Abstract: The effect of additive NaCl on the melting points and the electrical conductivities researched of urea-ZnCl₂ ionic liquids system with various mole fraction of ZnCl₂ was investigated.The results show that ionic liquid trend for the variation of melting points with the mole fraction of ZnCl₂ does not change，but the melting points were decreased substantially by adding NaCl.The melting points of ionic liquid system decreased with increasing the concentration of NaCl when x (ZnCl₂)≤25%.When x (ZnCl₂) was more than 25%，however the melting points of ionic liquid system decreased with further increasing the concentration of NaCl.In addition，the effect of NaCl on the electrical conductivities of ionic liquid was closely related to the mole fraction of ZnCl₂.The electrical conductivities increased with increasing concentration of NaCl when x (ZnCl₂)＜ 22%.However，the effect of NaCl on the electrical conductivities was negligible when x (ZnCl₂)＞22%.

Key words: NaCl, urea-ZnCl₂, melting point, electrical conductivity, coordination compound

摘要： 研究了NaCl添加剂对urea-ZnCl₂低共熔离子液体熔点、电导率的影响规律。结果表明：NaCl加入不能改变离子液体熔点随组分氯化锌摩尔分数［x (ZnCl₂)］的变化规律，但可以降低离子液体的熔点。在x (ZnCl₂)≤25%的范围内，离子液体的熔点随着NaCl加入量的增加而降低；但在x (ZnCl₂)＞25%的范围内，随着NaCl浓度的进一步增加，体系的熔点逐渐升高。此外，NaCl对离子液体的电导率影响也与x (ZnCl₂)密切相关。当x (ZnCl₂)＜22%时，NaCl的加入可以改善离子液体电导率，且随NaCl浓度的增加而稍稍提高；但x (ZnCl₂)超过22%，NaCl的加入反而降低离子液体的电导率。

关键词: NaCl, urea-ZnCl₂, 熔点, 电导率, 配位化合物