Syntheses, structures of manganese/cadmium/ferrous complexes and magnetic property of manganese complex with the ligand 5-hydroxynicotinic acid

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Abstract

Three new coordination polymers, namely [Mn2(5-phenoxonicotinato)2] (1), [Cd2(5-phenoxonicotinato)2] (2), and [Fe2(5-phenoxonicotinato)2] (3), have been synthesized under hydrothermal conditions and characterized structurally by single-crystal X-ray diffraction. The structure of compound 1 can be described as a 3D metal-organic framework which is constructed by two kinds of crystallographical unique Mn cations and one kind of μ6-5-phenoxonicotinato bridging ligand, featuring a 6,6-connected {3·410·64}{49·66} topology structure. Taking Cd and Fe ions in place of Mn ions respectively, two new compounds 2 and 3 are successfully obtained which are isostructural with 1. In addition, the magnetic property of compound 1 is investigated in detail.

Graphical abstract

Three new 3D coordination polymers, [M(II)2(5-phenoxonicotinato)2]n, (M = Mn 1, M = Cd 2, and M = Fe 3) constructed by two kinds of structurally independent metal ions with one kind of μ6-5-phenoxonicotinato bridge are isostructural and exhibit a novel 6,6-connected {3·410·64}{49·66} topology structure. The study on magnetic property of compound 1 reveals that antiferromagnetic interactions exist between the neighboring Mn(II) ions.

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Research Highlights

► 5-hydroxynicotinic acid can coordinate with Mn(II)/Cd(II)/Fe(II) ions directly forming 3D MOFs. ► The three 3D MOFs exhibit a novel 6,6-connected {3·410·64} {49·66} topology structure. ► The stratagem for synthesizing the three 3D MOFs simplifies crystal engineering. ► Compound 1 reveals antiferromagnetic interactions between the neighboring Mn(II) ions.

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