在Ge(100) - 2 × 1表面上由三丁异化物形成强碳表面原始键
Bonggeun Shong1, Keith T Wong, Stacey F Bent
1Department of Chemical Engineering, Stanford University , 381 North-South Mall, Stanford, California 94305, United States.
Journal of the American Chemical Society
|April 15, 2014
概括
这项研究揭示了有机分子和半导体表面之间碳原始键形成的第一个实例. 特-基异化物与形成强烈的dative键,由于电子捐赠,呈现出独特的光谱特性.
科学领域:
- 表面科学是一门学科.
- 有机化学 有机化学
- 材料科学 材料科学 材料科学
背景情况:
- 了解半导体表面上的有机分子吸附对于开发新的电子和催化材料至关重要.
- 一种特定类型的坐标共价键,在表面化学中起着重要作用,但以前没有观察到有机分子中的碳与半导体结合.
研究的目的:
- 报告了对有机分子和半导体表面之间碳定性键形成的首次观察.
- 在 (100) 表面描述三丁异酸盐的吸附行为和结合机制.
- 为了研究这种dative结合对分子电子和振动特性的影响.
主要方法:
- 福里埃变换红外光谱法 (FTIR) 用于分析分子振动.
- 温度编程脱吸 (TPD) 用于确定吸附能量.
- 密度函数理论 (DFT) 计算以建模粘合和电子结构.
主要成果:
- 证实了 tert-butyl isocyanide 的异化碳与 Ge ((100) 表面之间的dative 键的形成.
- 测量了26.8kcal/mol的高实验吸附能量,这是这个表面上对有机分子观察到的最强的能量.
- 观察到NC伸展频率的显著蓝移,归因于异化物单一对到表面的σ捐赠,具有取决于覆盖范围的红移.
结论:
- 碳基键的形成是有机分子和半导体表面之间可行的相互作用机制.
- 强大的dative键和观察到的光谱变化为有机半导体相互作用提供了新的见解.
- 这一发现为设计具有定制电子特性的新型有机-无机混合材料开辟了道路.
相关概念视频
Hybridization of Atomic Orbitals II
36.5K
sp3d and sp3d 2 Hybridization
36.5K
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene
2.7K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
2.7K
π Molecular Orbitals of 1,3-Butadiene
8.6K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the...
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the...
8.6K
Hybridization of Atomic Orbitals I
51.7K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
51.7K
Catalysis
22.9K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
22.9K
Carbocations
11.3K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
11.3K


