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• W2316475507 abstract "The catalytic activity of tin-containing zeolites, such as Sn-Beta, is critically dependent on the successful incorporation of the tin metal center into the zeolite framework. However, synchrotron-based techniques or solid-state nuclear magnetic resonance (ssNMR) of samples enriched with 119Sn isotopes are the only reliable methods to verify framework incorporation. This work demonstrates, for the first time, the use of dynamic nuclear polarization (DNP) NMR for characterizing zeolites containing ∼2 wt % of natural abundance Sn without the need for 119Sn isotopic enrichment. The biradicals TOTAPOL, bTbK, bCTbK, and SPIROPOL functioned effectively as polarizing sources, and the solvent enabled proper transfer of spin polarization from the radical’s unpaired electrons to the target nuclei. Using bCTbK led to an enhancement (ε) of 75, allowing the characterization of natural-abundance 119Sn-Beta with excellent signal-to-noise ratios in <24 h. Without DNP, no 119Sn resonances were detected after 10 days of continuous analysis." @default.
• W2316475507 created "2016-06-24" @default.
• W2316475507 creator A5000269609 @default.
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• W2316475507 date "2014-04-16" @default.
• W2316475507 modified "2023-10-16" @default.
• W2316475507 title "Dynamic Nuclear Polarization NMR Enables the Analysis of Sn-Beta Zeolite Prepared with Natural Abundance ¹¹⁹Sn Precursors" @default.
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• W2316475507 doi "https://doi.org/10.1021/ja502113d" @default.
• W2316475507 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4017605" @default.
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• W2316475507 hasPublicationYear "2014" @default.
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