Interaction between organic molecules and a gold nanoparticle: a quantum chemical topological analysis

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作者
Rika Tandiana
Nguyen-Thi Van-Oanh
Carine Clavaguéra
机构
[1] CNRS,Université Paris
[2] Institut de Chimie Physique,Saclay
[3] UMR8000,undefined
来源
Theoretical Chemistry Accounts | 2021年 / 140卷
关键词
Quantum chemical topology; Gold nanoparticle; Non covalent interactions; DFT;
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摘要
The ligands at the surface of a gold nanoparticle (GNP) have a significant influence on the optical and physical properties, that may render different functionalities to the GNP. Therefore, there is a need in understanding the nature of the interaction at atomic resolution in order to allow rational design of GNPs with desired physico-chemical properties. The interaction between Au79\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{79}$$\end{document} and a series of small organic molecules has been systematically studied at the quantum mechanical level : methane, methanol, formic acid, hydrogen sulfide, benzene, and ammonia. The reactivity of Au79\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{79}$$\end{document} has been first analyzed by performing the condensed Fukui analysis to emphasize that the surface of Au79\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{79}$$\end{document} is dominated by electrophilic sites, with higher reactivity at the corner and edge atoms. The net charge transfer flowing from the organic molecules toward Au79\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{79}$$\end{document} comes from the electrophilic behavior of the GNP. Furthermore, the shape of the frontier molecular orbitals of Au79\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{79}$$\end{document} and of the incoming organic molecules has been found to dictate the preferred orientation of the adsorption. Several quantum chemical topological analyses of the electron density have been performed to further classify the interactions to weak dispersive or van der Waals interactions in methane and stronger non-covalent interactions in ammonia, benzene, hydrogen sulfide, methanol, and formic acid. The analysis of the electron localization function (ELF), on the other hand, provides more insight about the charge transfer, as the population of the basins of the organic molecules has decreased after interacting with Au79\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{79}$$\end{document}.
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