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Chirality enhancement in macro-chiral liquid crystal nanoparticles
Materials Horizons ( IF 12.2 ) Pub Date : 2020-09-17 , DOI: 10.1039/d0mh01274b
Huanan Yu 1, 2, 3, 4 , Chris Welch 1, 2, 3, 4 , Wentao Qu 5, 6, 7, 8, 9 , Christopher J. Schubert 1, 2, 3, 4 , Feng Liu 5, 6, 7, 8, 9 , Giuliano Siligardi 4, 10, 11, 12 , Georg H. Mehl 1, 2, 3, 4, 5
Affiliation  

The amplification of molecular chirality by metal nanoparticles (NPs) is an important and rapidly evolving field in nanomaterial research with wide applications in smart materials, catalysis, and solvent–solute interactions. Here we present the results of the synthesis of gold nanoparticles (AuNPs) functionalized both with chiral ligands based on the binaphthol motif and with nematogenic groups (ChirAuLC). The materials were characterized chemically and the ratios between chiral groups and LC groups was determined. Synchrotron radiation circular dichroism (SRCD) and synchrotron based X-ray diffraction (XRD) studies show that the AuNPs favoured by the LC state arrange themselves into ordered columns and a helical superstructure appears in the mesophase of collective NPs. A specific focus has been the investigation of the chiral induction of ChirAuLC composites in two different nematic LC hosts. For a number of selected mixtures, the helical twisting power (HTP) of these NPs in systems was calculated from systematic optical observations based on optical polarizing microscopy (OPM). The experimental data show that the HTP of the investigated ChirAuLC composite is significantly larger than that of free “small molecule” chiral groups when dispersed in the same LC host and the chiral transfer efficiency of ChirAuLC is higher than NPs functionalized only with chiral groups (ChirAuNP). This is new and can be explained by a combination of a surface chirality and the domino effect of bound mesogens interacting with the bulk.

中文翻译:

大手性液晶纳米粒子的手性增强

金属纳米颗粒(NPs)放大分子手性是纳米材料研究中一个重要且发展迅速的领域,在智能材料,催化作用和溶剂-溶质相互作用中得到广泛应用。在这里,我们介绍了金纳米颗粒(AuNPs)的合成结果,该纳米颗粒同时具有基于Binaphthol基序的手性配体和具有生瘤基团(ChirAuLC)的功能。对材料进行化学表征,并确定手性基团与LC基团之间的比例。同步辐射圆二色性(SRCD)和基于同步加速器的X射线衍射(XRD)研究表明,受到LC状态青睐的AuNP排列成有序的列,并且螺旋上层结构出现在集体NP的中间相中。一个特别的重点是在两种不同的向列型LC宿主中手性诱导ChirAuLC复合材料的研究。对于许多选定的混合物,系统中这些NP的螺旋扭曲力(HTP)是根据基于光学偏振显微镜(OPM)的系统光学观察结果计算得出的。实验数据表明,所研究的ChirAuLC复合物的HTP在分散于同一LC宿主中时明显大于游离的“小分子”手性基团,并且ChirAuLC的手性转移效率高于仅用手性基团官能化的NP(ChirAuNP )。这是新的,并且可以通过表面手性和结合的液晶元与主体相互作用的多米诺效应的组合来解释。这些NP在系统中的螺旋扭曲能力(HTP)是根据基于光学偏振显微镜(OPM)的系统光学观察结果计算得出的。实验数据表明,所研究的ChirAuLC复合物的HTP在分散于同一LC宿主中时明显大于游离的“小分子”手性基团,并且ChirAuLC的手性转移效率高于仅用手性基团官能化的NP(ChirAuNP )。这是新的,并且可以通过表面手性和结合的液晶元与主体相互作用的多米诺效应的组合来解释。这些NP在系统中的螺旋扭曲能力(HTP)是根据基于光学偏振显微镜(OPM)的系统光学观察结果计算得出的。实验数据表明,所研究的ChirAuLC复合物的HTP在分散于同一LC宿主中时明显大于游离的“小分子”手性基团,并且ChirAuLC的手性转移效率高于仅用手性基团官能化的NP(ChirAuNP )。这是新的,并且可以通过表面手性和结合的液晶元与主体相互作用的多米诺效应的组合来解释。实验数据表明,所研究的ChirAuLC复合物的HTP在分散于同一LC宿主中时明显大于游离的“小分子”手性基团,并且ChirAuLC的手性转移效率高于仅用手性基团官能化的NP(ChirAuNP )。这是新的,并且可以通过表面手性和结合的液晶元与主体相互作用的多米诺效应的组合来解释。实验数据表明,所研究的ChirAuLC复合物的HTP在分散于同一LC宿主中时明显大于游离的“小分子”手性基团,并且ChirAuLC的手性转移效率高于仅用手性基团官能化的NP(ChirAuNP )。这是新的,并且可以通过表面手性和结合的液晶元与主体相互作用的多米诺效应的组合来解释。
更新日期:2020-09-29
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