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

Four new homo- and heterometallic metal-organic frameworks (MOFs) based on linear homo/heterotrinuclear nodes, namely, {[NH2(CH3)(2)](2)[Co-3(FDA)(4)-(CH3OH)(2)]}(n) (1), {[NH2(CH3)(2)](2)[CO3(FDA)(4)]center dot 2DMF}(n) (2), {[Gd2Co(FDA)(4)(H2O)(4)]center dot 2H(2)O}(n) (3), and {[Dy2Co-(FDA)(4)(glycol)(2)]center dot 2H(2)O}(n) (4) (H(2)FDA = 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 (4(12).6(3)), whereas MOFs 3 and 4 exhibit 3,10T9 and tfz-d nets with the point symbols of (4(18).6(24).8(3))(4(3))(2) and (4(3))(2)(4(6).6(18).8(4),) 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.