Department of Chemistry, Vanderbilt Institute of Chemical Biology, Vanderbilt Institute for Integrative Biosystems Research and Education, Vanderbilt University, Nashville, TN 37235, USA.
Nanoscale. 2012 Jul 21;4(14):4269-74. doi: 10.1039/c2nr30773a. Epub 2012 Jun 15.
Intensely and broadly absorbing nanoparticles (IBANs) of silver protected by arylthiolates were recently synthesized and showed unique optical properties, yet question of their dispersity and their molecular formulas remained. Here IBANs are identified as a superatom complex with a molecular formula of Ag(44)(SR)(30)(4-) and an electron count of 18. This molecular character is shared by IBANs protected by 4-fluorothiophenol or 2-naphthalenethiol. The molecular formula and purity is determined by mass spectrometry and confirmed by sedimentation velocity-analytical ultracentrifugation. The data also give preliminary indications of a unique structure and environment for Ag(44)(SR)(30)(4-).
最近合成了被芳基硫醇保护的强且宽吸收纳米颗粒（IBANs），它们表现出独特的光学性质，但它们的分散性和分子式仍存在问题。在这里，IBANs 被确定为具有分子式 Ag(44)(SR)(30)(4-)和电子数 18 的超原子配合物。由 4-氟苯硫酚或 2-萘硫酚保护的 IBANs 具有相同的分子特征。通过质谱法确定了分子式和纯度，并通过沉降速度-分析超速离心法进行了验证。这些数据还初步表明了 Ag(44)(SR)(30)(4-)的独特结构和环境。
