Selective Adsorption of Water, Methanol, and Ethanol by Naphthalene Diimide-Based Coordination Polymers with Constructed Open Cu 2+ Metal Sites and Separation of Ethanol/Acetonitrile.

The selective separation of ethanol/acetonitrile by porous materials has rarely been observed owing to their similar physicochemical properties. In this work, we report a new coordination network, [Cu ₂ (4-pmntd) ₂ (opd) ₂ ](4-pmntd = N , N '-bis(4-pyridymethy)naphthalene diimide, opd = disodium 1,2-benzenedicarboxylate), which exhibits selective separation of ethanol over acetonitrile. The weak coordination bonds formed by unsaturated Cu ²⁺ sites and hydroxyl groups are the key to such performance.
Competing Interests: The authors declare no competing financial interest.