Four metal(II) ions induced complexes based on semi-rigid imidazolium carboxylate ligand: Syntheses, structures and properties.

Although the four complexes were constructed by the same 4-(1 H -2-methyli midazol-1-yl)benzoic acid ligand, their structures are quite different. They exhibit fascinating 0D, 1D, 2D+2D→ 3D, and 3D → 3D structures, respectively. • Four new metal(II) ions complexes were synthesized. • X-ray crystal structure determination. • The fluorescent properties and molecular simulation of the complex 4 was investigated. By modulating the synthetic strategy based on changing metal salt used in the synthesis, four new metal(II) complexes, [Cu(MIBA) 2 (H 2 O) 3 ]·2H 2 O (C 22 H 28 CuN 4 O 9) (1), [Ni 2 (MIBA) 4 (H 2 O) 6 ] n (C 44 H 48 Ni 2 N 8 O 14) (2), [Co(MIBA) 2 ] n (C 22 H 18 CoN 4 O 4) (3) and [Zn(MIBA) 2 ] n (C 22 H 18 ZnN 4 O 4) (4) constructed by 4-(1H-2-methylimidazol-1-yl)benzoic acid (HMIBA) were synthesized under hydrothermal/solvothermal conditions and characterized by single crystal X-ray diffraction, powder XRD, FT-IR, TGA and elemental analysis techniques. Although the four complexes were constructed by the same semi-rigid imidazolium carboxylate ligand, their structures are quite different. The structural analyses revealed that complex 1 is a discrete mononuclear unit, which are extended to form 3 D supramolecular architectures by hydrogen bonds. Complex 2 features a 1D antenna-like chain, complex 3 exhibit a 2D + 2D → 3D structure, and complex 4 exhibits a 3D → 3D fourfold interpenetrating framework. Furthermore, the fluorescent properties and molecular simulation of the complex 4 was also investigated in the solid state at room temperature. [ABSTRACT FROM AUTHOR]