Solid State Nuclear Magnetic Resonance ( IF 1.8 ) Pub Date : 2023-08-23 , DOI: 10.1016/j.ssnmr.2023.101898 Vladimir I Bakhmutov 1 , Douglas W Elliott 1 , Hong-Cai Zhou 1
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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 TH-P and 1H T1ρ times are measured in static Sn(HPO4)2·H2O by the kinetic variable-temperature H–P CP experiments. The temperature dependence of the 1H T1ρ 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 T1ρ times is shown and discussed.
中文翻译：
层状结晶 α-Sn(IV) 磷酸盐中 1H →31P NMR 交叉极化动力学和动力学
尽管存在顺磁离子杂质，质子-磷（H–P）交叉极化（CP）在Sn(HPO 4 ) 2 ·H 2 O中仍然有效。通过动态变温H- P CP 实验在静态Sn(HPO 4 ) 2 ·H 2 O中测量了极化常数T H-P和1 H T 1ρ时间。1 H T 1ρ时间的温度依赖性可以根据在没有水分子参与的情况下磷酸基团之间发生的层间空间中的质子运动来解释。该过程需要 8.7 ± 0.7 kcal/mol 的活化能。显示并讨论了MAS 对1 H T 1ρ时间的影响。
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