Left- and right-handed chiral molecule inducers have been frequently used to guide the formation of chiral nanomaterials with binary chiral shapes. However, the transition of chiral nanomaterials from discrete to continuously tunable chiral shapes is imperative but challenging and will contribute to a deep understanding of the fundamental relations between chiral nanostructures and their chemical properties. This study shows that chiral polyaniline nanohelices (PANI NHs) with similar aspect ratios (∼5.0) but continuously tunable screw pitches (293 to ∞ nm) and tilt angles (33° to 0°) can be fabricated by adjusting the enantiomer excess of S/R-camphorsulfonic acid used as a chiral molecule inducer. After Au nanoparticles were loaded on the surface of chiral PANI NHs, the chiral morphology-dependent catalytic performances of PANI-Au NHs are studied in reduction, oxidation, and enantioselective catalytic reactions, showing that the larger the helical twist degree, the higher the catalytic activity and enantioselectivity of PANI-Au NHs.

中文翻译：

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具有手性连续体的聚苯胺纳米螺旋的精确控制及其对催化性能的相关性


左旋和右旋手性分子诱导剂经常用于指导具有二元手性形状的手性纳米材料的形成。然而，手性纳米材料从离散到连续可调的手性形状的转变势在必行，但具有挑战性，将有助于深入理解手性纳米结构与其化学性质之间的基本关系。这项研究表明，通过调整用作手性分子诱导剂的 S/R-樟脑磺酸的对映异构体过量，可以制造具有相似纵横比 （∼5.0） 但连续可调螺距 （293 至 ∞ nm） 和倾斜角 （33° 至 0°） 的手性聚苯胺纳米螺旋 （PANI NHs）。将 Au 纳米颗粒负载到手性 PANI NHs 表面后，研究了 PANI-Au NHs 在还原、氧化和对映选择性催化反应中的手性形态依赖性催化性能，结果表明螺旋扭曲度越大，PANI-Au NHs 的催化活性和对映选择性越高。