相关实验视频

Updated: May 28, 2025

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

Published on: November 14, 2015

扩大分子开关工具箱:可光加载的二甲基乙烯机械

Medeina Steponavičiūtė¹, Debashis Majee¹, Bisheng Zhao²

¹Chemical and Biomolecular Engineering, College of Design and Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585.

Angewandte Chemie (International ed. in English)

|February 11, 2025

概括

研究人员使用dithienylethene (DTE) 开发了新的分子开关,可以通过光和机械力量控制. 这些新型机械为纳米技术中的潜在应用提供可逆切换.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
化学工程是化学工程的重要组成部分.

背景情况:

分子开关是纳米技术中的关键组件,模仿电气开关.
通过机械力可逆触发原子尺度重排仍然是一个重大挑战,因为债券选择性问题.

研究的目的:

引入基于二甲基乙烯 (DTE) 的新型机械.
研究DTE衍生物的机械化学循环逆转动力学.
用电磁辐射和机械力来证明可逆切换.

主要方法:

合成了两种基于DTE的新型机械体,其长度不同.
利用紫外线和超声波来在分子状态之间进行切换.
采用计算方法来分析机械-区域化学差异.
描述DTE-聚合物合物的切换周期.

主要成果:

通过可调节的聚合物附件成功合成了DTE机械体.
由光和机械力触发的两个状态之间的可逆切换的演示.
基于聚合物附着部位的机械化学循环逆转的区域化学差异的识别.
在最佳的DTE-聚合物合物中实现了许多切换周期.

结论:

基于DTE的机械可以通过光和机械力等外部刺激进行可逆切换.
聚合物链长度和附着位置影响机械化学反应.
这些发现为开发先进的响应力分子系统铺平了道路.

关键词:

CoGEF 计算中的 CoGEF 计算这就是dithienylethene.杆效应 - 杆效应机械型的机器人照片可以切换的可切换.

更多相关视频

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch

Published on: February 7, 2022

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

相关概念视频

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.

Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.