Title: Excitation-Dependent Fluorescence with Excitation-Selective Circularly Polarized Luminescence from Hierarchically Organized Atomic Nanoclusters

Authors: Srestha Basu, Martina Perić Bakulić, Željka Sanader Maršić, Vlasta Bonačić-Koutecký, Nadav Amdursky

DOI: https://doi.org/10.1021/acsnano.3c02846

Date: 28/08/2023

Working Group: WG3

Grant Period: 1

Grant Period Goal (number): GAPG-4

Covered deliverables from the MoU (number): 2.6.3

Countries involved: Croatia, Israel

Number of female/young/ITC coauthors: 4

Abstract: 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.