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Title: Natural abundance 17O DNP two-dimensional and surface-enhanced NMR spectroscopy

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b03905· OSTI ID:1227378
 [1];  [1];  [2]
  1. Ames Lab., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Due to its extremely low natural abundance and quadrupolar nature, the 17O nuclide is very rarely used for spectroscopic investigation of solids by NMR without isotope enrichment. Additionally, the applicability of dynamic nuclear polarization (DNP), which leads to sensitivity enhancements of 2 orders of magnitude, to 17O is wrought with challenges due to the lack of spin diffusion and low polarization transfer efficiency from 1H. Here, we demonstrate new DNP-based measurements that extend 17O solid-state NMR beyond its current capabilities. The use of the PRESTO technique instead of conventional 1H–17O cross-polarization greatly improves the sensitivity and enables the facile measurement of undistorted line shapes and two-dimensional 1H–17O HETCOR NMR spectra as well as accurate internuclear distance measurements at natural abundance. This was applied for distinguishing hydrogen-bonded and lone 17O sites on the surface of silica gel; the one-dimensional spectrum of which could not be used to extract such detail. As a result, this greatly enhanced sensitivity has enabled, for the first time, the detection of surface hydroxyl sites on mesoporous silica at natural abundance, thereby extending the concept of DNP surface-enhanced NMR spectroscopy to the 17O nuclide.

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:
1227378
Report Number(s):
IS-J-8740
Journal Information:
Journal of the American Chemical Society, Vol. 137, Issue 26; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 108 works
Citation information provided by
Web of Science

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35 Cl dynamic nuclear polarization solid-state NMR of active pharmaceutical ingredients journal January 2016
Understanding Surface and Interfacial Chemistry in Functional Nanomaterials via Solid-State NMR journal March 2017
Electron spin density matching for cross-effect dynamic nuclear polarization journal January 2019
Shedding light on the atomic-scale structure of amorphous silica–alumina and its Brønsted acid sites journal January 2019
Direct 17 O dynamic nuclear polarization of single-site heterogeneous catalysts journal January 2018
Probing the surface of γ-Al 2 O 3 by oxygen-17 dynamic nuclear polarization enhanced solid-state NMR spectroscopy journal January 2018
Natural abundance 14 N and 15 N solid-state NMR of pharmaceuticals and their polymorphs journal January 2016
Tuning nuclear depolarization under MAS by electron T 1e journal January 2018
Natural abundance O 17 and S 33 nuclear magnetic resonance spectroscopy in solids achieved through extended coherence lifetimes journal October 2019
Shedding light on the atomic-scale structure of amorphous silica-alumina and its Brønsted acid sites text January 2019
Detection of the Surface of Crystalline Y 2 O 3 Using Direct 89 Y Dynamic Nuclear Polarization journal May 2019
Polymorphs of Theophylline Characterized by DNP Enhanced Solid-State NMR journal October 2015
De novo prediction of cross-effect efficiency for magic angle spinning dynamic nuclear polarization journal January 2019
Atomic Description of the Interface between Silica and Alumina in Aluminosilicates through Dynamic Nuclear Polarization Surface-Enhanced NMR Spectroscopy and First-Principles Calculations text January 2015