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Polymorphism of Phosphine‐Protected Gold Nanoclusters: Synthesis and Characterization of a New 22‐Gold‐Atom Cluster
Small ( IF 13.0 ) Pub Date : 2016-03-23 , DOI: 10.1002/smll.201600407
Qian-Fan Zhang 1 , Paul G. Williard 1 , Lai-Sheng Wang 1
Affiliation  

A new Au22 nanocluster, protected by bis(2‐diphenyl‐phosphino)ethyl ether (dppee or C28H28OP2) ligand, has been synthsized and purified with high yield. Electrospray mass spectrometry shows that the new cluster has a formula of Au22(dppee)7, containing 22 gold atoms and seven dppee ligands. The cluster is found to be stable as a solid, but metastable in solution. The new cluster has been characterized by UV‐Vis‐NIR absorption spectroscopy, collision‐induced dissociation, and 31P‐NMR. The properties of the new cluster have been compared with the previous Au22(dppo)6 nanocluster (dppo = 1,8‐bis(diphenyl‐phosphino)octane or C32H36P2), which contains two fused Au11 units. All the experimental data indicate that the new Au22(dppee)7 cluster is different from the previously known Au22(dppo)6 cluster and represents a new Au22 core, which contains most likely one Au11 motif with several Au2(dppee) or Au(dppee) units. The Au22(dppee)7 cluster provides a new example of the ligand effects on the nuclearity and structural polymorphism of phosphine‐protected atom‐precise gold nanoclusters.

中文翻译:

受膦保护的金纳米簇的多态性:新的22金原子团簇的合成和表征

一种新型的由双(2-二苯基-膦基)乙醚(dppee或C 28 H 28 OP 2)配体保护的Au 22纳米簇已经合成并高收率纯化。电喷雾质谱表明,新团簇的分子式为Au 22(dppee)7,其中包含22个金原子和七个dppee配体。发现该簇作为固体是稳定的,但是在溶液中是亚稳态的。新团簇的特征在于紫外可见近红外吸收光谱,碰撞诱导解离和31 P-NMR。已将新群集的属性与以前的Au 22(dppo)6进行了比较纳米簇(dppo = 1,8-双(二​​苯基-膦基)辛烷或C 32 H 36 P 2),其中包含两个熔融的Au 11单元。所有实验数据均表明,新的Au 22(dppee)7团簇与先前已知的Au 22(dppo)6团簇不同,代表了一个新的Au 22核,其中最有可能包含一个Au 11基序和几个Au 2(dppee)。 )或Au(dppee)单位。金22(dppee)7 团簇为配体对磷化氢保护的原子精确的金纳米团簇的核性和结构多态性的影响提供了一个新的例子。
更新日期:2016-03-23
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