AI Article Synopsis
- The study reveals two structural isomers of a nanocluster with distinct structures and chiralities, specifically [AuAg(SR)(dppm)X]-C (chiral) and [AuAg(SR)(dppm)X]-Ac (achiral).
- These isomers were characterized using single-crystal X-ray diffraction and high-resolution electrospray ionization mass spectrometry.
- The findings highlight how different arrangements of the AuAg metal core affect the cluster's shape, contributing to the concept of structural isomerism in noble-metal nanoclusters, and suggest the potential for advancing research in chiral nanoclusters.
Article Abstract
Revealing structural isomerism in a nanocluster remains significant but challenging. Herein, we have obtained a pair of structural isomers, [AuAg(SR)(dppm)X]-C and [AuAg(SR)(dppm)X]-Ac [dppm = bis(diphenyphosphino)methane; HSR = 1-adamantanethiol/ tert-butylmercaptan; X = Br/Cl; C stands for one of the structural isomers being chiral; Ac stands for another being achiral], that show different structures as well as different chiralities. These structures are determined by single-crystal X-ray diffraction and further confirmed by high-resolution electrospray ionization mass spectrometry. On the basis of the isomeric structures, the most important finding is the different arrangements of the AuAg@Au metal core, leading to changes in the overall shape of the cluster, which is responsible for structural isomerism. Meanwhile, the two enantiomers of [AuAg(SR)(dppm)X]-C are separated by high-performance liquid chromatography. Our work will contribute to a deeper understanding of the structural isomerism in noble-metal nanoclusters and enrich the chiral nanocluster.
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| http://dx.doi.org/10.1021/acs.inorgchem.8b00183 | DOI Listing |
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