Solid-State NMR Studies of TBA3[VW5O19] and TBA4[PVW11O40]

doi:10.11938/cjmr20150302

Abstract

Abstract:

Polyoxometalates (POMs) are metal cluster compounds formed by transition metal atoms with d⁰ or d¹ electron configuration via edge or corner polycondensation. Because of their unique molecular structures and physical/chemical properties, POMs have been widely used in functional materials, catalytic chemistry and medicinal chemistry etc. Vanadium-substituted POMs often have high catalytic activities for hydrocarbon oxidation, and such activities are mainly related to the number of vanadium atom and the electron environment these atoms are in. Solid-state NMR, as one of the most important methods to characterize solid acid materials, has been widely applied to study POMs. In this paper, butanyl cations and vanadium atoms in Lindqvist and Keggin oxopolytungstates were characterized by ¹³C and ⁵¹V solid state NMR spectroscopy to obtain information on the local environment these cations and vanadium centers are in. Such information is important for understanding the oxidation catalytic mechanism. It is concluded that ⁵¹V solid state NMR spectroscopy can be a quick, convenient and nondestructive tool to study the local environment for vanadium atoms and the bulk morphologies of POMs.

Key words: polyoxometalates, solid-state NMR, ⁵¹V magic-angle-spinning spectroscopy, Lindqvist, Keggin

CLC Number:

O482.53

DING Li-hong1,2，LIU Xiao-long2，WANG Qiang2，LIU Wen-tao1，ZHU Cheng-shen1，ZHENG An-min2，DENG Feng2*. Solid-State NMR Studies of TBA₃[VW₅O₁₉] and TBA₄[PVW₁₁O₄₀][J]. Chinese Journal of Magnetic Resonance, 2015, 32(3): 409-418.

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Solid-State NMR Studies of TBA₃[VW₅O₁₉] and TBA₄[PVW₁₁O₄₀]

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