Visible-light-induced tandem reaction of o -aminothiophenols and alcohols to benzothiazoles over Fe-based MOFs: Influence of the structure elucidated by transient absorption spectroscopy
作者:Dengke Wang、Josep Albero、Hermenegildo García、Zhaohui Li
DOI:10.1016/j.jcat.2017.01.014
日期:2017.5
contrast to MIL-68(Fe). This study not only provides an economical, sustainable, and thus green process for the production of 2-substituted benzothiazoles, but also illustrates the potential of using transient absorption spectroscopy as an important tool for understanding the photophysics of MOFs, which are believed to show great potential as multifunctional catalysts for light-induced organic transformations
发现两种基于Fe的MOF MIL-100(Fe)和MIL-68(Fe)具有活性,可在氧气(O 2)可见光照射下,醇与邻氨基硫酚之间发生氧化缩合反应,形成2取代的苯并噻唑。作为氧化剂。该反应可以以中等到高产率应用于各种各样的底物。对照实验和ESR结果显示超氧化物自由基(Ø2--)介导的途径,该途径源自光生Fe 2+对O 2的还原在Fe–O团簇上。整个多步反应受醇光氧化成醛的步骤限制。MIL-100(Fe)的催化性能优于MIL-68(Fe),因为与MIL-(Fe-)相比,其较高浓度的长寿命(μs时间标度)正空穴可以在MIL-100(Fe)上光生。 68(铁)。这项研究不仅为生产2取代的苯并噻唑提供了一种经济,可持续,绿色的方法,而且还说明了使用瞬态吸收光谱法作为了解MOF的光物理性质的重要工具的潜力,据信,MOF的光学性质很好。作为光诱导有机转化的多功能催化剂的潜力。