推动光控制聚合物的极限:超色和百色效应
Zhilei Wang1, Zipeng Zhang1, Chenyu Wu1
1Qingdao Institute for Theoretical and Computational Sciences, School of Chemistry and Chemical Engineering, Shandong University, Qingdao 266237, China.
Molecules (Basel, Switzerland)
|May 25, 2024
概括
一种新型的光催化剂,四乙烯四聚烯 (ZnTPTBP),显著增强了光诱导的电子/能量转移可逆添加-碎片化链转移 (PET-RAFT) 聚合. 这种改进的材料有效地利用深红光,将聚合率提高了49%.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 摄影化学的使用.
背景情况:
- 四甲 (ZnTPP) 是PET-RAFT聚合的有效光催化剂,但在色光谱中吸收能力有限.
- 较差的光吸收阻碍了需要深度光透的应用,尽管进行了广泛的研究,但尚未出现更优质的替代品.
- 在ZnTPP中Q波段的低吸收强度归因于特定的分子轨道退化.
研究的目的:
- 设计一种具有增强光吸收特性的新型光催化剂,用于PET-RAFT聚合.
- 提高光控制聚合物的效率和适用性,特别是在需要深度光透的系统中.
- 通过修改它们的吸收光谱来克服ZnTPP等现有光催化剂的局限性.
主要方法:
- 理论评估指导了新型光催化剂四四松氨酸 (ZnTPTBP) 的合理设计.
- ZnTPTBP是通过将外围的子分子引入到 ZnTPP 的醇环来合成的.
- 修改后的光催化剂的吸收光谱和在PET-RAFT聚合中的性能被实验评估.
主要成果:
- ZnTPTBP在其Q频段中表现出明显的高色和低色变化 (λmax = 655nm, εmax = 5.2×10^4 L/(mol·cm)).
- 这种修改增强了深红光 (650-700纳米) 的吸收,而不会增加在不太有用的较短波长的吸收.
- 与ZnTPP相比,ZnTPTBP的PET-RAFT聚合率增加了49%,并且保持了控制.
结论:
- 子部分的修改有效地提高了用于PET-RAFT聚合物的氨酸基材料的光催化性能.
- TPTBP代表了显著的进步,使得高效的光控制聚合利用深红光和良好的大气透.
- 这一发展为需要深度光透和高效利用太阳光的光固化应用开辟了新的途径.
相关概念视频
03:02Colors and Magnetism
12.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.1K
01:32UV–Vis Spectroscopy of Conjugated Systems
5.9K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is...
One of the factors influencing λmax is...
5.9K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.4K
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
Selection Rules: Photochemical Activation
1.4K
01:16Confocal Fluorescence Microscopy
16.0K
Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
16.0K
01:37Super-resolution Fluorescence Microscopy
12.3K
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
12.3K
01:14Photoluminescence: Applications
1.3K
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
1.3K