Influence of Surface Protonation–Deprotonation Stimuli on the Chiroptical Responses of (<i>R</i>)-/(<i>S</i>)-Mercaptosuccinic Acid-protected Gold Nanoclusters
作者:Ryota Ueno、Hiroshi Yao
DOI:10.1246/cl.140953
日期:2015.2.5
Racemic mixtures of mercaptosuccinic acid (MSA) are optically resolved to obtain enantiopure (R)-/(S)-MSA, and the (R)-/(S)-MSA-protected gold nanoclusters are synthesized. Circular dichroism responses of the nanoclusters are strongly dependent on the pH of the solution. In particular, chiroptical enhancement is observed under highly acidic conditions, which can be due both to the electronic and conformational origins of the surface chiral MSA ligand.
通过光学拆分巯基琥珀酸(MSA)的外消旋混合物,获得对映体纯的(R)-/(S)-MSA,并合成(R)-/(S)-MSA保护的金纳米簇。纳米团簇的圆二色性响应很大程度上取决于溶液的 pH 值。特别是,在高酸性条件下观察到手性光学增强,这可能是由于表面手性 MSA 配体的电子和构象起源。