高稳定的有机单层用于反应,具有进一步的功能:靠近表面的C-C键的作用
Sreenivasa Reddy Puniredd1, Ossama Assad, Hossam Haick
1The Department of Chemical Engineering and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Journal of the American Chemical Society
|September 23, 2008
概括
研究人员用有机分子对表面进行了功能化,发现结表面提供了增强的稳定性和强大的化学附着性,用于先进的应用.
科学领域:
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
- 纳米技术 纳米技术
背景情况:
- 晶体表面是电子和催化学的基础.
- 表面功能化是为特定应用量身定制属性的关键.
- 控制和有机分子之间的接口对于设备性能至关重要.
研究的目的:
- 为了研究晶体Si(111) 表面的化,使用具有不同碳-碳键的分子.
- 为了比较烯基终端表面与甲基和烯基终端表面的稳定性和覆盖率.
- 为了证明二次功能化的propenyl终端的各种化学部分的附着.
主要方法:
- 在晶体Si上采用两步化/化过程{111}.
- 射线光电子光谱 (XPS) 用于表面分析和覆盖范围的确定.
- 溶剂暴露试验,以评估表面的坚固性.
主要成果:
- 几乎完全覆盖了顶部的地点,使用类似于甲基和基的甲基化实现了这一目标.
- 用烯基终结的表面表现出减少氧化和增强对溶剂攻击的抵抗力.
- 通过使用TDBA-OSu交叉连接器证明了烯基终端表面的成功二次功能化.
结论:
- 烯基终结表面为分子功能化提供了稳定和多功能平台.
- Si-CH=CH-CH3 结合使各种化学基团能够稳定地附着在一起.
- 这种方法为分子电子,能源,催化和传感领域的先进应用开辟了道路.
相关概念视频
Properties of Organometallic Compounds
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
Lewis Structures of Molecular Compounds and Polyatomic Ions
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Stability of Conjugated Dienes
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Preparation and Reactions of Sulfides
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Carbocations
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Electrophilic Addition to Alkynes: Halogenation
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.


