用Reichardt's Dye研究碳酸酯溶剂极性的经验参数E_T(30)  

Study on the Empirical Parameter of Solvent Polarity—The E_T (30) Scale of Carbonate Using Reichardt’s Dye

作　　者：吴萌[1] 吴锋[2] 栾和林[1] 陈人杰[2] 

机构地区：[1]北京矿冶研究总院,北京100044 [2]北京理工大学化工与环境学院,北京100081

出　　处：《化学学报》2005年第9期787-790,i001,共5页Acta Chimica Sinica

基　　金：国家重点基础研究发展计划(No.2002CB211800)资助项目.

摘　　要：使用2,6-二苯基-4-(2,4,6-三苯基-1-吡啶鎓)苯氧内盐染料(Reichardt’sDye)研究锂离子电池中非水电解质溶剂碳酸酯的极性,并测量极性经验参数ET(30):碳酸乙烯酯为48.6,碳酸丙烯酯为46.1,2,3-碳酸丁烯酯为45.7,碳酸二甲酯为39.0,碳酸甲乙酯为37.3,碳酸二乙酯为37.0.LiClO4加入到碳酸酯溶剂中,显色剂受到离子的盐效应影响,表现为溶液体系的ET(30)值增加,极性增大.由于溶液中粒子间的相互作用不同,环碳酸酯与链状碳酸酯极性变化趋势不同.极性大的溶剂易形成Ar—O-…solvent…Li+结构,起到缓冲作用,抑制了显色剂的酚氧基与Li+直接作用.The polarity of non-aqueous electrolyte solvent in lithium ion batteries has been studied by means of the solvatochromism of 2,6-diphenyl-4-(2,4,6-triphenyl-1-pyridium)phenolate (Reichardt's Dye), and the empirical parameter of solvent polarity-the ET(30) scale of carbonate systematically determined. The obtained ET(30) scale of ethylene carbonate is 48.6, propylene carbonate 46.1, 2,3-butylene carbonate 45.7, dimethyl carbonate 39.0, methyl ethyl carbonate 37.3, and diethyl carbonate 37.0. With the addition of lithium perchlorate to the different kinds of carbonates individually, the molecule of solvatochromic compound had an effect on halochromism. It showed that the ET(30) scale was increased, and the solvent polarity of carbonate enlarged. Cyclic carbonate and linear carbonate have different charge tendency because of interaction among particles. Because the structure of Ar-O(-...)solvent(...) Li+ is formed, there exists the damping effect in more polar solvents, which suppresses the interaction between the phenoxide moiety of Reichardt's dye and Li+.

关 键 词：经验参数 溶剂极性 LI^+ 锂离子电池 碳酸乙烯酯 碳酸丙烯酯 碳酸二甲酯 碳酸甲乙酯 碳酸二乙酯 溶液体系 相互作用 变化趋势 环碳酸酯 缓冲作用 直接作用 显色剂 二苯基 三苯基 电解质 盐效应 酚氧基 丁烯 链状 

分 类 号：O623.624[理学—有机化学]