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π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

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 number...
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Anchoring Junctions01:03

Anchoring Junctions

Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
VSEPR Theory and the Basic Shapes02:52

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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用于分子电子学的富勒烯基固组.

Christian A Martin1, Dapeng Ding, Jakob Kryger Sørensen

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands. martin@physics.leidenuniv.nl

Journal of the American Chemical Society
|September 16, 2008
PubMed
概括
此摘要是机器生成的。

我们开发了一种用于分子电子的新型富勒烯基. 这种基于富勒烯的分子表现出稳定的单分子结点,其导电率比传统的定群体更低.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 物理化学 物理化学

背景情况:

  • 分子电子学旨在使用单个分子作为电子元件.
  • 开发稳定的定组对于可靠的分子结点至关重要.
  • 富勒烯衍生物具有独特的电子和结构性质.

研究的目的:

  • 介绍和描述一个基于富勒的新型分子电子的定组.
  • 为了评估由这个新分子形成的单分子结的导电性和稳定性.
  • 为了比较其性能与已建立的基组,如1,4-二醇和1,4-二胺.

主要方法:

  • 在真空中使用石版机械可控制的断裂连接制造单分子连接.
  • 基于富勒烯的分子从溶液自组装到电极上.
  • 在低偏差下进行导电性测量.
  • 关节断裂事件的统计分析和组图分析.

主要成果:

  • 富勒烯结的分子自组装成稳定的单分子结.
  • 测量了一个低偏差导电量为3 x 10(-4) G0.
  • 与1,4-二醇相比,导电率的传播明显较低.
  • 在组图中比1,4-二胺更显著的签名,表明吸附更稳定.

结论:

  • 新的富勒基基组为分子电子学提供了稳定有效的动机.
  • 它在导电稳定性和吸附强度方面比现有分子具有优势.
  • 这项工作为先进的分子电子设备铺平了道路,这些设备使用的是烯.