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Does gold behaves as hydrogen? A joint theoretical and experimental study.

ABSTRACT: It has been established that the noble-metal-H analogue has been found in a large number of noble-metal-ligand clusters in view of geometric and electronic structures. Here, we demonstrated a different view of noble-metal-H analogue between noble-metal and hydrogen in M(SCH₃)₂ ^- (M = Cu, Ag, Au and H) systems. Although H(SCH₃)₂ ^- is a typical ion-hydrogen bonding cluster dramatically different from the chemical bonding clusters of M(SCH₃)₂ ^- (M = Cu, Ag and Au), the comparison of the two typical bonding patterns has not yet been fully investigated. Through a series of chemical bonding analyses, it is indicated that the evolution has been exhibited from typical ionic bonding in Cu(SCH₃)₂ ^- to a significant covalent bonding nature in Au(SCH₃)₂ ^- and hydrogen bonding dominating in H(SCH₃)₂ ^-. The comparison of M(SCH₃)₂ ^- (M = Cu, Ag and Au) with H(SCH₃)₂ ^- illustrates the differences in bonding between noble metals and hydrogen, which are mainly related to their diverse atomic orbitals participating in chemical bonding.

SUBMITTER: Qin Z

PROVIDER: S-EPMC9418258 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Does gold behaves as hydrogen? A joint theoretical and experimental study.

Qin Zhengbo Z Zhang Jiangle J Wang Chen C Wang Lin L Tang Zichao Z

Nanoscale advances 20200107 2

It has been established that the noble-metal-H analogue has been found in a large number of noble-metal-ligand clusters in view of geometric and electronic structures. Here, we demonstrated a different view of noble-metal-H analogue between noble-metal and hydrogen in M(SCH3)2 - (M = Cu, Ag, Au and H) systems. Although H(SCH3)2 - is a typical ion-hydrogen bonding cluster dramatically different from the chemical bonding clusters of ...[more]

PMID: 36133220

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Project description:Gold nanoparticles depending on their shape and mixtures of multiple shapes can exhibit peculiar optical properties, including the dichroic effect typical of the Lycurgus cup, which has puzzled scientists for a long time. Such optical properties have been recently exploited in several fields such as paint technology, sensors, dichroic polarizers, display (LCD) devices, laser applications, solar cells and photothermal therapy among others. In this article, we have demonstrated a simple room temperature one-pot synthesis of gold sol displaying a dichroic effect using a slow reduction protocol involving only trisodium citrate as a reducing agent. We found that the dichroic gold sol can be easily formed at room temperature by reducing gold salt by trisodium citrate below a certain critical concentration. The sol displayed an orangish-brown color in scattered/reflected light and violet/blue/indigo/purple/red/pink in transmitted light, depending on the experimental conditions. With minor changes such as the introduction of a third molecule or replacing a small amount of water in the reaction mixture with ethanol, the color of the gold sol under transmitted light changed and a variety of shades of red, pink, cobalt blue, violet, magenta and purple were obtained. The main advantage of the proposed method lies in its simplicity, which involves the identification of the right ratio of the reactants, and simple mixing of reactants at room temperature with no other requirements. TEM micrographs displayed the formation of two main types of particles viz. single crystal gold nanoplates and polycrystalline faceted polyhedron nanoparticles. The mechanism of growth of the nanoplates and faceted polyhedron particles have been described by an enhanced diffusion limited aggregation numerical scheme, where it was assumed that both trisodium citrate and the gold ions in solution undergo a stochastic Brownian motion, and that the evolution of the entire system is regulated by a principle of energy minimization. The predictions of the model matched with the experiments with a good accuracy, indicating that the initial hypothesis is correct.

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Does gold behaves as hydrogen? A joint theoretical and experimental study.

Publications

Does gold behaves as hydrogen? A joint theoretical and experimental study.

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