Department of Chemistry and Department of Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA.
Department of Chemistry, Iowa State University, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.
Angew Chem Int Ed Engl. 2017 Mar 27;56(14):3925-3929. doi: 10.1002/anie.201701314. Epub 2017 Mar 9.
Recently, a facile method for the synthesis of size-monodisperse Pt, Pt Sn, and PtSn intermetallic nanoparticles (iNPs) that are confined within a thermally robust mesoporous silica (mSiO ) 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 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.
最近，人们提出了一种简便的方法来合成尺寸单分散的 Pt、PtSn 和 PtSn 金属间化合物纳米颗粒（iNPs），这些纳米颗粒被限制在热稳定的介孔二氧化硅（mSiO ）壳内。这些纳米材料为大规模催化应用提供了更高的选择性、活性和稳定性。在这里，我们首次研究了这些 Pt-Sn 催化剂的 Para 氢诱导极化 NMR。与单金属 Pt 相比，PtSn@mSiO 催化剂的成对选择性提高了 3000 倍。这一结果可以通过消除 Pt(111)表面上的三倍 Pt 位来解释。此外，Pt-Sn iNPs 被证明是用于体内磁共振成像的 Para 氢诱导极化的稳健催化平台。
