Vladimir I. Bakhmutov, Douglas W. Elliott, Hong-Cai Zhou
{"title":"Kinetics of 1H →31P NMR cross-polarization and dynamics in a layered crystalline α-Sn(IV) phosphate","authors":"Vladimir I. Bakhmutov, Douglas W. Elliott, Hong-Cai Zhou","doi":"10.1016/j.ssnmr.2023.101898","DOIUrl":null,"url":null,"abstract":"<div><p>The proton-phosphorus (H–P) cross-polarization (CP) is effective in Sn(HPO<sub>4</sub>)<sub>2</sub>·H<sub>2</sub>O despite of the presence of paramagnetic ion impurities. Polarization constants T<sub>H-P</sub> and <sup>1</sup>H T<sub>1ρ</sub> times are measured in static Sn(HPO<sub>4</sub>)<sub>2</sub>·H<sub>2</sub>O by the kinetic variable-temperature H–P CP experiments. The temperature dependence of the <sup>1</sup>H T<sub>1ρ</sub><span> times is interpreted in terms of proton movements in the interlayer space occurring between the phosphate groups<span><span> without participation of the water molecules. The process requires an activation energy of 8.7 ± 0.7 kcal/mol. The </span>MAS effect on the </span></span><sup>1</sup>H T<sub>1ρ</sub> times is shown and discussed.</p></div>","PeriodicalId":21937,"journal":{"name":"Solid state nuclear magnetic resonance","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid state nuclear magnetic resonance","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0926204023000486","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
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 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.
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.
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