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~(13)C 核磁共振波谱法可以直接测定分子中骨架碳原子的分布,并可藉助于炭谱和氢谱图中的脂肪区域直接算出Hs/Cs 值,故此它能提供更加精确的结构信息。但是~(13)C核灵敏度低,各~(13)C 核的自旋晶格弛予时间不同,在进行宽带去偶时~(13)C 核的NOE值不同,致使炭谱的定量发生困难。七十年代以来,由于脉冲富里叶变换技术的发展,弛予试剂的添加以及门控去偶技术的采用,陆续解决了核磁共振炭谱定量技术中的各个
The ~ (13) C nuclear magnetic resonance spectroscopy can directly determine the distribution of carbon atoms in the skeleton and can directly calculate the Hs / Cs value by means of the fat region in the carbon and hydrogen spectra, thus providing more accurate structural information . However, the sensitivity of ~ (13) C core is low, and the spin lattice relaxation time of each ~ (13) C core is different. The NOE values of ~ (13) C nucleus are different during wideband decoupling, difficult. Since the seventies, due to the development of pulsed Fourier transform technology, the addition of relaxation reagents and the adoption of gating and decoupling technology, one after another in the quantitative determination of carbon-nuclear magnetic resonance