N,N'-二乙基硫脲的制备及性质

以十六烷基三甲基溴化铵为催化剂,乙胺和二硫化碳反应制备N,N'-二乙基硫脲,收率达94.6%,与传统工艺相比,综合效益明显提高。通过FT-IR、XRD和TG-DTA对N,N'-二乙基硫脲进行表征,揭示N,N'-二乙基硫脲的微观结构和内在规律性。FT-IR揭示N,N'-二乙基硫脲分子内部各元素之间的化学键键型,N,N'-二乙基硫脲为脂肪仲胺。XRD从晶胞参数和晶面指数等晶体学数据,完成N,N'-二乙基硫脲物相组成和结构的定性鉴定。TG-DTA检测N,N'-二乙基硫脲的质量变化与热效应,TG-DTA结果表明,85.3℃和261.5℃存在两个吸收峰,分别为N,N'-二乙基硫脲的相变峰和分解峰,N,N'-二乙基硫脲分解温度偏高。

Preparation of N,N'-diethylthiourea and its properties

N,N'-diethylthiourea (DETU) was synthesized from ethylamine and carbon disulfide using hexadecyl trimethyl ammonium bromide as the catalyst, with yield of 94.6%.The as-synthesized DETU was characterized by FT-IR,XRD and TG-DTA to reveal its micro-structure and intrinsic regularity.FT-IR results revealed types of chemical bonds in DETU molecule and that DETU was an aliphatic secondary amine.XRD results determined phase composition and structure of DETU by crystallographic data such as cell parameters and crystal face index.TG-DTA results showed that there were two absorption peak at 85.3 ℃ and 261.5 ℃,corresponding to phase transition and decomposition of DETU,respectively.The decomposition temperature of DETU was excessively high.