Cl@Ag22Au6(4‐TBBT)28(PPh4): A Chloride‐Centered Ag−Au Bimetallic Cluster for Optics,Chemistry - An Asian Journal

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Cl@Ag22Au6(4‐TBBT)28(PPh4): A Chloride‐Centered Ag−Au Bimetallic Cluster for Optics
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-10-12 , DOI: 10.1002/asia.202001171
Gaya N. Andrew _{1,

2} , Haiming Wu ₁ , Rajini Anumula ₁ , Zhixun Luo _{1,

2}

Affiliation

We report the single‐crystal synthesis of a chlorine‐centered bimetallic cluster, Cl@Ag₂₂Au₆(4‐TBBT)₂₈(PPh₄), which bears a quatrefoil‐structured Cl@Ag₂₂(SR)₁₆ core studded by six Au(SR)₂ staples showing a quasi T_d symmetry. This cluster bears 28 metal atoms and 28 ligands, with a chlorine atom hosted in the center of the metallic Ag₂₂Au₆ core. Single‐crystal analysis shows that this cluster possesses essentially a different bonding nature compared with other monolayer‐protected metal clusters (MPCs) or traditional metal‐sulfur complexes. We fully dissect the structure evolution in forming such a chlorine‐centered cluster. Interestingly, this cluster, Cl@Ag₂₂Au₆(4‐TBBT)₂₈(PPh₄), displays a fluorescence emission at 570 nm and supports the solid emission with a minor red shift at 574 nm. On the other hand, we have tested the nonlinear optical property and observed unambiguous nonlinear optical property with a normal valley‐shaped transmittance curve corresponding to reverse saturated absorption (RSA) of the cluster.

中文翻译：

Cl @ Ag22Au6（4-TBBT）28（PPh4）：用于光学的氯化物居中的Ag-Au双金属簇

我们报告了一个以氯为中心的双金属簇Cl @ Ag ₂₂ Au ₆（4-TBBT）₂₈（PPh ₄）的单晶合成，该簇具有四叶形结构的Cl @ Ag ₂₂（SR）₁₆芯，由六个钉Au（SR）₂钉显示出近似的T _d对称性。该团簇带有28个金属原子和28个配体，氯原子位于金属Ag ₂₂ Au _6的中心核心。单晶分析表明，与其他单层保护的金属簇（MPC）或传统的金属硫络合物相比，该簇具有本质上不同的键合性质。我们充分剖析了形成这种以氯为中心的团簇的结构演变。有趣的是，此簇Cl @ Ag ₂₂ Au ₆（4-TBBT）₂₈（PPh ₄）在570 nm处显示荧光发射，并在574 nm处显示出少量红移的固体发射。另一方面，我们测试了非线性光学性质，并观察到了清晰的非线性光学性质，其正常的谷形透射率曲线对应于团簇的反向饱和吸收（RSA）。

更新日期：2020-12-01

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