Crystal Structure and Fluorescence Property of Dimeric Complex [Mg(phen)(H2O)4·(2,7-nds)·(phen)·4H2O

Abstract

The dimeric complex [Mg(phen)(H2O)4·(2,7-nds)·(phen)·4H2O]2 (2,7-nds = 2,7-naphthalene-disulfonate anion, phen = 1,10-phenanthroline) has been synthesized by hydrothermal method. The single crystal was characterized by X-ray single crystal diffraction, elemental analysis, UV-Vis spectrum and thermo-gravimetric analysis methods. The magnesium ion coordinates to one 1,10-phenanthroline and four water molecules to form [Mg(phen)(H2O)4]2+cation. The [Mg(phen)(H2O)4]2+ cations, 2,7-nds anions, 1,10-phenanthroline molecules and free water molecules are interconnected to generate a honeycomb-like network architecture by O‒H⋅⋅⋅O, O‒H⋅⋅⋅N, and O‒H⋅⋅⋅S hydrogen bonds and the π-π packing interactions between the four 1,10-phenanthroline molecules. Compared with the ligands, the fluorescence spectrum of the complex happens red shift and the fluorescent property of the complex shows the emission maximum at 418 nm at room temperature (CCDC number: 948501).