Hydrogen bonded supra-molecular framework in inorganic–organic hybrid compounds of Mn(II) and Zn(II): Syntheses, structures, and photoluminescent studies

•Two compounds have been synthesized and characterized.•Weak interactions provide additional assembly forces. The fluorescence spectrum of the complexes are investigated.

In our efforts to tune the structures of compounds by selection of polycarboxylic acid ligands and N-heterocyclic ligands, two novel unreported compounds [Mn(cipt)(m-BDC)·H2O]n (1) and [Zn(mip)(NDC)]n (2) were obtained by hydrothermal reaction, where cipt = 2-(3-chlorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline, m-BDC = isophthalic acid, mip = 2-(3-methoxyphenyl)-1H-imidazo[4,5-f][1,10]phenanthroline, and NDC = naphthalene-1,4-dicarboxylic acid. All compounds have been characterized by IR, elemental analyses, single crystal X-ray diffraction, and thermogravimetric analysis (TGA). Structural analyses show that compounds 1 and 2 possess mononuclear structures and exhibit 1D zigzag chain structure. The intermolecular O–H⋯O and N–H⋯O interactions extend the compounds into 2D sheet networks. There are H-bonds and π–π interactions in the title compounds. Furthermore, the solid-state fluorescence spectrum of compounds 1 and 2 were also investigated.

Graphical abstractThe reaction of Mn(SO4)2·H2O, ZnCl2 with N-heterocyclic ligands and poly-carboxylate ligands yielded two novel coordination polymers. All compounds were characterized by elemental analysis, FT-IR, thermogravimetric analysis and X-ray crystallography. Furthermore, we studied the solid-state and solvent fluorescence spectrum, as well as the ligands.Figure optionsDownload full-size imageDownload as PowerPoint slide