期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 14, 页码 3925-3929出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201701314
关键词
hydrogenation; hyperpolarization; intermetallics; parahydrogen; PtSn
资金
- NSF [CHE-1507230, CHE-1607305]
- Iowa State University
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1607305, 1609225, 1507230] Funding Source: National Science Foundation
Recently, a facile method for the synthesis of size-monodisperse Pt, Pt3Sn, and PtSn intermetallic nanoparticles (iNPs) that are confined within a thermally robust mesoporous silica (mSiO(2)) shell was introduced. These nanomaterials offer improved selectivity, activity, and stability for large-scale catalytic applications. Here we present the first study of parahydrogen-induced polarization NMR on these Pt-Sn catalysts. A 3000-fold increase in the pairwise selectivity, relative to the monometallic Pt, was observed using the PtSn@mSiO(2) catalyst. The results are explained by the elimination of the three-fold Pt sites on the Pt(111) surface. Furthermore, Pt-Sn iNPs are shown to be a robust catalytic platform for parahydrogen-induced polarization for in vivo magnetic resonance imaging.
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