Yousefalizadeh Goonay, Stamplecoskie Kevin G
Department of Chemistry, Queen's University, Chernoff Hall, Kingston, Ontario K7L 3N6, Canada.
J Chem Phys. 2021 Oct 7;155(13):134301. doi: 10.1063/5.0059624.
Superatom clusters, Au(SR), and the silver analog and alloys of the two metals have been extensively investigated for their structure, stability, photoluminescence, and electronic properties. One can readily tune the physicochemical properties by varying the ratio of Au/Ag or the thiol ligand to attain desired properties, such as enhanced emission, increased stability, and catalytic activity. Herein, excitation emission matrix spectroscopy and pump-probe transient absorption spectroscopy are used to show that the excited state dynamics of Au(SR), Ag(SR), and their alloys differ significantly despite having similar structures. State-resolved excited state behavior that is well documented for gold clusters is largely affected by the metal composition, becoming less pronounced for silver analogs, resulting in diversity in terms of their excited state energy and relaxation dynamics and resultant photophysical properties, such as emission.
超原子簇、Au(SR)、其银类似物以及这两种金属的合金因其结构、稳定性、光致发光和电子性质而受到广泛研究。通过改变金/银比例或硫醇配体，可以很容易地调节其物理化学性质，以获得所需的性质，如增强发射、提高稳定性和催化活性。在此，利用激发发射矩阵光谱和泵浦-探测瞬态吸收光谱表明，尽管Au(SR)、Ag(SR)及其合金具有相似的结构，但其激发态动力学却有显著差异。对于金簇有充分记录的态分辨激发态行为在很大程度上受金属组成的影响，对于银类似物则不太明显，导致其激发态能量、弛豫动力学以及由此产生的光物理性质（如发射）存在多样性。
