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Title: Revealing the Configuration and Conformation of Surface Organometallic Catalysts with DNP-Enhanced NMR

Journal Article · · Journal of Physical Chemistry. C

Although single-site, supported organometallic catalysts were designed with homogeneity in mind, little is strictly known about their atomic-level structure and uniformity. This is in large part due to the inability of conventional characterization tools to provide structural information with adequate resolution and range for this purpose. In this work, we show that dynamic nuclear polarization (DNP)-enhanced solid-state nuclear magnetic resonance (NMR) enables the measurement of distances between the surface and individual carbons, making it possible to orient complexes and molecules on surfaces. We use this approach to determine the orientation and configuration of naturally 13C-abundant acetate and supported organoiridium(III) pincer complex, both supported on γ-Al2O3. By combining solid-state NMR and extended X-ray absorption fine structure spectroscopy (EXAFS) experiments with periodic density functional theory (DFT) calculations, we are able to determine the three-dimensional arrangement of ligands around the metal center and thereby identify the structure of the supported complex at a resolution reminiscent of that associated with single-crystal diffractometry.

Research Organization:
Ames Lab., Ames, IA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
Grant/Contract Number:
AC-02-07CH11358; DGE-1842165; AC-02-06CH11357
OSTI ID:
1798866
Alternate ID(s):
OSTI ID: 1831741
Report Number(s):
IS-J-10,522
Journal Information:
Journal of Physical Chemistry. C, Vol. 125, Issue 24; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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