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DNP-Enhanced Ultrawideline Solid-State NMR Spectroscopy: Studies of Platinum in Metal-Organic Frameworks

TitleDNP-Enhanced Ultrawideline Solid-State NMR Spectroscopy: Studies of Platinum in Metal-Organic Frameworks
Publication TypeJournal Article
Year of Publication2016
AuthorsKobayashi, T, Perras, FA, Goh, TW, Metz, TL, Huang, WK, Pruski, M
JournalJournal of Physical Chemistry Letters
Volume7
Pagination2322-2327
Date Published07
Type of ArticleArticle
ISBN Number1948-7185
Accession NumberWOS:000379457400005
Keywordschemistry, complexes, dynamic nuclear-polarization, ions, magic-angle, magnetic-resonance, Materials Science, oxidation catalysis, physics, pulses, reduction, sites, Technology - Other Topics
Abstract

Ultrawideline dynamic nuclear polarization (DNP)-enhanced Pt-195 solid-state NMR (SSNMR) spectroscopy and theoretical calculations are used to determine the coordination of atomic Pt species supported within the pores of metal-organic frameworks (MOFs). The Pt-195 SSNMR spectra, with breadths reaching 10 000 ppm, were obtained by combining DNP with broadbanded cross-polarization and CPMG acquisition. Although the DNP enhancements in static samples are lower than those typically observed under magic-angle spinning conditions, the presented measurements would be very challenging using the conventional SSNMR methods. The DNP-enhanced ultrawideline NMR spectra served to separate signals from cis- and trans-coordinated atomic Pt2+ species supported on the UiO-66-NH2 MOF. Additionally, the data revealed a dominance of kinetic effects in the formation of Pt2+ complexes and the thermodynamic effects in their reduction to nanoparticles. A single cis-coordinated Pt2+ complex was confirmed in MOF-253.

DOI10.1021/acs.jpclett.6b00860
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3D Catalysis

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Alternate JournalJ. Phys. Chem. Lett.