Synthesis,crystal structure,and luminescent property of two novel Zn/Co(II) coordination polymers with a linear bis-imidazole and dicarboxylate ligands

The linear linker 1,3-bis(2-methylimidazolyl)propane (Bmip) has been used to construct two new coordination polymers with Zn²⁺ and Co²⁺ ions and carboxylate donor ligand viz., 4,4’-oxydibenzoic acid (H₂Oba). Compounds formed hydrothermally are [Zn(Bmip)(Oba)] _n (Ι), [Co(Bmip)(Oba)] _n (II). Complexes Ι and II have been characterized by single crystal X-ray diffraction (CIF files CCDC nos. 1033354 (I), 1001813 (II)), IR spectroscopy, thermogravimetry, elemental analysis and powder X-ray diffraction. Single crystal X-ray analysis revealed that complexes Ι and II are isostructural, which exhibit 2D 4⁴-sql net. And the adjacent 4⁴-sql net are further inforced through weak noncovalent C–H···π and H-bonding to form a 3D supramolecular framework. Furthermore, the photoluminescence property of complexes Ι and II in the solid state at room temperature was also investigated.