Reactivity of Bioinspired Magnesium–Organic Networks under CO2 and O2 Exposure

Photosynthesis is the model system for energy conversion. It uses CO 2 as a starting reactant to convert solar energy into chemical energy, i.e., organic molecules or biomass. The first and rate-determining step of this cycle is the immobilization and activation of CO 2 , catalyzed by RuBisCO enzyme, the most abundant protein on earth. Here, we propose a strategy to develop novel biomimetic two-dimensional (2D) nanostructures for CO 2 adsorption at room temperature by reductionist mimicking of the Mg-carboxylate RuBisCO active site. We present a method to synthesize a 2D surface-supported system based on Mg 2+ centers stabilized by a carboxylate environment and track their structural dynamics and reactivity under either CO 2 or O 2 exposure at room temperature. The CO 2 molecules adsorb temporarily on the Mg 2+ centers, producing a charge imbalance that catalyzes a phase transition into a different configuration, whereas O 2 adsorbs on the Mg 2+ center, giving rise to a distortion in the metal-organic bonds that eventually leads to the collapse of the structure. The combination of bioinspired synthesis and surface reactivity studies demonstrated here for Mg-based 2D ionic networks holds promise for the development of new catalysts that can work at room temperature.