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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 Td 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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