在Au(111) 基板上形成高度排序的基因自组合单层
Tomasz Zaba1, Agnieszka Noworolska, Carleen Morris Bowers
1Smoluchowski Institute of Physics, Jagiellonian University , ul. Reymonta 4, 30-059 Krakow, Poland.
Journal of the American Chemical Society
|August 8, 2014
概括
高级自组装单层 (SAM) 是由终端n-alkynes在黄金表面上形成的. 这些基盐SAM具有与基酸盐SAM相似的特性,需要无氧条件才能获得高质量.
科学领域:
- 表面科学是一门科学.
- 材料化学 材料化学
- 纳米技术纳米技术
背景情况:
- 自组装单层 (SAM) 对于修改表面特性至关重要.
- 黄金上的乙酸盐得到了充分的研究,为比较提供了一个基准.
- 了解SAM的替代前体对于材料开发很重要.
研究的目的:
- 研究来自Au上终端n-alkynes的SAMs的形成和特性.
- 将基于基的SAM的结构和物理特征与传统的基酸盐SAM的结构和物理特征进行比较.
- 确定影响基 SAMs 质量和顺序的关键因素.
主要方法:
- 在60°C时使用终端n-alkynes (C5-C11) 在Au(111) 上制备SAMs.
- 通过扫描道显微镜 (STM) 对表面形态进行表征.
- 使用红外反射吸收光谱 (IRRAS) 和X射线光电子光谱 (XPS) 分析化学和结构信息.
- 测量接触角,以评估表面的疏水性.
主要成果:
- 确认了在Au{111}上从n-alkynes中形成高度排序的SAMs.
- 发现包装密度和分子取向与甲基酸SAMS相似.
- 高表面顺序,疏水性和包装密度表明与基酸盐SAM有很大的相似之处.
- 氧气污染会导致氧化污染物和由于基基组的氧化而导致的薄膜失序.
结论:
- 终端n-基因可以在Au{111}上形成高质量,有序的SAM,其特性与乙酸盐相似.
- 形成过程对氧气敏感,这会导致基因部分的不良氧化.
- 这些发现扩大了前体的范围,用于在黄金表面上创建有序的SAM.
相关概念视频
02:27Preparation of Alkynes: Alkylation Reaction
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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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02:38Electrophilic Addition to Alkynes: Halogenation
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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.
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02:37Structure and Physical Properties of Alkynes
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Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The...
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The...
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02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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02:40Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration
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Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.
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