Abstract
Four novel coordination polymers (CPs) based on a new 4-(3,5-dicarboxylphenyl) picolinic acid ligands (H3L), [M3(L)2(H2O)6]·4H2O (M3 = Mn3, 1; Co3, 2; Ni3, 3, Co1.01Ni1.99, 4), have been hydrothermally synthesized, and structurally and magnetically characterized. In these isomorphous CPs, octahedrally coordinated metal ions are linked by the single syn–anti carboxylate bridge (μ-COO) to give linear trinuclear motifs. The motifs are connected through the other single syn–anti carboxylate bridge (μ-COO) to give a 2D (4,4) layer, and the layers are interlinked by the L ligands into 3D frameworks. Magnetic measurement indicates that antiferromagnetic interactions between metal ions are mediated through the single syn–anti carboxylate bridges in 1 and 2, while the same carboxylate bridges in 3 transmit ferromagnetic couplings. The bimetallic CP 4 shows interesting complicated magnetic behaviors due to the competition effect of Co(ii) and Ni(ii) ions.
Highlights
Research efforts on metal–organic frameworks (MOFs) or coordination polymers (CPs) have disclosed great versatile multifunctional materials with fascinating structures and promising properties.[1,2,3] Such multifunctional materials have displayed excellent potential applications in the eld of gas storage,[4,5] catalysis,[6,7] uorescence,[8,9] and magnetism.[10,11] The general strategy to design CPs is to use organic ligands to connect metal ions or clusters into polynuclear clusters or polymeric networks
CPs 1–4 were all synthesized by the hydrothermal reaction of MCl2$nH2O (n 1⁄4 4 or 6) and H3L
A er the literature research, we found that the single carboxylate bridges in the Mn(II) compounds always induce antiferromagnetic interactions
Summary
Research efforts on metal–organic frameworks (MOFs) or coordination polymers (CPs) have disclosed great versatile multifunctional materials with fascinating structures and promising properties.[1,2,3] Such multifunctional materials have displayed excellent potential applications in the eld of gas storage,[4,5] catalysis,[6,7] uorescence,[8,9] and magnetism.[10,11] The general strategy to design CPs is to use organic ligands to connect metal ions or clusters into polynuclear clusters or polymeric networks. The choice of metal ions and organic linkers with speci c coordination preferences is crucial to construct CPs through serendipitous synthesis or rational design In this context, multi carboxylate ligands have been among the most extensively used ligands owing to their versatile and diverse in both coordination chemistry and magnetism.[12,13,14,15] For instance, the carboxylate groups can bind two or more metal ions in various bridging modes, such as syn–syn, syn–anti, and anti–anti. Multi carboxylate ligands have been among the most extensively used ligands owing to their versatile and diverse in both coordination chemistry and magnetism.[12,13,14,15] For instance, the carboxylate groups can bind two or more metal ions in various bridging modes, such as syn–syn, syn–anti, and anti–anti They can form strong hydrogen bonds in favor of the formation of extended supramolecular structures and reinforcement the coordination networks. The p-conjugated rigid backbone and the tetratopic connectivity would lead to some new features in the coordination
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