Dery Shahar, Kim Suhong, Feferman Daniel, Mehlman Hillel, Toste F Dean, Gross Elad
Institute of Chemistry and The Centre for Nanoscience and Nanotechnology, The Hebrew University, Jerusalem 91904, Israel.
Phys Chem Chem Phys. 2020 Sep 14;22(34):18765-18769. doi: 10.1039/d0cp00642d. Epub 2020 Mar 20.
Site-dependent selectivity in oxidation reactions on Pt nanoparticles was identified by conducting IR nanospectroscopy measurements while using allyl-functionalized N-heterocyclic carbenes (allyl-NHCs) as probe molecules. Following exposure to oxidizing conditions the allyl groups in NHCs that were located on the center of Pt nanoparticles were oxidized to hydroxyl while those located on the nanoparticle's periphery were oxidized into carboxylic acid. The superior reactivity on the periphery of the nanoparticles was correlated to higher density of low coordinated atoms on these surface sites.
通过使用烯丙基官能化的N-杂环卡宾（allyl-NHCs）作为探针分子进行红外纳米光谱测量，确定了铂纳米颗粒上氧化反应的位点依赖性选择性。在暴露于氧化条件下后，位于铂纳米颗粒中心的NHCs中的烯丙基被氧化为羟基，而位于纳米颗粒周边的烯丙基则被氧化为羧酸。纳米颗粒周边的优异反应活性与这些表面位点上低配位原子的较高密度相关。
