A robust etb-type metal-organic framework showing polarity-exclusive adsorption of acetone over methanol for their azeotropic mixture.

We report a robust and rigid etb-type metal-organic framework, in which its pore surface is decorated with flexible ethoxyl groups. It shows unprecedentedly selective adsorption of acetone (E value of 0.355, kinetic diameter of 4.6 Å) over methanol (E value of 0.762, kinetic diameter of 3.6 Å) for their azeotropic mixture.