Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.
J Am Chem Soc. 2011 Mar 23;133(11):3913-20. doi: 10.1021/ja108451v. Epub 2011 Feb 28.
Silver clusters too small to support a plasmon band possess interesting fluorescence properties as well as being a convenient route to studying the early stages of nanoparticle formation. Fluorescent silver clusters are synthesized in toluene solution, and the formation is monitored herein by laser flash photolysis (LFP). Kinetic analysis of the formation of the Ag clusters is consistent with the formation of the smallest possible clusters, silver dimers (Ag(2)), whereby a mechanism for the formation of these clusters is provided as well as the first reported extinction coefficient and association constant for Ag(0) to form Ag(2). The formation of Ag(2) clusters is contrasted with the formation of Ag nanoparticles in aqueous media, and the particular stability and selectivity toward Ag(2) in this system is also studied using LFP.
太小而无法支持等离子体带的银簇具有有趣的荧光性质，并且是研究纳米颗粒形成早期阶段的便捷途径。荧光银簇在甲苯溶液中合成，并通过激光闪光光解（LFP）在此监测其形成。银簇形成的动力学分析与最小可能的簇，银二聚体（Ag(2)）的形成一致，从而提供了形成这些簇的机制，以及首次报道的 Ag(0)形成 Ag(2)的消光系数和缔合常数。将 Ag(2)簇的形成与在水介质中形成 Ag 纳米颗粒进行对比，并使用 LFP 研究了该体系中 Ag(2)的特殊稳定性和选择性。
