Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, USA.
J Am Chem Soc. 2011 Dec 7;133(48):19259-61. doi: 10.1021/ja207992r. Epub 2011 Nov 11.
Information on the emergence of the characteristic plasmonic optical properties of nanoscale noble-metal particles has been limited, due in part to the problem of preparing homogeneous material for ensemble measurements. Here, we report the identification, isolation, and mass spectrometric and optical characterization of a 76.3 kDa thiolate-protected gold nanoparticle. This giant molecule is far larger than any metal-cluster compound, those with direct metal-to-metal bonding, previously known as homogeneous molecular substances, and is the first to exhibit clear plasmonic properties. The observed plasmon emergence phenomena in nanomolecules are of great interest, and the availability of absolutely homogeneous and characterized samples is thus critical to establishing their origin.
纳米尺度贵金属粒子特有的等离子体光学性质的出现信息受到限制，部分原因是为了进行整体测量而制备同质材料。在这里，我们报告了一种 76.3 kDa 硫醇保护的金纳米粒子的鉴定、分离、质谱和光学特性。这种大分子远远大于任何金属簇化合物，包括具有直接金属-金属键的化合物，以前被认为是同质分子物质，并且是第一个表现出明显等离子体性质的物质。在纳米分子中观察到的等离子体出现现象非常有趣，因此获得绝对同质和特征化的样品对于确定其起源至关重要。
