Abstract
The hypochromic effect of bromocresol green (BCG) resulted from long-chained imidazolium ionic liquids was investigated. The hypochromic effect may be caused by the formation of the neutral complex [Cnmim]2+[BCG]2−via electrostatic interaction and hydrophobic interaction. Based on the spectral characteristics, a new method for determination of long-chained imidazolium ionic liquids is developed. The proposed method can be performed using a UV-vis spectrophotometer, at the optimum λmin. Beer's law is obeyed in the concentration range of 0.004–0.04 mmol L−1 for [C14mim]Br and [C16mim]Cl, and the detection limits are 0.0011 and 0.00095 mmol L−1 for [C14mim]Br and [C16mim]Cl, respectively. Meanwhile, precision, accuracy and tolerance are also very good. The method is fast, economical and does not require organic solvents; it can be applied for determination of long-chained imidazolium ionic liquids.
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