Aqueous molecular sieving is demonstrated in a ne
w series of isostructural metal organic frame
works based on the perylene tetracarboxylate (PTC) ligand. The frame
works can be formed in
water at room temperature
with Mg, Ni, and other first ro
w transition metal ions and adopt a highly porous topology that results in predicted surface areas of over 2000 m
2 g
鈥? and periodic channels of around 6 脜 in diameter. Unusually, the M-PTC MOFs are highly resistant to moisture and can be readily synthesized on multigram scales. The frame
works have been sho
wn to exhibit molecular sieving in the absorption from mixtures of organic molecules at lo
w aqueous concentrations,
with an application demonstrated on a dangerous
water-borne herbicide, Paraquat. Ni-PTC also exhibits a structural flexibility that leads to strong and selective gas adsorption characteristics,
with an IAST selectivity of 300 for carbon dioxide being adsorbed over nitrogen. Binding enthalpies for hydrogen and carbon dioxide are also very strong in comparison to other MOFs, at 10.75 and 52.50 kJ/mol respectively.
Keywords:
work&qsSearchArea=searchText">metal organic framework; MOF; carbon dioxide capture; hydrogen storage; molecular sieving; capture of toxins