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Accessibility of Acidic Protons in 12-Phosphotungstic Acid and Its Cesium Hydrogen Salt as Revealed by Solid State NMR Spectroscopy

KANG Haixia1, YANG Jun2(1 College of Energy, China University of Geoscience (Beijing), Beijing 100083, China; 2 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071, Hubei, China)  
The accessibility of acidic protons in 12-phosphotungstic acid and its cesium hydrogen salt has been studied by the probe molecule trimethylphosphine and solid state NMR. The experimental results indicate that 2/5 acidic protons in the anhydrous 12-phosphotungstic acid can be accessed by the probe molecules. However, only acidic protons on the surface of the cesium salt of 12-phosphotungstic acid can be accessed by the probe molecules trimethylphosphine.
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