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Title: DNP-enhanced ultrawideline solid-state NMR spectroscopy: Studies of platinum in metal–organic frameworks

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [1];  [2];  [2];  [3];  [3]
  1. Ames Lab., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States)
+ Show Author Affiliations

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. Here, 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.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1278754
Report Number(s):
IS-J-9007
Journal Information:
Journal of Physical Chemistry Letters, Vol. 7, Issue 13; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

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  • Cavka, Jasmina Hafizovic; Jakobsen, Søren; Olsbye, Unni
  • Journal of the American Chemical Society, Vol. 130, Issue 42, p. 13850-13851 https://doi.org/10.1021/ja8057953
journal October 2008
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2 H Solid‐State NMR Spectroscopy Reveals the Dynamics of a Pyridine Probe Interacting with Coordinatively Unsaturated Metal Sites of MIL‐100(Al) Metal–Organic Frameworks journal July 2019
Large-scale ab initio simulations of MAS DNP enhancements using a Monte Carlo optimization strategy journal October 2018

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