新型推挽式偶氮苯的合成与表征。顺→反异构化动力学研究

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-03-19 DOI:10.1016/j.dyepig.2025.112774

Gaspard Bichot , Xavier Sallenave , Rémi Métivier , Sébastien Péralta

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引用次数: 0

摘要

合成了12个新的偶氮苯分子，它们在4,4 '位上被广泛的电子供体和受体取代。这些基团的吸引和捐赠强度与DFT计算的分子偶极矩成正比。紫外-可见光谱分析表明，推拉效应的增加导致最大吸收波长从350 nm到480 nm发生了色移。验证了12个化合物的反式→顺式和顺式→反式光异构化。顺式→反式的热异构化定义为t1/2，对应于辐照后反式异构体的半衰期再现时间。这些t1/2也取决于电子受体和电子供体的强度，含氧化合物从几天到5分钟不等，叔胺化合物从220分钟到9毫秒不等。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Synthesis and characterization of new push-pull azobenzene. Cis → Trans isomerization kinetic study

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Synthesis and characterization of new push-pull azobenzene. Cis → Trans isomerization kinetic study

Twelve new azobenzene molecules substituted with a wide range of electron donor and acceptor groups in the 4,4′-position have been synthesized. The attractive and donative strengths of these groups are proportional to the molecular dipole moment calculated by DFT. UV–visible spectroscopy showed that the increase in the push-pull effect induced a bathochromic shift in the maximum absorption wavelength from 350 nm to 480 nm. The trans → cis and cis → trans photo-isomerizations of the twelve compounds were verified. The thermal isomerization cis → trans was defined by a t_1/2 corresponding to the half-time reappearance time of the trans isomer after irradiation. These t_1/2 also depend on the strength of the electron acceptor and electron donor and vary from several days to 5 min for oxygenated compounds and from 220 min to 9 ms for tertiary amine compounds.

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.