Ultrathin films of porous metal–organic polyhedra for gas separation

Ultrathin films of a robust RhII‐based porous metal–organic polyhedra (MOP) have been obtained. Homogeneous and compact monolayer films (ca. 2.5 nm thick) were first formed at the air–water interface, deposited onto different substrates and characterized using spectroscopic methods, scanning transmission electron microscopy and atomic force microscopy. As a proof of concept, the gas separation performance of MOP‐supported membranes has also been evaluated. Selective MOP ultrathin films (thickness ca. 60 nm) exhibit remarkable CO2 permeance and CO2/N2 selectivity, demonstrating the great combined potential of MOP and Langmuir‐based techniques in separation technologies.This work was supported by the Spanish MINECO (projects RTI2018‐095622‐B‐I00, MAT2016‐78257‐R, MAT2016‐77290‐R and MAT2017‐86826‐R), the Catalan AGAUR (project 2017 SGR 328), the ERC under the EU‐FP7 (ERC‐Co 615954), the CERCA Program/Generalitat de Catalunya and the Aragon Government (T43_17R and E31_17R research groups). ICN2 is supported by the Severo Ochoa program from Spanish MINECO (SEV‐2017‐0706). A.C.‐S. thanks the Spanish MINECO for Juan de la Cierva fellowship (IJCI‐2016‐29802), J. S.‐L. and M.A.A thank the Spanish Education Ministry Program FPU2014 for their Ph.D. grants.Peer reviewe