Ionic liquid analogues formed from hydrated metal salts
Ionic liquid analogues formed from hydrated metal salts
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DOI：
10.1002/chem.200400127
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发表时间：
2004-08-06
影响因子：
4.3
通讯作者：
Rasheed, RK
中科院分区：
文献类型：
--
作者：
Abbott, AP;Capper, G;Rasheed, RK
通过将氯化胆碱与六水合氯化铬（iii）混合可以形成深绿色绿色粘性液体，并且物理性质是离子液体的特征。共晶组成为1：2氯化胆碱/氯化铬。的粘度和电导率测量作为温度和组合物的函数，并解释在离子尺寸和液体空隙体积。离子液体的电化学响应的特征也在于，它表明，铬可以有效地电沉积产生无裂纹的存款。这种方法可以避免使用铬酸进行铬电镀，这将是一个重大的环境效益。这种使用水合金属盐形成离子液体的方法被证明是有效的各种其他盐与氯化胆碱的混合物。
A dark green, viscous liquid can be formed by mixing choline chloride with chromium(iii) chloride hexahydrate and the physical properties are characteristic of an ionic liquid. The eutectic composition is found to be 1:2 choline chloride/chromium chloride. The viscosity and conductivity are measured as a function of temperature and composition and explained in terms of the ion size and liquid void volume. The electrochemical response of the ionic liquid is also characterised and it is shown that chromium can be electrodeposited efficiently to yield a crack-free deposit. This approach could circumvent the use of chromic acid for chromium electroplating, which would be a major environmental benefit. This method of using hydrated metal salts to form ionic liquids is shown to be valid for a variety of other salt mixtures with choline chloride.