硬币金属腐蚀的反向光发射光谱学:与溶液相电化学的比较

IF 3.3 Q2 CHEMISTRY, MULTIDISCIPLINARY
Luca Giovanelli, Younal Ksari, Hela Mrezguia, Eric Salomon, Marco Minissale, Abraham B. Alemayehu, Abhik Ghosh
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引用次数: 0

摘要

对硬币金属腐蚀物的直接和反向光发射联合研究表明,在有利的情况下,反向光发射技术可以提供一些与电化学测量结果相对应的额外信息。因此,反向光发射光谱(IPES)提供了电子加入不同未占据轨道时的相对电子亲和力,而电化学还原电位则揭示了连续电子加入的能量。虽然所有三种共价金属三苯碳咯(TPC)复合物都表现出相似的电离电位,但它们的反向光发射光谱却大相径庭。对于铜[TPC],最低能量的 IPES 特征(0.74 eV)非常接近费米级;对于银[TPC],IPES 特征明显更高(1.65 eV),而对于金[TPC],IPES 特征更高(2.40 eV)。这些差异定性地反映了在电化学还原电位下观察到的差异,并与铜和银[TPC]的部分金属中心 LUMO 以及金[TPC]的完全基于珊瑚的 LUMO 有关;后者轨道对应于银[TPC]的 LUMO+1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Inverse Photoemission Spectroscopy of Coinage Metal Corroles: Comparison with Solution-Phase Electrochemistry

Inverse Photoemission Spectroscopy of Coinage Metal Corroles: Comparison with Solution-Phase Electrochemistry
A combined direct and inverse photoemission study of coinage metal corroles suggests that the latter technique, in favorable cases, can provide some additional information relative to electrochemical measurements. Thus, whereas inverse photoemission spectroscopy (IPES) provides relative electron affinities for electron addition to different unoccupied orbitals, electrochemical reduction potentials shed light on the energetics of successive electron additions. While all three coinage metal triphenylcorrole (TPC) complexes exhibit similar ionization potentials, they exhibit dramatically different inverse photoemission spectra. For Cu[TPC], the lowest-energy IPES feature (0.74 eV) is found to be exceedingly close to the Fermi level; it is significantly higher for Ag[TPC] (1.65 eV) and much higher for Au[TPC] (2.40 eV). These differences qualitatively mirror those observed for electrochemical reduction potentials and are related to a partially metal-centered LUMO in the case of Cu- and Ag[TPC] and a fully corrole-based LUMO in the case of Au[TPC]; the latter orbital corresponds to the LUMO+1 in the case of Ag[TPC].
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来源期刊
ACS Organic & Inorganic Au
ACS Organic & Inorganic Au 有机化学、无机化学-
CiteScore
4.10
自引率
0.00%
发文量
0
期刊介绍: ACS Organic & Inorganic Au is an open access journal that publishes original experimental and theoretical/computational studies on organic organometallic inorganic crystal growth and engineering and organic process chemistry. Short letters comprehensive articles reviews and perspectives are welcome on topics that include:Organic chemistry Organometallic chemistry Inorganic Chemistry and Organic Process Chemistry.
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