Porous NbO-type metal-organic framework with inserted acylamide groups exhibiting highly selective CO2 capture

A new expanded microporous NbO-type metal-organic frame-work [Cu-2(BDPT4-)](n) with inserted acylamide groups has been designed and synthesized, which shows both a large CO2-uptake capacity (156.4 cm(3) g(-1) at 1 bar) and a high selectivity for CO2 over N-2 (39.8) and CH4 (7.2) at 273 K.