甲基二甲作为绿色光激活型I光启动器用于快速基质聚合
Kun-You Chung1, Zachariah A Page1
1Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States.
Journal of the American Chemical Society
|August 4, 2023
概括
甲基二甲基 (甲基-BODIPY) 作为一种新型的I型激素光启动剂,有效地用绿光聚合树脂. 这一突破为先进制造业和生物医学应用提供了更安全,更低能耗的光源.
科学领域:
- 聚合物化学
- 摄影化学
- 材料科学
背景情况:
- 单分子 (I型) 基光启动器 (PI) 对于光刻和3D打印至关重要.
- 目前的PI主要使用高能紫外线 (≤420nm),限制了它们的应用范围.
- 需要使用更低能耗,更安全的光源来激活PI.
研究的目的:
- 开发一种由低能量的可见光激活的高效I型激光发射器.
- 证明甲基化BODIPY作为对绿光反应的光启动剂的有效性.
- 探索基化BODIPY作为新一类光启动剂的潜力.
主要方法:
- 甲基二甲 (甲基-BODIPY) 的合成和表征
- 使用绿光 (530 nm) 照射的烯基树脂进行光聚合实验.
- 使用现有的可见光光发射剂 (Ivocerin,Irgacure 784) 的比较研究.
- 进行光谱分析以阐明激素形成机制.
主要成果:
- 甲基化BODIPY在低强度 (4mW/cm2) 和度 (0.3mol%) 的绿光下显示出高的光发起效率.
- 在大约10秒内实现了烯酸树脂的快速聚合.
- 最先进的可见光PI在相同条件下没有显著的聚合.
- 光谱数据表明,在-碳键上的同解β裂变引发了基质的形成.
结论:
- 在绿光照射下,甲基化BODIPY作为有效的I型激素光发射剂.
- 该机制涉及通过-碳键裂变产生激素,并可能通过三重状态增强.
- 基化BODIPY为各种应用开发下一代光启动器提供了多功能平台.
- 这项技术有助于在制造业和生物医学领域使用光谱分离的低能光源.
相关概念视频
Radical Chain-Growth Polymerization: Overview
2.5K
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...
2.5K
Cationic Chain-Growth Polymerization: Mechanism
2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.6K
Radical Chain-Growth Polymerization: Mechanism
2.6K
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...
2.6K
Free-Radical Chain Reaction and Polymerization of Alkenes
7.9K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.9K
Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.1K
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.
2.1K

![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
