Zhang Keke, Zhang Fulin, Huang Fengwei, Xiong Kanghui, Zeng Bing, Lang Xianjun
Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
ACS Appl Mater Interfaces. 2024 Oct 2;16(39):52455-52465. doi: 10.1021/acsami.4c11616. Epub 2024 Sep 17.
Toward visible light photocatalysis, covalent organic frameworks (COFs) have recently garnered growing attention. The effect of different orientations of imine of imine-linked COFs on photocatalysis should be elucidated. Here, two COFs are developed with 2,5-diphenylthieno[3,2-]thiophene (DPTT) and 1,3,6,8-tetraphenylpyrene (Py) linked by imine, affording DPTT-Py-COF and Py-DPTT-COF, respectively. Distinctly, DPTT-Py-COF and Py-DPTT-COF have high crystallinity and porosity, paving the way to highly efficient photocatalysis. Theoretical calculations demonstrate that both DPTT-Py-COF and Py-DPTT-COF are of similar bandgaps but of varied energy positions due to the different orientations of imine. Besides, characterizations disclose that DPTT-Py-COF delivers more enhanced charge separation and transfer than Py-DPTT-COF. Probed by the oxidation of amine to imine, DPTT-Py-COF exhibits a blue light photocatalytic performance superior to that of Py-DPTT-COF. DPTT-Py-COF, a highly recyclable photocatalyst, enables the oxidation of various amines to imines with oxygen. This work highlights that tuning the microenvironment of COFs unravels tenable performances in photocatalysis.
对于可见光光催化,共价有机框架(COF)最近受到了越来越多的关注。应阐明亚胺连接的COF中亚胺不同取向对光催化的影响。在此,开发了两种由亚胺连接的2,5-二苯基噻吩并[3,2-b]噻吩(DPTT)和1,3,6,8-四苯基芘(Py)构成的COF,分别得到DPTT-Py-COF和Py-DPTT-COF。明显地,DPTT-Py-COF和Py-DPTT-COF具有高结晶度和孔隙率,为高效光催化铺平了道路。理论计算表明,DPTT-Py-COF和Py-DPTT-COF具有相似的带隙,但由于亚胺的不同取向,其能量位置不同。此外,表征结果表明,DPTT-Py-COF比Py-DPTT-COF具有更强的电荷分离和转移能力。通过胺氧化为亚胺的反应探究,DPTT-Py-COF表现出优于Py-DPTT-COF的蓝光光催化性能。DPTT-Py-COF是一种高度可回收的光催化剂,能够将各种胺与氧气氧化为亚胺。这项工作突出表明,调节COF的微环境可揭示光催化中可靠的性能。