A porous Zn()-coordination polymer based on a tetracarboxylic acid exhibiting selective CO adsorption and iodine uptake

A porous Zn( ii )-coordination polymer, namely {[Zn 2 (μ 8 -abtc)(betib)]·DMF} n ( 1 ), was solvothermally synthesized from 3,3′,5,5′-azobenzenetetracarboxylate (abtc 4− ) and 1,4-bis(2-ethylimidazol-1-yl)butane (betib) ligands and {[Zn 2 (μ 8 -abtc)(betib)]·H 2 O} n ( 2 ) was obtained through the immersion of 1 in methanol. Compounds 1 and 2 were structurally characterized via numerous techniques. Both compounds displayed a 3D porous framework with a 3,6-connected sqc5381 net. Compound 2a obtained at 140 °C from 2 exhibited gas and iodine adsorption properties. Interestingly, the compound adsorbed selectively CO 2 with the uptake capacity of 54.02 cm 3 g −1 (13.26%) over N 2 (5.43 cm 3 g −1 ) and CH 4 (14.53 cm 3 g −1 ) at 273 K. The compound also adsorbed iodine with the weights of 19.99% and 30.26% in solution and vapor phases, respectively. The single crystal X-ray result and Raman spectra showed the presence of iodine units in the pores of the framework. A 3D porous Zn( ii )-coordination polymer with a sqc5381 net adsorbed selectively CO 2 over N 2 and CH 4 at 273 K and also 19.99% and 30.26% iodine in solution and vapor phase. X-ray result and Raman spectra showed iodine units in the pores of framework.