Syntheses, structures, photoluminescence, and magnetism of a series of 3,5-di(3,4-dicarboxylphenyloxy)benzoate-based complexes tuned by N-donor co-ligands and transition metal ions.

Graphical abstract Six metal polycarboxylate complexes tuned by N-donor co-ligands and transition metal ions have been successfully synthesized and structurally characterized. The photoluminescent and magnetic properties of partial complexes were studied. Abstract Six transition metal–organic complexes based on 3,5-di(3,4-dicarboxylphenyloxy)benzoic acid (H 5 L) and different N-donor co-ligands, namely, Cu(H 3 L)(2,2′-bpy)·H 2 O (1), Zn 2 (HL)(2,2′-bpy) 2 (2), Cd 2 (HL)(2,2′-bpy) 2 (H 2 O) (3), Cd 2 (HL)(phen) 4 ·5H 2 O (4), Cu(H 3 L)(phen) (5), and Cu(H 3 L)(4,4′-bpy)·H 2 O (6) (2,2′-bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline, 4,4′-bpy = 4,4′-bipyridine), were successfully synthesized under hydrothermal conditions. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR, powder X-ray diffraction (PXRD), and thermogravimetric analyses (TGA). Complexes 1 and 5 possess discrete zero-dimensional (0D) structures which are further assembled into three-dimensional (3D) supramolecular frameworks by hydrogen-bonding interactions and π–π stacking interactions. Complexes 2 and 3 display similar 3D frameworks with different topologies. Complex 4 shows a one-dimensional (1D) chain which is further connected into a two-dimensional (2D) supramolecular layer via π–π stacking interactions. Complex 6 exhibits a 1D chain which is further extended into a 3D supramolecular network through hydrogen-bonding interactions. The H 5 L ligand is partially deprotonated in 1 – 6. The N-donor co-ligands and transition metal ions have important effects on the architectures of 1 – 6. The photoluminescent properties of 2 – 4 and the magnetic properties of 1 and 6 were also studied. [ABSTRACT FROM AUTHOR]