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DNP-Enhanced Ultrawideline Solid-State NMR Spectroscopy: Studies of Platinum in Metal–Organic Frameworks
Journal of Physical Chemistry Letters
  • Takeshi Kobayashi, Iowa State University
  • Frédéric A. Perras, Iowa State University
  • Tian Wei Goh, Iowa State University
  • Tanner L. Metz, Iowa State University
  • Wenyu Huang, Iowa State University
  • Marek Pruski, Iowa State University
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Ultrawideline dynamic nuclear polarization (DNP)-enhanced 195Pt 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 195Pt 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.

Reprinted (adapted) with permission from J. Phys. Chem. Lett., 2016, 7, pp 2322–2327. Copyright 2016 American Chemical Society.

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Takeshi Kobayashi, Frédéric A. Perras, Tian Wei Goh, Tanner L. Metz, et al.. "DNP-Enhanced Ultrawideline Solid-State NMR Spectroscopy: Studies of Platinum in Metal–Organic Frameworks" Journal of Physical Chemistry Letters Vol. 7 (2016) p. 2322 - 2327
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