Abstract
Co(II)/Zn(II) nitrates react with 3,5-bis(4-carboxybenzyloxy)benzoic acid (H3L) to afford three coordination polymers, [Co2(μ3-OH)(L)(H2O)]n·nH2O (1), [Co3(μ3-OH)2(HL)2(H2O)4]n·nbpmp (2) and [Zn2(μ3-OH)(L)]n (3) (bpmp = 1,4-bis(4-pyridylmethyl)piperazine). These compounds are characterized by elemental analysis, infrared spectra, thermogravimetry and single crystal X-ray structural analysis. Three coordination polymers contain μ3-hydroxide metal clusters. Coordination polymer 1 is a 3D porous metal–organic framework (MOF) containing tetranuclear cluster [Co4(µ3-OH)2(μ2-COO)4(μ3-COO)2]. Coordination polymer 2 shows a 1D ribbon structure constructing from trinuclear cluster [Co3(µ3-OH)(μ2-COO)2] and Y-shaped HL2− ligand. Coordination polymer 3 is a 3D porous MOF containing tetranuclear cluster [Zn4(µ3-OH)2(μ2-COO)6] with 23.7 % porosity. Cobalt coordination polymers 1 and 2 exhibit dominant antiferromagnetic coupling (Weiss constant θ = − 40 K), accompanied by ferromagnetic interactions at low temperature.
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