化学
激发态
电子转移
同音
放松(心理学)
星团(航天器)
量子产额
金团
光化学
金属
化学物理
原子物理学
电子结构
计算化学
荧光
物理
心理学
有机化学
社会心理学
程序设计语言
量子力学
计算机科学
作者
Kevin G. Stamplecoskie,Prashant V. Kamat
摘要
Glutathione-protected gold clusters exhibit size-dependent excited state and electron transfer properties. Larger-size clusters (e.g., Au25GSH18) with core-metal atoms display rapid (<1 ps) as well as slower relaxation (~200 ns) while homoleptic clusters (e.g., Au(10-12)GSH(10-12)) exhibit only slower relaxation. These decay components have been identified as metal-metal transition and ligand-to-metal charge transfer, respectively. The short lifetime relaxation component becomes less dominant as the size of the gold cluster decreases. The long-lived excited state and ability to participate in electron transfer are integral for these clusters to serve as light-harvesting antennae. A strong correlation between the ligand-to-metal charge-transfer excited state lifetime and photocatalytic activity was evidenced from the electron transfer to methyl viologen. The photoactivity of these metal clusters shows increasing photocatalytic reduction yield (0.05-0.14) with decreasing cluster size, Au25 < Au18 < Au15 < Au(10-12). Gold clusters, Au18GSH14, were found to have the highest potential as a photosensitizer on the basis of the quantum yield of electron transfer and good visible light absorption properties.
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