Syntheses, topological structures and properties of six metal–organic frameworks constructed from a flexible tetracarboxylate ligand

Abstract

Six new metal–organic frameworks (MOFs), Co₂O(odip)(py)₂(DMSO)₂·3H₂O (1), Co₂(odip)(H₂O)(DMA)₂·2DMA (2), Co₄(odip)₂(H₂O)₄(DMSO)₂·5DMSO (3), [Zn₂(odip)(DMF)₂(H₂O)]·2DMF·2H₂O (4), Zn₂(odip)(H₂O) (5) and In(odip)·3ACN (6), have been synthesized from the 5,5′-oxydiisophthalic acid (H₄odip) ligand under solvothermal conditions. These six compounds were characterized by single-crystal X-ray diffraction, power X-ray diffraction and relative physical methods. MOFs 1, 2 and 3 are constructed from the same ligand and metal-salt under the same temperature, but with different solvents, and they exhibit three different topologies. MOF 1 possesses a 3D 4-coordinated architecture with a (6⁵·8) topology. MOF 2 features a 3D 4-coordinated net with a (4²·6³·8) topology and MOF 3 shows a 3D 4-coordinated framework with a (4·6⁴·8)(4·6⁵) topology. MOFs 4 and 6 have the same topology as MOF 2. MOF 5 exhibits a 3D 5-coordinated framework with a (4⁴·6⁶) topology. These results indicate that the solvent environment plays an important role in the formation of the final framework. Moreover, the photoluminescence properties of 4 and 5, and the magnetic properties of 1, 2 and 3 have been studied and discussed.