Hydrothermal Synthesis, 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 IR spectroscopy, elemental analysis, single crystal diffraction and simultaneous thermal analysis techniques. The 5-nip ligand exhibited two different coordination modes in its structures. In 1 and 2, 1D chains were generated by 5-nip ligands and metal (II) ions. In 1 and 2, 5-nip ligand coordinated to three Mn(II) and two Co(II) ions as bis(monodentate) bridging mode and a monodentate and bidentate chelating modes, respectively. For 1 and 2, 2D supramolecular layers were formed by hydrogen bonds which were extend into 3D supramolecular structures via π···π interactions between two symmetry–related imidazole rings of neighboring molecules. Furthermore, optical and thermal properties of the complexes were also studied.

Keywords

• 5-nitroisophthalate,coordination polymer,optical properties

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