利用先進核磁共振技術來提升有機化合物的解析度

The use of advanced nuclear magnetic resonance technologies to enhance the spectral resolution of organic compounds

楊雅絜(YA-JIE YANG)

指導教授 ： 賈緒威

中原大學/理學院/化學系/碩士(2022年)

https://doi.org/10.6840/cycu202201682

摘要

分析有機化合物時，常會碰到氫譜訊號有重疊之情形，且甚至於二維圖譜也難以解析。雖然這些問題在高磁場核磁共振儀便可解決，但如何在資源有限 (亦即僅有較低磁場核磁共振儀)，利用先進之核磁共振技術，如選擇性脈衝、溶劑效應、添加位移試劑及非均勻抽樣等，來解決上述之困難，便是本論文所要挑戰的目標。本論文聚焦於如何辨識每個氫原子核所對應之化學位移。
以醇類來說，從甲醇至己醇的氫譜上，可發現距離末端甲基最近之兩個氫核化學位移位置會顛倒；而在碳譜上也有相似之規律。將這些規律整理成一張萬用表，在依據這萬用表應用在碳數更多之同系物上。因此，日後能解析的樣品就更為廣泛。對於多醣聚合物亦或是具長碳鏈之各式官能基的有機物，便能輕鬆解析其樣品。

關鍵字

先進核磁共振技術

並列摘要

When analyzing 1H spectra of organic compounds, we often encounter overlapped signals in the 1H NMR spectrum, and even the two-dimensional spectrum is difficult to resolve. In this thesis, we aim to solve the above-mentioned difficulties by using advanced NMR techniques (e.g., selective pulses, solvent effects, added shift reagents, and Non-Uniform Sampling). Therefore, this thesis focuses on the analysis of the chemical shifts that really correspond to the hydrogen nucleus.
In the case of alcohols, it is found that the positions of the two nearest hydrogen nuclei to the terminal methyl group are reversed in the hydrogen spectra from methanol to hexanol, and there is a similar pattern in the 13C NMR. These finding can be compiled into a multimeter that can be applied to congeners with more carbon. Accordingly, we can analyze a wider range of samples in the future, from polysaccharide polymers to organic materials with long carbon chains.

並列關鍵字

advanced nuclear magnetic resonance technologies

參考文獻

[1] Basic One- and Two-Dimensional NMR Spectroscopy Horst Friebolin

[2] Physical Chemistry Principles and applications in biological sciences fourth edition

[3] Kiraly P.; Kern N.; Plesniak M. P.; Nilsson M.; Procter D. J.; Morris G. A. and Adams R. W. Angew. Chem. Int. Ed. 2021, 60 666-669

[4] Mobli M.; Hoch J. C. Progress in Nuclear Magnetic Resonance Spectroscopy 83 (2014) 21-41

[5] Nuclear Magnetic Spectroscopy Robin K Harris