Three-dimensional pillared-layer metal-organic framework based on single bifunctional organic ligand.

One new type of 3D pillared-layer MOF has been synthesized based on single organic linker with high adsorption capabilities for various hydrocarbon gas and promising CO 2 /CH 4 selectivity. • One new type of 3D pillared-layer framework was prepared by using single indazole-carboxyl liand. • The organic connects metal trimer into 2D layer and further bridges 2D layer resulting in 3D framework. • The unique framework architecture displays high gas adsorption and promising CO 2 /CH 4 selectivity. Herein, by well-designing one bifunctional organic ligand as distinct bridging nodes, one new three-dimensional (3D) pillar-layer MOF, namely as Co 3 (IDCA) 4 (IDCA = 1-H-indazole-5-carboxyle acid), has been synthesized and structurally characterized. The 3D Co 3 (IDCA) 4 framework is composed of linear metal trimer and parazole-carboxyl group with one-dimensional (1D) tetragonal channel. Despite of absence of open metal sites as molecule binding positions, this 3D framework displays promising uptake capacity and separation ability for various hydrocarbon gas molecules. [ABSTRACT FROM AUTHOR]