Two zinc(II) coordination polymers based on a benzenedicarboxylic acid derivative: Synthesis, crystal structures and luminescent properties

Two new coordination polymers, {[Zn3L2.5(μ3-OH)(H2O)3]·4H2O}n (1) and [Zn2L1.5(μ3-OH)(4,4′-bpy)0.5]n (2) (H2L = 2,5-bis(4-methylbenzoyl)terephthalic acid, 4,4′-bpy = 4,4′-bipyridine), have been hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, TG, PXRD and single crystal X-ray diffraction. Complex 1 possesses a 2D double-layer configuration with 48·62 network constructed with trinuclear zinc(II) clusters and L2− ligands, which extends into a 3D architecture via O–H···O interactions between coordinated water molecules and lattice water molecules. Complex 2 is a uninodal 8-connected 3D framework with a 424·64 network based on tetranuclear zinc(II) clusters as nodes. Moreover, the luminescent properties of complexes 1 and 2 were also investigated.