Ultrastable 3D cage-like metal-organic frameworks constructed using polydentate cyanurate ligands and their gas adsorption properties.

Stability is a key factor that restricts the practical applications of metal-organic framework (MOF) materials. In this work, we report an ultrastable three-dimensional cage-like MOF, SrCu(HC 3 N 3 O 3 ) 2 , constructed by a polydentate cyanurate ligand and two kinds of different metal nodes. A high ratio of coordination sites in organic ligands, specific coordination of strong acid with a strong base and weak acid with a weak base and double independent completed coordination networks endow SrCu(HC 3 N 3 O 3 ) 2 with outstanding thermal stability (up to 300 °C) and acid/alkali resistance (pH = 2-14). Moreover, SrCu(HC 3 N 3 O 3 ) 2 possesses the highest porosity up to 36.7% among cyanuric acid-based MOF materials and exhibits differentiated adsorption of C 3 H 4 (63 cm 3 g -1 ) and C 3 H 6 (51 cm 3 g -1 ). The breakthrough experiment further verified that efficient C 3 H 4 /C 3 H 6 separation can be achieved under dynamic conditions by SrCu(HC 3 N 3 O 3 ) 2 .