Keele Research Repository

A CdII-based metal-organic framework (MOF) demonstrates that incorporation of a ligand with high-connectivity yields a material with remarkable hydrolytic stability that is able to capture CO2 un-der simulated industrial flue gas conditions. A novel triaminepenta-carboxylic acid ligand, isolated as its trihydrochloride salt N,Nʺ-di(4-carboxybenzyl)-N,N′,Nʺ-tri(acetic acid)-2,2′-diaminodiethylamine trihydrochloride (H8L1)Cl3, has been pre-pared, characterised and subsequently used in the formation of poly-[Cd2.5(L1)(OH2)]·DMF·4H2O, a highly connected three-dimensional network, with 12 out of 13 donor atoms coordinating per ligand. After solvent exchange it was found that 1 absorbed 170 cm3(STP)/g of N2 at 77 K and 66 cm3(STP)/g of CO2 at 273 K. Hydrolytic experiments performed on 1 demonstrated that the ma-terial completely retained crystallinity after being immersed in boil-ing water for 72 hours, as well as after being exposed to a simulat-ed flue gas stream at 150 °C.