利用 13 C 化学位移各向异性和 T1 测量区分固体中的 COOH、COO- 和氢无序 COOH 位点。

IF 1.9 3区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Magnetic Resonance in Chemistry Pub Date : 2024-01-18 DOI:10.1002/mrc.5425
Ryan Toomey, Jacob Powell, Jacob Cheever, James K. Harper
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引用次数: 0

摘要

自 1993 年以来,人们就知道 13 C 化学位移张量(即 δ11 、 δ22 和 δ33 )提供的信息足以区分 COOH 和 COO- 位点。在此,我们提出了四种以前未报道过的用于区分 COOH/COO- 分子的指标。此外,还引入了一种新的关系,将 COOH 位点的不对称性(即 δ11 -δ22 )与氢键捐赠伙伴在 2.6 Å 范围内的接近程度相关联,且精确度极高(±0.05 Å)。相反,所有提出的度量方法都有一个局限性,那就是它们无法区分 COO-和氢键无序的 COOH 位点。13 C T1 值特别敏感,发现氢无序 COOH 分子的 T1 比 COO- 位点的 T1 小近六倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Distinguishing between COOH, COO−, and hydrogen disordered COOH sites in solids with 13C chemical shift anisotropy and T1 measurements

Since 1993, it has been known that 13C chemical shift tensor (i.e., δ11, δ22, and δ33) provides information sufficient to distinguish between COOH and COO sites. Herein, four previously unreported metrics are proposed for differentiating COOH/COO moieties. A new relationship is also introduced that correlates the asymmetry (i.e., δ11–δ22) of COOH sites to the proximity of hydrogen bond donating partners within 2.6 Å with high accuracy (±0.05 Å). Conversely, a limitation to all proposed metrics is that they fail to distinguish between COO and hydrogen disordered COOH sites. To reconcile this omission, a new approach is proposed based on T1 measurements of both 1H and 13C. The 13C T1 values are particularly sensitive with the T1 for hydrogen disordered COOH moieties found to be nearly six times smaller than T1's from COO sites.

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来源期刊
CiteScore
4.70
自引率
10.00%
发文量
99
审稿时长
1 months
期刊介绍: MRC is devoted to the rapid publication of papers which are concerned with the development of magnetic resonance techniques, or in which the application of such techniques plays a pivotal part. Contributions from scientists working in all areas of NMR, ESR and NQR are invited, and papers describing applications in all branches of chemistry, structural biology and materials chemistry are published. The journal is of particular interest not only to scientists working in academic research, but also those working in commercial organisations who need to keep up-to-date with the latest practical applications of magnetic resonance techniques.
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