| 19F NMR化学位移经验公式的影响因素 |
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| 引用本文： | 李燕,胡浩斌,王春林.19F NMR化学位移经验公式的影响因素[J].光谱实验室,2012,29(1):232-235. |
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| 作者姓名： | 李燕 胡浩斌 王春林 |
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| 作者单位： | 1. 陇东学院化学化工学院 745000
2. 陇东学院科技处 甘肃省庆阳745000 |
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| 摘 要： | 化学位移是核磁共振技术的重要参数,目前对1H NMR、13C NMR已提出一系列估算化学位移的经验公式,但19F NMR化学位移规律研究报道则较少,以δ=B+∑△i+C化学位移通式为基础,分析屏蔽常数对化学位移的作用,并针对19F原子,分析了氟的电子云密度、立体效应、溶剂效应、氢键、标准、浓度和温度等影响因素,对19F NMR化学位移经验公式的提出提供理论依据。
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| 关 键 词： | 化学位移 19氟核磁共振 影响因素 公式 |
Influence Factors of the Empirical Formulas of 19F NMR Chemical Shift |
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| LI Yan
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HU Hao-Bin
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WANG Chun-Lin.Influence Factors of the Empirical Formulas of 19F NMR Chemical Shift[J].Chinese Journal of Spectroscopy Laboratory,2012,29(1):232-235. |
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| Authors: | LI Yan HU Hao-Bin WANG Chun-Lin |
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| Institution: | a (Chemistry and Chemical Engineering Department,Longdong University,Qingyang,Gunsu 745000,P.R.China) a(Science and Technology Department.Longdong University,Qingyang,Gansu 745000,P.R.China) |
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| Abstract: | Chemical shift is an important parameter in nuclear magnetic resonance technology. Currently,a series of empirical formulas for estimating chemical shift were reported on1H NMR, 13C NMR,but that on 19F NMR were less.On the basis of the formula:δ= B+Σ△i+C,the effect of the screening constant on chemical shift was analyzed.Aimed at 19F atom,the effects of the electron cloud density,the stereo effect,the solvent effect,the hydrogen bond,the standard,concentration and the temperature of fluorine were analyzed.The method provides theoretical basis for the empirical formulas of 19F NMR chemical shift. |
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| Keywords: | Chemical Shift 19F NMR Influence Factors Formulas |
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