Basu Srestha, Perić Bakulić Martina, Sanader Maršić Željka, Bonačić-Koutecký Vlasta, Amdursky Nadav
Schulich Faculty of Chemistry, Technion─Israel Institute of Technology, Haifa 3200003, Israel.
Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia.
ACS Nano. 2023 Sep 12;17(17):16644-16655. doi: 10.1021/acsnano.3c02846. Epub 2023 Aug 28.
Nanometer-scaled objects are known to have dimension-related properties, but sometimes the assembly of such objects can lead to the emergence of other properties. Here, we show the assembly of atomically precise gold nanoclusters into large fibrillar structures that are featuring excitation-dependent luminescence with an excitation-selective circularly polarized luminescence (CPL), even though all components are achiral. The origin of CPL in the assembly of atomic clusters has been attributed to the hierarchical organization of atomic clusters into fibrillar structures, mediated via a hydrogen bonding interaction with a surfactant. We follow the assembly process both experimentally and computationally showing the advance in the structural formation along with its chiroptical electronic properties, i.e., circular dichroism (CD) and CPL. Our study here can assist in the rational design of materials featuring chiroptical properties, thus leading to a controlled CPL activity.
已知纳米级物体具有与尺寸相关的特性，但有时此类物体的组装会导致其他特性的出现。在此，我们展示了原子精确的金纳米团簇组装成大型纤维状结构，这些结构具有依赖于激发的发光以及激发选择性圆偏振发光（CPL），尽管所有组分都是非手性的。原子团簇组装中CPL的起源归因于原子团簇通过与表面活性剂的氢键相互作用介导形成纤维状结构的分级组织。我们通过实验和计算跟踪组装过程，展示了结构形成及其手性光学电子特性（即圆二色性（CD）和CPL）的进展。我们在此的研究有助于合理设计具有手性光学特性的材料，从而实现可控的CPL活性。
