Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
J Am Chem Soc. 2015 Sep 16;137(36):11578-81. doi: 10.1021/jacs.5b07088. Epub 2015 Sep 8.
Silver nanoparticles with an atomically precise molecular formula Ag25(SR)18 (-SR: thiolate) are synthesized, and their single-crystal structure is determined. This synthesized nanocluster is the only silver nanoparticle that has a virtually identical analogue in gold, i.e., Au25(SR)18, in terms of number of metal atoms, ligand count, superatom electronic configuration, and atomic arrangement. Furthermore, both Ag25(SR)18 and its gold analogue share a number of features in their optical absorption spectra. This unprecedented molecular analogue in silver to mimic gold offers the first model nanoparticle platform to investigate the centuries-old problem of understanding the fundamental differences between silver and gold in terms of nobility, catalytic activity, and optical property.
合成了具有原子精确分子式 Ag25(SR)18（-SR：硫醇盐）的银纳米粒子，并确定了其单晶结构。就金属原子数量、配体数、超原子电子构型和原子排列而言，这种合成的纳米团簇是唯一与金具有几乎相同类似物的银纳米粒子，即 Au25(SR)18。此外，Ag25(SR)18及其金类似物在其光吸收光谱中具有许多共同特征。这种在银中前所未有的分子类似物模拟了金，为研究理解银和金在贵金属性、催化活性和光学性质方面的基本差异这一具有百年历史的问题提供了首个模型纳米粒子平台。
