Syntheses, Crystal Structures, and Magnetic Properties of Mn(Ⅱ) and Co(Ⅱ) Coordination Polymers Constructed from Pyridine-tricarboxylate Ligand

【摘要】 Two coordination polymers, namely {[Mn（HL₁）（phen）]·4H₂O}_n（1） and [Co₂（HL₂）₂（H₂O）₂]_n（2） have been constructed hydrothermally using H₃L₁ and H₃L₂（H₃L₁ = 2-（5-carboxypyridin-2-yl）terephthalic acid, H₃L₂ = 2-（4-carboxypyridin-3-yl）terephthalic acid）, phen, MnCl₂×4H₂O and CoCl₂×6H₂O. The products were isolated as stable crystalline solids and were characterized by IR spectroscopy, elemental, thermogravimetric（TGA）, powder（PXRD） and single-crystal X-ray diffraction analyses. Compound 1 features a 3D framework structure, which was topologically classified as a trinodal 4,6,6-connected net with the unique topology defined by the point symbol of(3¹⁰.5.6⁴)4(3¹⁰.6.7⁴)2（5.6².8².9）. Compound 2 possesses a 2D metal-organic layer, which was topologically classified as a binodal 4,4-connected layer defined by the point symbol of（4³.6².8）. The layers are further extended into a 3D supramolecular framework via hydrogen bonds. The magnetic properties for both compounds were also investigated, indicating antiferromagnetic interactions between the adjacent metal ions.更多还原

【Abstract】 Two coordination polymers, namely {[Mn（HL₁）（phen）]·4H₂O}_n（1） and [Co₂（HL₂）₂（H₂O）₂]_n（2） have been constructed hydrothermally using H₃L₁ and H₃L₂（H₃L₁ = 2-（5-carboxypyridin-2-yl）terephthalic acid, H₃L₂ = 2-（4-carboxypyridin-3-yl）terephthalic acid）, phen, MnCl₂×4H₂O and CoCl₂×6H₂O. The products were isolated as stable crystalline solids and were characterized by IR spectroscopy, elemental, thermogravimetric（TGA）, powder（PXRD） and single-crystal X-ray diffraction analyses. Compound 1 features a 3D framework structure, which was topologically classified as a trinodal 4,6,6-connected net with the unique topology defined by the point symbol of(3¹⁰.5.6⁴)4(3¹⁰.6.7⁴)2（5.6².8².9）. Compound 2 possesses a 2D metal-organic layer, which was topologically classified as a binodal 4,4-connected layer defined by the point symbol of（4³.6².8）. The layers are further extended into a 3D supramolecular framework via hydrogen bonds. The magnetic properties for both compounds were also investigated, indicating antiferromagnetic interactions between the adjacent metal ions.更多还原