Selective CO2 Capture and High Proton Conductivity of a Functional Star-of-David Catenane Metal–Organic Framework

Abstract

Network structures based on Star-of-David catenanes with multiple superior functionalities have been so far elusive, although numerous topologically interesting networks are synthesized. Here, a metal–organic framework featuring fused Star-of-David catenanes is reported. Two triangular metallacycles with opposite handedness are triply intertwined forming a Star-of-David catenane. Each catenane fuses with its six neighbors to generate a porous twofold intercatenated gyroid framework. The compound possesses exceptional stability and exhibits multiple functionalities including highly selective CO₂ capture, high proton conductivity, and coexistence of slow magnetic relaxation and long-range ordering.

A metal–organic framework, which represents the rare networks composed of Star-of-David catenanes, is designed. The structural complexity of the unique framework highlights different facets of the same compound. Remarkably, the material shows highly selective CO₂ capture for a molecular-sieving effect, superionic proton conductivity, and coexistence of slow magnetic relaxation and long-range ordering.

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