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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Symmetry, Shape, and Energy Variations in Frontier Molecular Orbitals at Organic/Metal Interfaces: The Case of F(4)TCNQ
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Symmetry, Shape, and Energy Variations in Frontier Molecular Orbitals at Organic/Metal Interfaces: The Case of F(4)TCNQ

机译:在有机/金属界面的边防分子轨道上的对称性,形状和能量变化:F(4)TCNQ的情况

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摘要

Near edge X-ray absorption, valence and core-level photoemission, and density functional theory calculations are used to study molecular levels of tetracyano-2,3,5,6-tetrafluoroquinodimethane (F(4)TCNQ) deposited on Ag(111) and BiAg2/Ag(111). The high electron affinity of F(4)TCNQ triggers a large static charge transfer from the substrate, and, more interestingly, hybridization with the substrate leads to a radical change of symmetry, shape, and energy of frontier molecular orbitals. The lowest unoccupied molecular orbital (LUMO) shifts below the Fermi energy, becoming the new highest occupied molecular orbital (n-HOMO), whereas the n-LUMO is defined by a hybrid band with mixed pi* and delta* symmetries, localized at quinone rings and cyano groups, respectively. The presence of Bi influences the way the molecule contacts the substrate with the cyano group. The molecule/surface distance is closer and the bond more extended over substrate atoms in F(4)TCNQ/Ag(111), whereas in F(4)TCNQ/BiAg2/Ag(111) the distance is larger and the contact more localized on top of Bi. This does not significantly alter molecular levels, but it causes the respective absence or presence of optical excitations in F(4)TCNQ core-level spectra.
机译:近边缘X射线吸收,价和核心水平光曝光,以及密度函数理论计算用于研究沉积的四环醇-2,3,5,6-四氟喹啉二喹啉二甲烷(F(4)TCNQ)的分子水平(111)和Biag2 / Ag(111)。 F(4)TCNQ的高电子亲和力从基板触发大的静电电荷,更有意义地与基板的杂交导致边防分子轨道的对称性,形状和能量的自由基变化。最低未占用的分子轨道(Lumo)在Fermi能量以下转变,成为新的最高占用的分子轨道(N-HOMO),而N-Lumo由杂交带定义为混合PI *和DELTA *对称,在奎尼昂局限地戒指和氰基分别。 BI的存在对分子与氰基接触基材的方式影响。分子/表面距离更近,键在F(4)TCNQ / AG(111)中的底物原子更延伸,而在F(4)中,距离更大,距离更大,接触更加局部在BI之上。这不会显着改变分子水平,但它导致F(4)TCNQ核心级光谱中的光学激发的各自缺失或存在。

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