A Robust Binary Supramolecular Organic Framework (SOF) with High CO_2 Adsorption and Selectivity

摘要

A robust binary hydrogen-bonded supra-molecular organic framework (SOF-7) has been synthesized by solvothermal reaction of l,4-bis-(4-(3,5-dicyano-2,6-dipyridyl)dihydropyridyl)benzene (1) and 5,5'-bis-(azanediyl)-oxalyl-diisophthalic acid (2). Single crystal X-ray diffraction analysis shows that SOF-7 comprises 2 and l,4-bis-(4-(3,5-dicyano-2,6-dipyridyl)pyridyl)benzene (3); the latter formed in situ from the oxidative dehydrogen-ation of 1. SOF-7 shows a three-dimensional four-fold interpenetrated structure with complementary O-H···N hydrogen bonds to form channels that are decorated with cyano and amide groups. SOF-7 exhibits excellent thermal stability and solvent and moisture durability as well as permanent porosity. The activated desolvated material SOF-7a shows high CO_2 adsorption capacity and selectivity compared with other porous organic materials assembled solely through hydrogen bonding.