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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Thermal Treatment of Glutamic Acid-Modified Nickel Nanoclusters on Au{111} Leads to the Formation of One-Dimensional Metal-Organic Coordination Networks
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Thermal Treatment of Glutamic Acid-Modified Nickel Nanoclusters on Au{111} Leads to the Formation of One-Dimensional Metal-Organic Coordination Networks

机译：在Au {111}上对谷氨酸修饰的镍纳米簇进行热处理导致形成一维金属-有机配位网络

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The adsorption of glutamic acid onto two-dimensional (2-D) Ni clusters on Au{111} has been investigated by reflection absorption infrared spectroscopy (RAIRS) and scanning tunneling microscopy (STM). Adsorption at 300 K leads to two distinct adsorbate species, which we conclude are zwitterionic species adsorbed either at Ni-like sites in the center of the clusters or at interfacial sites at the edges of clusters. Adsorption of (S)-glutamic acid causes the complete destruction of clusters of initial diameter <3 nm. We conclude that the Ni islands have been corroded, resulting in the formation of a Ni salt, presumably nickel(II) glutamate. On annealing to 350 K, chains of one-dimensional (1-D) molecular features are observed in STM experiments. We discuss the possible composition and structure of this salt and conclude that the chains most likely consist of nickel(II) pyroglutamate. Pyroglutamate is well-known to be produced by heating of glutamate salts. The intermolecular bonding and azimuthal alignment of the 1-D chains are discussed.
机译：通过反射吸收红外光谱（RAIRS）和扫描隧道显微镜（STM）研究了谷氨酸在Au {111}上的二维（2-D）Ni团簇上的吸附。在300 K的吸附下会产生两种不同的被吸附物，我们得出的结论是两性离子物质吸附在簇中心的Ni类位点或簇边缘的界面位。 （S）-谷氨酸的吸附导致初始直径<3 nm的簇的完全破坏。我们得出的结论是，镍岛已被腐蚀，导致形成了镍盐，大概是谷氨酸镍（II）。在退火至350 K时，在STM实验中观察到一维（1-D）分子特征的链。我们讨论了该盐的可能组成和结构，并得出结论，该链最有可能由焦谷氨酸镍（II）组成。众所周知，焦谷氨酸是通过加热谷氨酸盐产生的。讨论了1-D链的分子间键合和方位对准。

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