Synthesis, structures and adsorption properties of two new magnesium coordination polymers

Two new magnesium coordination polymers, [Mg(9,10-ADC)(H2O)2(DMF)2]n(1) and [Mg6(1,4-NDC)5(HCO2)4(DMF)(H2O)]n·2n[H2N(CH3)2]·2n(DMF) (2) (9,10-ADC = 9,10-anthracenedicarboxylate; 1,4-NDC = 1,4-naphthalenedicarboxylate) have been solvothermally synthesized. Compound 1 displays a one-dimensional linear chain structure, which is orderly constructed from magnesium metal cations connecting with carboxylic oxygen atoms of 9,10-H2ADC along the a axis. Compound 2 exhibits a three-dimensional framework composed of infinite chains of corner-sharing octahedral MgO6 with 1,4-NDC ligands forming one-dimensional channels along the a axis, where guest molecules reside. When guest molecules are removed, no structural transformation is found to occur, generating a robust structure with permanent porosity. The studies of CO2 absorption suggest that compound 2 is a promising adsorbent material for CO2.

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► Two magnesium coordination polymers were prepared.
► Compound 1 adopts a one-dimensional linear chain structure.
► Compound 2 exhibits a three-dimensional Porous structure.
► Compound 2 is a good adsorbent material for CO2.