Hydride-induced ligand dynamic and structural transformation of gold nanoclusters during a catalytic reaction

Nasaruddin, Ricca Rahman and Yao, Qiaofeng and Chen, Tiankai and Hülsey, Max J. and Yan, Ning and Xie, Jianping (2018) Hydride-induced ligand dynamic and structural transformation of gold nanoclusters during a catalytic reaction. Nanoscale, 10 (48). pp. 23113-23121. E-ISSN 2040-3372

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Abstract

Quasi-homogeneous ligand-protected gold nanoclusters (Au NCs) with atomic precision and welldefined structure offer great opportunity for exploring the catalytic nature of nanogold catalysts at a molecular level. Herein, using real-time electrospray ionization mass spectrometry (ESI-MS), we have successfully identified the desorption and re-adsorption of p-mercaptobenzoic acid (p-MBA) ligands from Au25(p-MBA)18 NC catalysts during the hydrogenation of 4-nitrophenol in solution. This ligand dynamic (desorption and re-adsorption) would initiate structural transformation of Au25(p-MBA)18 NC catalysts during the reaction, forming a mixture of smaller Au NCs (Au23(p-MBA)16 as the major species) at the beginning of catalytic reaction, which could further be transformed into larger Au NCs (Au26(p-MBA)19 as the major species). The adsorption of hydrides (from NaBH4) is identified as the determining factor that could induce the ligand dynamic and structural transformation of NC catalysts. This study provides fundamental insights into the catalytic nature of Au NCs, including catalytic mechanism, active species and stability of Au NC catalysts during a catalytic reaction.

Item Type:	Article (Journal)
Additional Information:	8629/69163
Uncontrolled Keywords:	Metal Nanocluster, Catalytic Mechanism, Au25(SR)18, Au26(SR)19, Au23(SR)16
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Biotechnology Engineering Kulliyyah of Engineering
Depositing User:	Dr Ricca Rahman Nasaruddin
Date Deposited:	29 Jan 2019 16:38
Last Modified:	29 Jan 2019 16:38
URI:	http://irep.iium.edu.my/id/eprint/69163

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