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只是总结了每种氘代试剂中的溶剂峰 而本资料总结了10余种实验室常用氘代溶剂中 上百种有机杂质 的氢谱、碳谱化学位移 氢谱:氘代氯仿(CDCl3,简称氘仿或氘氯)一般以 7.26 ppm的单峰 定标;如果含有四甲基硅烷(TMS)内标则以 0.00 ppm的单峰 定标(除了氯仿外其他氘代溶剂都不会加入TMS),具体选哪个看课题组习惯。 测试核磁时,所用溶剂分子中的氢都应被氘取代,但难免有残余,这样就会产生溶剂峰;除了残存的质子峰外,溶剂中有时会有微量的H2O而产生水峰.
常用氘代溶剂和杂质峰在 1H 谱中的化学位移 溶剂 溶剂峰 水峰 乙酸 丙酮 乙腈 苯 — — — — — — — CH3 叔丁醇 OH CCH3 叔丁基甲醚 OCH3 氯仿 环己烷 1,2-二氯甲烷 二氯甲烷 — — — — CH3 (t) 乙醚 CH2 (q) CH 二甲基甲酰胺 CH3 CH3 二甲基亚砜 二氧杂环 — — 3.48 8.02 2.96. 常见的氘代试剂、溶剂的核磁氢谱、碳谱出峰位置一览表 NMR的氘代试剂、以及不同氘代试剂中的水峰位置都必不可少,所以有必要人手一份,抓紧下载了哦。 在核磁共振(NMR)氢谱分析中,了解常见溶剂和杂质的化学位移对于正确解析谱图至关重要。 以下表格列出了一些常用的氘代溶剂以及可能遇到的杂质在氢谱中的化学位移值。
NMR是有机化学中最常用的分析手段,使用氘代试剂是必不可少的。 在解析谱图时,熟知其中的溶剂峰和水峰是一项基本技能。
HNMR是有机化学中最常用的分析手段,使用氘代试剂是必不可少的,而记住氘代试剂峰和水峰对我们解析谱图有很大的帮助,下面我们看一看几种常用氘代试剂在HNMR中的出峰位置。 CDCl₃(氘代氯仿):溶剂峰通常出现在δ = 77.16 ppm(主要峰)和δ = 76.84 ppm(次要峰)。 这两个峰是由于氯仿分子中不同碳原子的化学环境不同而产生的。 它们的主要作用是消除溶剂峰对实验结果的干扰。 例如,在氢谱(¹H NMR)中,氘代试剂如氘代氯仿(CDCl₃)的氢会被完全去偶,不出峰。
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