Covalent Organic Frameworks for the detection of CO

Abstract

International audienceEvery year in the world, carbon monoxide (CO) is responsible for thousands of intoxications and hundreds of deaths. The detection (CO) at few ppm levels is thus a critical point for the control of the air quality. Corrole belongs to the family of porphyrinoids which is largely used for sensing applications [1]. We have shown that cobalt metallocorroles are able to bind carbon monoxide in the axial position with a high affinity even in the presence of nitrogen and dioxygen, the two main components of the atmosphere [2]. We have recently prepared sensing devices for low CO detection level (sub-ppm) using cobalt corroles deposited as films on a Surface Acoustic Wave device by spray coating [3]. Herein, we will describe the synthesis of new porous materials belonging to the Covalent Organic Frameworks (COF) family based on cobalt corroles (Figure 1). The two axial NH3 molecules can be easily removed to give the tetracoordinated cobalt corroles, as active species. Their synthesis and selective sorption properties for CO over N2 and O2 will be presented