Yue Xiaoyong, Xu Liguang, Lin Hengwei, Xu Chuanlai, Li Si
International Joint Research Center for Photo-responsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
Sci Bull (Beijing). 2023 Aug 30;68(16):1764-1771. doi: 10.1016/j.scib.2023.07.021. Epub 2023 Jul 15.
Chiral nanomaterials with different functions have been widely developed, but the deep understanding of the structural effects of nanocatalysts on enantioselective photocatalytic efficiency is still highly demanded. Herein, Pt and Pt-Au-bimetal-doped chiral nanostructures with various morphologies and compositions are facilely constructed using L-/D-arginine (L-/D-Arg) and mono-sulfonate tetraphenyl porphyrin (HTPPS) assemblies as chiral templates. Interestingly, these Pt and Pt-Au-doped chiral nanostructures, including nanorods (NR) and nanospheres (NS), can be well regulated by controlling pH, ionic strength, and reaction time of the assembling system of Arg and HTPPS. More impressively, specific Au growth direction along the Pt-doped chiral NR (L-/D-Pt-NR) is observed (from tip to middle) during the preparation of Pt-Au-bimetal-doped chiral NR (L-/D-Pt-Au-NR) and their compositions can be finely controlled by simply adjusting the concentrations of HAuCl. As expected, the chiral nanostructures exhibit superior enantioselective photocatalytic ability toward chiral organics under visible light: the oxidation rate of L-dihydroxy-phenylalanine (L-DOPA) catalyzed by L-Pt-NR (or D-DOPA catalyzed by D-Pt-NR) is about 60% higher than that of L-DOPA catalyzed by D-Pt-NR (or L-DOPA catalyzed by D-Pt-NR). This study provides a facile strategy to construct chiral nanostructures for the photocatalytic conversion of chiral organics.
具有不同功能的手性纳米材料已得到广泛开发，但对于纳米催化剂的结构效应如何影响对映选择性光催化效率仍有深入了解的迫切需求。在此，以L-/D-精氨酸（L-/D-Arg）和单磺酸四苯基卟啉（HTPPS）组装体作为手性模板，简便地构建了具有各种形态和组成的Pt及Pt-Au双金属掺杂手性纳米结构。有趣的是，这些Pt和Pt-Au掺杂的手性纳米结构，包括纳米棒（NR）和纳米球（NS），可以通过控制Arg和HTPPS组装体系的pH值、离子强度和反应时间来很好地调控。更令人印象深刻的是，在制备Pt-Au双金属掺杂手性纳米棒（L-/D-Pt-Au-NR）的过程中，观察到Au沿着Pt掺杂的手性纳米棒（L-/D-Pt-NR）有特定的生长方向（从尖端到中间），并且通过简单调整HAuCl的浓度就可以精细控制它们的组成。正如预期的那样，这些手性纳米结构在可见光下对手性有机物表现出优异的对映选择性光催化能力：L-Pt-NR催化L-二羟基苯丙氨酸（L-DOPA）的氧化速率（或D-Pt-NR催化D-DOPA的氧化速率）比D-Pt-NR催化L-DOPA（或L-Pt-NR催化D-DOPA）高约60%。这项研究为构建用于手性有机物光催化转化的手性纳米结构提供了一种简便策略。
