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相关概念视频

Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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VSEPR Theory and the Basic Shapes02:52

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Overview of VSEPR Theory
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Molecular Models02:00

Molecular Models

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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相关实验视频

Updated: May 22, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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超分子素结合形状记忆执行器

Hongshuang Guo1, J Mikko Rautiainen2, Hao Zeng3

  • 1Tampere University - Hervanta Campus: Tampereen yliopisto - Hervannan kampus, Faculty of Engineering and Natural Sciences, Korkeakoulunkatu 8, Tampere, FINLAND.

Angewandte Chemie (International ed. in English)
|May 20, 2025
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概括
此摘要是机器生成的。

液晶弹性体 (LCE) 中更强的石化键 (ChB) 能够实现可编程的形状记忆和执行. 这些材料可用于制造光驱动机器人和温度响应执行器.

关键词:
石墨烯键 * 形状记忆 * 执行器 * 冲压 * 可编程 * 可编程

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科学领域:

  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学
  • 聚合物科学 聚合物科学

背景情况:

  • 液晶弹性体 (LCE) 是具有独特响应性质的先进材料.
  • 超分子化学提供了通过非共价相互作用来设计材料特性的途径.
  • 碳素键 (ChBs) 是一种具有可调节强度的非共价相互作用的类.

研究的目的:

  • 合成和研究超分子LCE,其中包括用于形状记忆和执行的ChB.
  • 探索ChB强度对材料性能的影响.
  • 展示这些功能化的LCE的潜在应用.

主要方法:

  • 合成具有不同ChB强度 (SeN和SN) 的LCEs.
  • 形状记忆效应 (SME) 和执行属性的表征.
  • 光谱分析 (固态NMR,拉曼) 和计算建模 (DFT) 以了解ChB相互作用.

主要成果:

  • 具有强烈SeN ChBs (-40至-43 kJ mol-1) 的LCE显示了SME和可逆执行.
  • 具有较弱 SN ChB (-32 到 -34 kJ mol-1) 的 LCE 不表现出这些特性.
  • 几个LCE转向双向SME,允许可编程的2D/3D形状转换和可重写的模式.
  • 展示的应用包括光驱爬行机器人和温度响应式执行器.

结论:

  • 对于设计功能性超分子LCE来说,ChB的强度和特异性至关重要.
  • 这些发现为先进的超分子执行器和形状变化的LCE铺平了道路.
  • 这项研究提供了分子层面的洞察力,了解LCE中的ChB相互作用.