Enantioselective amplification on circularly polarized laser-induced chiral nucleation from a NaClO3 solution containing Ag nanoparticles
Enantioselective amplification on circularly polarized laser-induced chiral nucleation from a NaClO3 solution containing Ag nanoparticles
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DOI：
10.1039/c6ce01464j
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发表时间：
2016-10
期刊：
影响因子：
3.1
通讯作者：
Hiromasa Niinomi;T. Sugiyama;M. Tagawa;K. Murayama;S. Harada;T. Ujihara
中科院分区：
文献类型：
--
作者：
Hiromasa Niinomi;T. Sugiyama;M. Tagawa;K. Murayama;S. Harada;T. Ujihara
我们证明，使用连续波可见圆偏振激光（λ = 532 nm）通过 Ag 纳米聚集体的光学捕获诱导成核，可以引发 NaClO3 手性结晶中具有统计学意义的手性偏差。激光聚焦在空气和含有银纳米粒子的不饱和 NaClO3 水溶液之间的界面。通过改变入射圆偏振激光的旋向性，可以切换“主要”对映体，这表明手性偏向是对映选择性的。此外，已发现所得晶体对映体过量(CEE)达到约25％。 CEE远高于有机化合物不对称光合作用中典型的对映体过量(EE)，范围为0.5%至2%。成核的有效诱导和大的手性偏差意味着银纳米聚集体的局域表面等离子体共振对手性成核的贡献。我们的方法有可能为时空成核控制、手性化合物的光学拆分和生物同手性的研究提供益处。
We demonstrate that a statistically-significant chiral bias in NaClO3 chiral crystallization can be provoked by inducing nucleation via the optical trapping of Ag nano-aggregates using a continuous wave visible circularly polarized laser (λ = 532 nm). The laser was focused at the interface between air and an unsaturated NaClO3 aqueous solution containing Ag nanoparticles. The “dominant” enantiomorph was switchable by changing the handedness of the incident circularly polarized laser, indicating that the chiral bias is enantioselective. Moreover, it has been found that the resulting crystal enantiomeric excess (CEE) reached approximately 25%. The CEE is much higher than the typical enantiomeric excess (EE) in the asymmetric photosynthesis of organic compounds ranging from 0.5 to 2%. The efficient induction of the nucleation and the large chiral bias imply the contribution of localized surface plasmon resonance of the Ag nanoaggregates to chiral nucleation. Our method has potential to offer the benefit for studies on the spatiotemporal nucleation control, optical resolution of chiral compounds and biohomochirality.