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请教一句NMR的英文

核磁共振技术(NMR)

  • 请教熟悉NMR的朋友,
    1H NMR chemical shifts are reported in ppm relative to SiMe4 (δ=0) and referenced internally with respect to the protio solvent impurity. 13C NMR spectra were referenced internally with respect to the solvent resonance. 31P NMR spectra were referenced using H3PO4 (δ=0) as an external standard.

    这一段说的是什么呀?多谢。

    原文在这里:http://www.automm.net/articlite/info/1135840755.html
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    http://www.automm.net/
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  • 第2楼2005/12/30

    NMR中定标问题,例如里面所说的做31P-NMR时可用H3PO4做外标,它的化学位移是0,那么NMR谱图中其它峰的化学位移也就可知了

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  • 第3楼2005/12/31

    1. “referenced internally with respect to the protio solvent impurity”: 对氘代氯仿溶剂, 其 solvent impurity 指的是 7.24 ppm 的 CHCl3 峰.
    2. “13C NMR spectra were referenced internally with respect to the solvent resonance”: 对氘代氯仿溶剂, 其 solvent resonance 指的是 CDCl3 7 那个三重峰的的中间峰 (77.00 ppm).

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