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Solvothermal reactions of aromatic 1,1'-ethynebenzene-3,3',5,5'-tetracarboxylic acid (H 4 EBTC) and Mg 2+ salts in the presence of different supporting ligands afforded the coordination polymers [Mg(H 2 EBTC)(DMF) 2 (H 2 O) 2 ] (1), [Mg 3 (HEBTC) 2 (H 2 O) 4 ]·solvent (2) and [Mg 2 (EBTC)(H 2 O) 5 ]·solvent (3). The crystal structures of 1-3 were determined by the single crystal X-ray diffraction technique, where CP 1 showed a one-dimensional zigzag MgO 6 coordination octahedral chain structure; 2 exhibited a two-dimensional MgO 6 coordination octahedral framework with trinuclear [Mg 3 (COO) 6 ] SBUs, and 3 featured a three-dimensional MgO 6 coordination octahedral framework with binuclear [Mg 2 O(COO) 2 ] SBUs. The various structures in CPs 1-3 of Mg 2+ ions with the H 4 EBTC ligand were ascribed to the conformational flexibility and the coordination mode diversity of the H 4 EBTC ligand. Interestingly, the zwitterionic supporting ligand 2-aminoterephthalic acid or 4-aminobenzenesulphonic acid played a vital role in the initial formation process of nuclear crystals but only as a structural induction agent, which modulated the dimensionality of these Mg 2+ -based CPs. Additionally, the three CPs emitted bright blue luminescence at ambient conditions, and the emission lifetimes and absolute quantum yields were also investigated.

rsc advances

Dimensionality of luminescent coordination polymers of magnesium ions and 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylic acid modulated by structural inducing agents