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相关概念视频

Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

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Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.0K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.5K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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Organic Compounds03:02

Organic Compounds

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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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基于硫-2-碳甲的共价有机框架.

Xuefeng Wang1, Jing Ning1, Jianping Zhang1

  • 1College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, No.700 Changcheng Road, Qingdao, 266109, P.R. China.

Angewandte Chemie (International ed. in English)
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PubMed
概括

合成了基于 thiazole 的新型共价有机框架 (COF). 这些材料显示显著增强的发光,并使有毒离子 (Hg2+) 的敏感检测.

关键词:
共价有机框架是共价有机框架.在Hg2+传感器上.连接转换 连接转换摄影发光效应是一种光照效应.铁-2-碳化物单体的硫二甲基.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 有机化学 有机化学
  • 纳米技术 纳米技术

背景情况:

  • 聚合有机框架 (COF) 是具有可调节性质的晶体多孔聚合物.
  • 开发新的COF构建块对于扩大其应用至关重要.
  • 增强光发光和开发选择性传感器仍然是关键的研究领域.

研究的目的:

  • 为了合成一种新型的化物替代的[1,2-d:4,5-d']bis(thiazole) 单体 (BBTC).
  • 使用BBTC通过链接转化来创建因胺结合的COF,然后通过链接转化创建基于伊米达的COF.
  • 研究合成的COF的光学特性和传感能力,特别是用于重金属检测.

主要方法:

  • 易于合成BBTC单体,产量高.
  • 聚合BBTC以形成因胺结合的COF.
  • BBTC COFs的链接转化为伊米达N-异环碳素前体COFs (BBTC-INP COFs) 和伊米达-2-COFs (BBTC-IT COFs).
  • 光发光谱学用于确定量子产量.
  • 为检测Hg2+进行光传感实验.

主要成果:

  • 成功合成BBTC单体,并将其用于创建COF.
  • 与母公司BBTC COF相比,BBTC-INP和BBTC-IT COF显示光发光量子产量显著提高 (分别为2620倍和1810倍).
  • 在BBTC-IT COF中,Hg2+检测具有很高的选择性和灵敏度,检测极限低至60nM.
  • 在BBTC-IT COF中,thione组作为Hg2+的有效结合点.

结论:

  • 一系列基于 thiazole-2-carbaldehyde 的新型 COF 已成功合成.
  • 连接转换策略有效地提高了COF的光学特性.
  • 开发的BBTC-IT COF显示出对基于光的Hg2+敏感和选择性检测具有很大的前景.
  • 这项工作扩大了COF的多样性,并为开发各种应用的BBTC材料提供了一个平台.