結合の化学的変換 協和有機フレームワーク
Peter J Waller1, Steven J Lyle1, Thomas M Osborn Popp1,2
1Department of Chemistry, University of California-Berkeley , Materials Sciences Division, Lawrence Berkeley National Laboratory, Kavli Energy NanoSciences Institute at Berkeley, and Berkeley Global Science Institute, Berkeley, California 94720, United States.
Journal of the American Chemical Society
|December 10, 2016
まとめ
研究者は,イミン共性有機フレームワーク (COF) を,より安定したアミドCOFに直接酸化によって変換した. この新しい方法は,常見の合成課題を回避し,永久の多孔性と化学的な安定性を有する結晶材料を生成します.
科学分野:
- 材料科学
- 有機化学
- ナノテクノロジー
背景:
- 協和有機フレームワーク (COF) は,調節性特性を有する結晶性多孔ポリマーである.
- COFのイミン結合は水解に敏感であり,その安定性を制限する.
- アミドCOFを直接合成することは,枠内でアミド結合を形成することが困難である.
研究 の 目的:
- 既存のイミンCOFをより安定したアミドCOFに変換する方法を開発する.
- 化学的変換後の結晶性および多孔性の保持を調査する.
- 直接合成するのが難しいアミドCOFにアクセスするための新しい戦略を実証する.
主な方法:
- 前合成のCOF (TPB-TP-COFと4PE-1P-COF) のイミン結合を直接酸化してアミド結合を形成する.
- FT-IRおよび13C CP-MAS NMRスペクトロシーを用いた結果のアミドCOF (1'および2') の特性.
- 結晶性の評価と永久の孔性の保持
主要な成果:
- 完全酸化でイミンCOFを同構造アミドCOFに変換する.
- 結晶性の維持と,結果として COF の永久性.
- COF結合の最初の化学変換と,COF合成における"結晶化問題"を回避する方法の実証.
- アミドCOFは,イミン前駆体と比較して化学的安定性が向上した.
結論:
- 直接酸化は,イミンCOFから安定したアミドCOFを合成する有効な経路を提供します.
- このアプローチは,以前は新合成で入手が困難だったアミドCOFへのアクセスを可能にします.
- その結果,アミドCOFは化学的安定性を高め,多孔性などの望ましい構造特性を保持します.
関連する概念動画
Properties of Organometallic Compounds
1.9K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.9K
What is Organic Chemistry?
97.3K
Organic chemistry is the study of compounds of carbon called organic compounds. Organic compounds either originate from living organisms or are synthesized by chemists. A defining trait of these compounds is the presence of carbon as the principal element, which is bonded to other carbon atoms and other elements such as hydrogen, oxygen, nitrogen, and sulfur. The existence of a wide array of organic molecules is a consequence of carbon atoms’ ability to form up to four strong bonds to...
97.3K
Radical Chain-Growth Polymerization: Overview
3.6K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
3.6K
Radical Chain-Growth Polymerization: Mechanism
3.7K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
3.7K
Polymer Classification: Architecture
4.0K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
4.0K
Characteristics and Nomenclature of Homopolymers
4.2K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
4.2K


