Kim Sinhyeop, Kim Hyesun, Lee Changhoon, Park Ina, Kim Younghoon, Moon Dohyun, Shim Ji Hoon, Ryu Sunmin, Park Sarah S
Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Mak Planck POSTECH Center for Complex Phase of Materials, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
ACS Nano. 2024 Oct 22;18(42):29036-29044. doi: 10.1021/acsnano.4c10096. Epub 2024 Oct 10.
The atomically precise metal nanoclusters (NCs) have attracted significant attention due to their superatomic behavior originating from the quantum confinement effect. This behavior makes these materials suitable for various photoluminescence-based applications, including chemical sensing, bioimaging, and phototherapy, owing to their intriguing optical properties. Especially, the manipulation of inter- or intracluster interaction through cluster-assembled materials (CAMs) presents significant pathways for modifying the photophysical properties of NCs. Herein, two distinct CAMs, and , were synthesized via forming a coordination bond between [Au(-HMBA)] (-HMBA = 4-mercaptobenzoic acid) and Zn. exhibited a 6-fold higher luminescence intensity in the near-infrared region compared to , attributed to synergistic inter- and intracluster interactions that induce exciton delocalization and structure rigidification at the atomic scale. This study highlights the potential of diverse lattice symmetries in cluster-based frameworks for tuning the photophysical properties, contributing to a deeper understanding of the structure-property relationship in Au NCs.
原子精确的金属纳米团簇（NCs）因其源于量子限域效应的超原子行为而备受关注。由于其引人入胜的光学性质，这种行为使这些材料适用于各种基于光致发光的应用，包括化学传感、生物成像和光疗。特别是，通过团簇组装材料（CAMs）操纵团簇间或团簇内相互作用为修饰NCs的光物理性质提供了重要途径。在此，通过在[Au(-HMBA)]（-HMBA = 4-巯基苯甲酸）和Zn之间形成配位键，合成了两种不同的CAMs，即 和 。与 相比， 在近红外区域表现出高6倍的发光强度，这归因于协同的团簇间和团簇内相互作用，这些相互作用在原子尺度上诱导激子离域和结构刚性化。这项研究突出了基于团簇的框架中不同晶格对称性在调节光物理性质方面的潜力，有助于更深入地理解金纳米团簇的结构-性质关系。
