Structural Diversity of Four Metal–Organic Frameworks Based on Linear Homo/Heterotrinuclear Nodes with Furan-2,5-dicarboxylic Acid: Crystal Structures and Luminescent and Magnetic Properties

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Abstract

Four new homo- and heterometallic metal–organic frameworks (MOFs) based on linear homo/heterotrinuclear nodes, namely, {[NH2(CH3)2]2[Co3(FDA)4(CH3OH)2]}n (1), {[NH2(CH3)2]2[Co3(FDA)4]·2DMF}n (2), {[Gd2Co(FDA)4(H2O)4]·2H2O}n (3), and {[Dy2Co(FDA)4(glycol)2]·2H2O}n (4) (H2FDA = furan-2,5-dicarboxylic acid), were obtained under solvothermal conditions and characterized by single crystal X-ray diffraction, magnetic susceptibility, and luminescence measurements. The building blocks of four MOFs are linear trinuclear clusters stabilized by carboxylic groups, but the three-dimensional frameworks are different. MOFs 1 and 2 are both pcu nets with a point symbol of (412.63), whereas MOFs 3 and 4 exhibit 3,10T9 and tfz-d nets with the point symbols of (418.624.83)(43)2 and (43)2(46.618.84), respectively. Magnetic susceptibility measurements indicate that there are antiferromagnetic interactions in 1–3, while 4 displays interesting ferromagnetic interactions between Co(II) and Dy(III) ions. Luminescence investigation of 4 shows intense and characteristic emission bands of Dy(III) ions in the solid state.

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