bmim][BF 4] solution, in the presence of butylamine, piperidine, and triethylamine, by using spectrophotometric measurements. In order to evaluate how the ion pair stability is affected by ionic liquid structure, piperidine has been chosen as model amine for studies in [bmim][PF 6], [bmim][NTf 2], [bm 2im][NTf 2] and in several [bmim][BF 4]/1,4-dioxane binary mixtures. Data obtained in ionic liquid solutions have been compared with those previously reported in conventional organic solvents.
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