Three new metal–organic frameworks constructed from triazol-phenyl polycarboxyl acid: Synthesis, crystal structures and properties

Three new metal–organic frameworks (MOFs), formulated as [Cd(tia)(H2O)2]n (1), [Cu(tia)(H2O)2]n (2) and {[Zn3(ctia)2·(H2O)8]·2H2O}n (3) (tia2− = 5-(1H-1,2,3-triazol-1-yl) isophthalate, ctia3− = 5-(4-carboxylato-1H-1,2,3-triazol-1-yl) isophthalate) have been synthesized under hydrothermal conditions and characterized. Single-crystal X-ray diffraction analysis reveals that complexes 1 and 2 show similar common 2D (6, 3) topology network layers and these layers are further connected by H-bonding interactions to form 3D supermolecular structures. Complex 3 displays a unique 1D ladder-like chain structure, in which parallel arrangements of Zn1 coordination chains are linked by SBUs (SBUs: Secondary Building Units) containing the Zn2 center. Magnetic measurements in the range 2–300 K have shown antiferromagnetic interactions among the adjacent copper ions in complex 2. Complexes 1 and 3 exhibit strong luminescent emissions in the solid state at room temperature.

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► Three new metal–organic frameworks were synthesized and characterized.
► The SBUs bridge two parallel Zn coordination chains to afford a unique 1D ladder-like chain structure in complex 3.
► There is a stronger luminescent emission in compounds 1 and 3 compared to the free ligand.
► There are antiferromagnetic interactions among the adjacent copper ions in complex 2.