Disclosed herein is a method to obtain the ∼300 kDa gold–hexanethiolate compound, extracted from the Faradaurate series of smaller (3) and larger (1) homologues, thereby permitting the first measurement of its distinctive properties by methods including mass spectrometry, optical spectroscopy, electron microscopy, X-ray scattering, and diffraction. The results suggest a monocrystalline metallic core (free of twinning planes) of ∼3.1 nm minimum dimension, which supports a clear plasmonic optical response, along with a diffuse exterior shell. An idealized model to account for this (and smaller) members of the series is proposed based on the completion of a convex core of regular truncated-octahedral (TO) morphology, that is, the TO (5,5) crystallite comprising 1289 sites. The diffuse layer may comprise the 240 S sites (thiolate sulfur headgroups) and 96 Au-adatom sites, giving a total composition (1385,240) and a molar mass of ∼301.0 kDa (90.7% Au). The ∼300 and ∼400 kDa gold compounds contain Au_∼1400 and Au_∼2000 atoms, respectively.

中文翻译：

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将300 kDa，_Au〜1400金化合物（标准3.6 nm_顶石）分离为一系列由脂肪族类硫代酸酯保护的等离子体纳米晶体

本文公开了一种获得约300 kDa的金-己硫醇盐化合物的方法，该化合物是从较小的（3）和较大的（1）同源物的法拉第酸酯系列中提取的，从而可以通过质谱，光谱法等方法对其特征进行首次测量，电子显微镜，X射线散射和衍射。结果表明最小尺寸约为3.1 nm的单晶金属核（无孪晶面），支持清晰的等离激元光学响应以及扩散的外壳。提出了一个理想的模型来说明该系列的这个（以及更小的）成员，它基于规则截短八面体（TO）形态的凸核的完成，即包含1289个位点的TO（5,5）晶体。扩散层可包含240个S位（硫醇盐硫首基）和96个Au-原子位点，总成分为（1385,240），摩尔质量约为301.0 kDa（90.7％Au）。约300和约400 kDa的金化合物含有Au原子分别为_〜1400和_Au〜2000。