International audienceDetection of carbon monoxide (CO) at few ppm levels is a critical point for quality control of domestic and<br>industrial environment. CO is responsible for thousands of intoxications and hundreds of deaths per year in the<br>world. Moreover, CO is a residual gas found in the industrial dihydrogen used for Proton Exchange Membrane<br>fuel cell, and deactivates the fuel cell prematurely. Corroles have been largely used in sensing applications.[1]<br>Cobalt corroles display high binding affinity for carbon monoxide even in the presence of nitrogen and<br>dioxygen.[2] The affinity of the Co(III) metallocorroles for CO is directly correlated with the Lewis acid character<br>of the metal center. Therefore, structural modifications on the aromatic ring have a direct influence on the<br>reactivity of the metal complex. We have recently obtained very low CO detection level (ppm) using SAW<br>devices functionalized by cobalt corrole deposited as a film on an alumina or a gold surface.[3] Our previous work<br>on the synthesis of porous sol-gel materials functionalized by cobalt corroles gave us encouraging results for CO<br>sorption and detection[4] and prompted us to prepare new porous structured materials functionalized by corrole<br>complexes for gas detection applications. Among all the methods of synthesis of porous architectures, organic<br>materials belonging to the POP (Porous Organic Polymer) family are an appealing and original approach in this<br>research field.[5] Herein, we describe the synthesis of new POPs functionalized by cobalt corroles (Fig. 1). Their<br>selective sorption properties for CO over N2, O2 and CO2 will be also presented