Combined influence of hydrogen bonds and π–π interactions on the assembly of five manganese coordination polymers with magnetic properties

Abstract

Five novel interesting Mn(II) coordination polymers, [Mn₃(IDPA)₃(DMA)(H₂O)₂]_n·n[(H₂O)(DMA)] (1), [Mn(IDPA)(2,2′-bpy)(H₂O)]_n·2n(H₂O) (2), [Mn(IDPA)(phen)(H₂O)]_n (3), [Mn(IDPA)(bpa)_1/2(H₂O)₂]_n·n(H₂O) (4), and [Mn(IDPA)(4,4′-bpy)_1/2]_n (5) [H₂IDPA = 5-(1-oxoisoindolin-2-yl) isophthalic acid, bpy = bipyridine, bpa = 1,2-bis(4-pyridyl)ethane, phen = 1,10-phenanthroline, DMA = N,N-dimethylacetamide], have been synthesized with different N-donor ligands under solvothermal conditions and structurally characterized. The crystal structures of 1–5 illustrate that hydrogen bonds and π–π interactions play critical roles in the construction of the extended supramolecular architectures. Compound 1 possesses a two-dimensional (2D) layer structure with a uninodal 4-connected sql tetragonal plane net. Compounds 2–4 feature one-dimensional chain (1D) structures, which further extend to 2D supramolecular networks via intermolecular π–π interactions and hydrogen bonds. Compound 5 exhibits a most remarkable and unique three-dimensional (3D) framework with a binodal (4,5)-connected new topology with the Schläfli symbol of {4²·5²·6²}{4²·5³·6⁴·7}. Interestingly, the carboxylic groups of H₂IDPA display six different types of coordination modes in 1–5 and the steric bulk of H₂IDPA plays an important role in influencing the structures of its compounds. Compound 1 containing triangular trinuclear (Mn1⋯Mn2⋯Mn3) units displays weak antiferromagnetic interactions in the system, whereas compounds 2–5 show that the overall magnetic interactions among the Mn(II) ions are weakly ferromagnetic. Besides, the thermal stabilities and luminescence properties of 1–5 have also been investigated and discussed in detail.