Hydrothermal Syntheses, Crystal Structures, and Properties of 1D Coordination Polymers Based on 5-Nitroisophthalic Acid and 1- Methylimidazole Linkers

Abstract

Two new coordination polymers, namely [Mn(μ3-5-nip)(1-meim)2(H2O)]n (1) and{[Co(μ-5-nip)(1-meim)3]∙H2O}n (2) (5-nip: 5-nitroisophthalate, 1-meim: 1-methylimidazole),were hydrothermally synthesized and characterized by FTIR spectroscopy, elemental analysis,single crystal X-ray diffraction, and simultaneous thermal analysis techniques. The 5-nip ligandexhibited two different coordination modes in its structures. In 1 and 2, 1D chains weregenerated by 5-nip ligands and metal(II) ions. In 1 and 2, 5-nip ligand coordinated to threeMn(II) and two Co(II) ions as bis(monodentate) bridging mode and a monodentate and bidentatechelating modes, respectively. For 1 and 2, 2D supramolecular layers were formed by hydrogenbonds which were extend into 3D supramolecular structures via π···π stacking interactionsbetween two symmetry–related imidazole rings of neighboring molecules. Furthermore, opticaland thermal properties of the complexes were also studied.