Prix et distinctions
FRE IMAP 2000 : Institut des Matériaux Poreux de Paris
Nature Materials, 19 décembre 2016
Selective dinitrogen binding to transition metal ions mainly covers two strategic domains: biological nitrogen fixation catalysed by metalloenzyme nitrogenases, and adsorptive purification of natural gas and air. Many transition metal–dinitrogen complexes have been envisaged for biomimetic nitrogen fixation to produce ammonia. Inspired by this concept, herewe report mesoporous metal–organic framework materials containing accessible Cr(III) sites, able to thermodynamically capture N2 over CH4 and O2. This fundamental study integrating advanced experimental and computational tools confirmed that the separation mechanism for both N2/CH4 and N2/O2 gas mixtures is driven by the presence of these unsaturated Cr(III) sites that allows a much stronger binding of N2 over the two other gases. Besides the potential breakthrough in adsorption-based technologies, this proof of concept could open newhorizons to address several challenges in chemistry, including the design of heterogeneous biomimetic catalysts through nitrogen
Miniaturization of metal–organic frameworks (MOFs) results of great interest in order to integrate these materials in strategic applications such as sensing or drug delivery. This emerging class of nanoscaled MOFs (nanoMOFs), combining the intrinsic properties of the porous materials and the benefits of nanostructures, are expected to improve in some cases the performances of classical bulk crystalline MOFs. In the field of biomedicine, the benefits of MOF miniaturization have already been proved to be effective, not only because establishes a strong influence over the choice of the administration route but also governs their in vivo fate and therefore, their toxicity and/or activity.