福建师范大学姚传好团队报道了Ag₂和Ag₆簇之间的可逆相互转换及其响应光学特性。相关研究成果发表在2024年10月7日出版的《美国化学会杂志》。

探索由外部刺激引发的团簇结构相互转换引起了人们的极大兴趣，因为它有可能阐明金属团簇的结构-性能关系。

该项研究中，研究人员合成了两种类型的银簇，Ag₂和Ag₆。有趣的是，这些团簇对溶剂条件的变化表现出可逆的转变。这些团簇的结构和光学性质通过质谱、单晶X射线衍射、光致发光和辐射发光光谱等技术进行了彻底表征。

虽然Ag₂和Ag₆都显示出优异的光致发光性能，但与Ag₆相比，Ag₂在X射线辐射发光方面表现出优异的性能。由Ag2团簇制成的柔性闪烁体薄膜具有出色的X射线成像能力，空间分辨率为15.0 lp/mm，X射线剂量为0.58μGy s^-1时的检测极限令人印象深刻。该检测限比X射线诊断中使用的典型剂量率（5.5μGy s^-1）低近10倍。

该项工作介绍了一种能够进行溶剂依赖性可逆相互转化的无硫醇银团簇的新方法，为开发用于高级X射线成像应用的银团簇提供了新的见解。

附：英文原文

Title: Reversible Interconversion between Ag2 and Ag6 Clusters and Their Responsive Optical Properties

Author: Huixin Xiang, Yanze Wang, Xinqi Xu, Chenhao Ruan, Kunpeng Wang, Wanyu Cheng, Meng Zhou, Xiaowang Liu, Chuanhao Yao

Issue&Volume: October 7, 2024

Abstract: The exploration of structural interconversion in clusters triggered by external stimuli has attracted significant interest due to its potential to elucidate structure–property relationships of metal clusters. In this study, two types of silver clusters, Ag2 and Ag6, are synthesized. Interestingly, the clusters exhibit reversible transformations in response to changes in the solvent conditions. The structures and optical properties of these clusters are thoroughly characterized using techniques such as mass spectrometry, single-crystal X-ray diffraction, photoluminescence, and radioluminescence spectroscopy. While both Ag2 and Ag6 display excellent photoluminescence properties, Ag2 demonstrates superior performance in X-ray radioluminescence compared to Ag6. Flexible scintillator films fabricated from Ag2 clusters exhibit outstanding X-ray imaging capabilities, achieving a spatial resolution of 15.0 lp/mm and an impressive detection limit for an X-ray dose of 0.58 μGy s–1. This detection limit is nearly 10 times lower than the typical dose rate used in X-ray diagnostics (5.5 μGy s–1). This work introduces a novel approach for designing thiol-free silver clusters capable of solvent-dependent reversible interconversion, offering new insights into the development of silver clusters for advanced X-ray imaging applications.

DOI: 10.1021/jacs.4c11727

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c11727