4.6 Article

Two Polynuclear Manganese(II) Complexes Based on Multidentate N-Heterocyclic Aromatic Ligand and V-Shaped Polycarboxylate Ligand: Synthesis, Crystal Structure Analysis and Magnetic Properties

Journal

CRYSTALS
Volume 12, Issue 2, Pages -

Publisher

MDPI
DOI: 10.3390/cryst12020278

Keywords

manganese(II) coordination polymer; ionic liquid; self-threading; magnetism

Funding

  1. National Natural Science Foundation of China [21971100]
  2. Key Scientific Research Projects of Higher Education of Henan Province [20A150005]

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Two complexes were obtained through the reaction of MnCl2 with different ligands, which were well characterized by various analytical methods. The structure of complex 1 includes 2D layers and a 3D supramolecular network, while complex 2 exhibits a self-threading structure and 2D layers. The magnetic studies indicate that the magnetic interactions in both complexes are mainly due to antiferromagnetic coupling.
The reaction of MnCl2, 2-(5-{6-[5-(Pyrazin-2-yl)-1H-1,2,4-triazol-3-yl]pyridin-2-yl}-1H-1,2,4-triazol-3-yl)pyrazine (H(2)ptptp), 4,4 '-sulfonyldibenzoic acid (H(2)sdba) or 4-(4-carboxyphenoxy)phthalate acid (H(3)cpop) and [BMI]Br ionic liquids (BMI = 1-butyl-3-methylimidazolium) gave rise to two complexes, {[Mn-4(ptptp)(2)(sdba)(2)(H2O)(2)]center dot 2H(2)O}(n) (1) and {[Mn-3(ptptp)(cpop)Br(H2O)(2)]center dot 2H(2)O}(n) (2). The compounds have been well characterized by elemental analysis, IR spectra, thermogravimetric analysis, as well as single-crystal and powder X-ray diffraction. The structure feature of 1 is that Mn(II) ions in the [Mn-6(sdba)(2)] loops of V-shaped sdba(2-) ligands are ptptp(2-) ligands, respectively, and a 2D layer is constructed from sdba(2-) and ptptp(2-) ligands. The adjacent 2D layers are connected by O-HMIDLINE HORIZONTAL ELLIPSISN hydrogen bonds to form a 3D supramolecular network. The neighbouring trinuclear Mn(II) clusters in 2 are linked by V-shaped cpop(3-) ligands to give a 2D layer, which is penetrated by ptptp(2-) ligands to form self-threading structure. The results of variable-temperature magnetic studies have shown that the magnetic interactions between the Mn(II) ions in 1 and 2 are mainly due to antiferromagnetic coupling.

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