Kinetics of 1H →31P NMR cross-polarization and dynamics in a layered crystalline α-Sn(IV) phosphate

IF 1.8 3区化学 Q4 CHEMISTRY, PHYSICAL

Solid state nuclear magnetic resonance Pub Date : 2023-10-01 DOI:10.1016/j.ssnmr.2023.101898

Vladimir I. Bakhmutov, Douglas W. Elliott, Hong-Cai Zhou

引用次数: 0

Abstract

The proton-phosphorus (H–P) cross-polarization (CP) is effective in Sn(HPO₄)₂·H₂O despite of the presence of paramagnetic ion impurities. Polarization constants T_H-P and ¹H T_1ρ times are measured in static Sn(HPO₄)₂·H₂O by the kinetic variable-temperature H–P CP experiments. The temperature dependence of the ¹H T_1ρ times is interpreted in terms of proton movements in the interlayer space occurring between the phosphate groups without participation of the water molecules. The process requires an activation energy of 8.7 ± 0.7 kcal/mol. The MAS effect on the ¹H T_1ρ times is shown and discussed.

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α-Sn(IV)磷酸层状晶体的1H→31P核磁共振交叉极化动力学及动力学

在Sn(HPO4)2·H2O中，尽管存在顺磁离子杂质，质子-磷(H-P)交叉极化(CP)仍然有效。用动态变温hp CP实验测量了静态Sn(HPO4)2·H2O的极化常数TH-P和1H T1ρ次。1H T1ρ时间的温度依赖性被解释为在没有水分子参与的情况下发生在磷酸基团之间的层间空间中的质子运动。该过程需要8.7±0.7 kcal/mol的活化能。给出并讨论了MAS对1H T1ρ时间的影响。

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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来源期刊

Solid state nuclear magnetic resonance 物理-光谱学

CiteScore

5.30

自引率

9.40%

发文量

审稿时长

72 days

期刊介绍： The journal Solid State Nuclear Magnetic Resonance publishes original manuscripts of high scientific quality dealing with all experimental and theoretical aspects of solid state NMR. This includes advances in instrumentation, development of new experimental techniques and methodology, new theoretical insights, new data processing and simulation methods, and original applications of established or novel methods to scientific problems.