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Title: Indirectly Detected DNP-Enhanced 17O NMR Spectroscopy: Observation of Non-Protonated Near-Surface Oxygen at Naturally Abundant Silica and Silica-Alumina

Journal Article · · ChemPhysChem

Abstract Recent studies have shown that dynamic nuclear polarization (DNP) can be used to detect 17 O solid‐state NMR spectra of naturally abundant samples within a reasonable experimental time. Observations using indirect DNP, which relies on 1 H mediation in transferring electron hyperpolarization to 17 O, are currently limited mostly to hydroxyls. Direct DNP schemes can hyperpolarize non‐protonated oxygen near the radicals; however, they generally offer much lower signal enhancements. In this study, we demonstrate the detection of signals from non‐protonated 17 O in materials containing silicon. The sensitivity boost that made the experiment possible originates from three sources: indirect DNP excitation of 29 Si via protons, indirect detection of 17 O through 29 Si nuclei using two‐dimensional 29 Si{ 17 O} D ‐HMQC, and Carr‐Purcell‐Meiboom‐Gill refocusing of 29 Si magnetization during acquisition. This 29 Si‐detected scheme enabled, for the first time, 2D 17 O− 29 Si heteronuclear correlation spectroscopy in mesoporous silica and silica‐alumina surfaces at natural abundance. In contrast to the silanols showing motion‐averaged 17 O signals, the framework oxygens exhibit unperturbed powder patterns as unambiguous fingerprints of surface sites. Along with hydroxyl oxygens, detection of these moieties will help in gaining more atomistic‐scale insights into surface chemistry.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1797583
Alternate ID(s):
OSTI ID: 1787409
Report Number(s):
IS-J-10,499
Journal Information:
ChemPhysChem, Vol. 22, Issue 14; ISSN 1439-4235
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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