A microporous coordination polymer of 2,6-Naphthalenedicarboxylate and cobalt(II) showing reversible structural and functional transformation

A three-dimensional microporous coordination polymer with weakly coordinating solvate molecules, Co2(H2O)4(2,6-NDC)2(DMF)2·2H2O, 1, have been synthesized. The metal-organic framework 1 can undergo a structural transformation when the solvent molecules are removed, which is followed by the modulation of physical properties. This crystal-to-crystal transformation is reversible, and associated with a significant magnetic-susceptibility change: dropping the Curie constant from 5.947 cm3 K to 5.535 cm3 K and elevating the Weiss temperature from −65.3 K to −7.5 K when the solvent molecules are removed. The absorption properties of the desolvated 1 were studied for N2 and Ar, and some preference were found most probably due to the small pore sizes in the material.

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► Synthesis and structure of a microporous complex Co2(H2O)4(2,6-NDC)2(DMF)2·2H2O.
► Selective absorption properties of microporous structure.
► Crystal-to-crystal reversible structural and functional transformation.