Stacked Covalent Organic Ribbons Perpendicular to Graphene Oxide Sheets; a 1D‐p‐2D Design for Photocatalytic Tandem Reactions

Abstract

Development of one dimensional covalent organic frameworks (1D‐COFs) with potential in light absorption and catalysis is still challenging, due to their rapid interpenetration to form 2D and 3D porous structures. Here we report a successful synthesis of imine‐linked 1D covalent organic ribbons (COR), using two simple linear building blocks 1,4‐Benzenediamine (Bda) and [2,2'‐Bipyridine]‐5,5'‐dicarbaldehyde (Bpy). The obtained 1D structure with nanorod morphology could keep its physicochemical characteristic properties when it is perpendicularitated on the surface of graphene oxide (GO) sheets (1D‐p‐2D structure). Due to an AB π‐π stacking and efficient charge transfer between perpendicular 1D COR and GO sheets, the obtained nanocomposite showed strong visible light absorbance (400‐700 nm) with coefficient of 4.400 M‐1cm‐1 and decreased recombination rate of photogenerated reactive species by 92%. The strategy of 1D‐p‐2D light driven system greatly enhanced the photocatalytic activity in practical applications such as both oxidation and hydrogenation tandem reactions to a rate constant of higher than 0.02 min‐1. This study presents the first case of 1D covalent organic polymers grown perpendicularly on a carbon‐based layer for boosting electron mobility through the junction between the two components.