Nonlinear Optical Signatures of Core and Ligand Electronic States in Au24PdL18
Nonlinear Optical Signatures of Core and Ligand Electronic States in Au24PdL18
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DOI：
10.1021/jz100327u
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发表时间：
2010-05-06
影响因子：
5.7
通讯作者：
Moran, Andrew M.
中科院分区：
文献类型：
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作者：
Miller, Stephen A.;Fields-Zinna, Christina A.;Moran, Andrew M.
用稳态和飞秒光谱研究了Au_（24）Pd（SCH_2CH_2Ph）（18）团簇的电子结构和弛豫动力学.这里研究的中心问题是电子态定位到簇的M-13核心和六个M-2-（SCH 2CH 2 Ph）（3）半环部分（即，M是Au或Pd）。光致发光光谱支持配体局域电子态的存在，表明Au 24 Pd（SCH 2CH 2 Ph）（18）符合先前建立的单层保护簇的大小从11到类似于201个Au原子的大小无关的发射频率的趋势。此外，瞬态光栅测量发现M-13核心内电子弛豫的时间尺度分离（
The electronic structure and relaxation dynamics of a bimetallic monolayer-protected cluster, Au24Pd(SCH2CH2Ph)(18), are investigated with steady-state and femtosecond optical spectroscopies. The central issue examined here is the localization of electronic states to the cluster's M-13 core and six M-2-(SCH2CH2Ph)(3) semiring moieties (i.e., M is Au or Pd). Photoluminescence spectra support the existence of ligand-localized electronic states by showing that Au24Pd(SCH2CH2Ph)(18) conforms to the trend of size-independent emission frequencies previously established for monolayer-protected clusters ranging in size from 11 to similar to 201 Au atoms. In addition, transient grating measurements find a separation in time scales for electronic relaxation within in the M-13 core (