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. Fabrication of compact and dense porous metal–organic polyhedra (MOP) ultrathin films offers several advantages for the development of MOP‐based applications in gas separation. MOP‐supported membranes obtained by successive RhII‐based MOP monolayer deposition can be applied for efficient CO2 separation (see figure).