Synthesis, crystal structures and optical properties of two coordination polymers from 4-(1H-tetrazol-5-yl) benzoic acid

The coordination polymers [Mn(4-TZBA2−)(H2O)2] (1) and [Mn4(4-TZBA2−)4(μ2-H2O)2(H2O)(py)] (2) (py = pyridine) were prepared by the treatment of Mn(ClO4)2 · 6H2O with 4-(1H-tetrazol-5-yl) benzoic acid (H2(4-TZBA)) under hydrothermal conditions. Compound 2 has nanosize triangular channels with a dimension of 11.924 × 11.686 × 14.835 Å, in which guest water molecules are encapsulated. Compound 1 and 2 show strong fluorescence at room temperature in the solid state and compound 2 exhibits a second-order coefficient about 0.3 time that of KDP.

Graphical abstractTwo new 3D coordination frameworks from 4-(1H-tetrazol-5-yl) benzoic acid were prepared. Two types of coordination modes of 4-TZBA2− ligand are found in these two compounds. The non-linear optical (NLO) activity of compound 2 shows that different assembly can lead to different function although the assembly has the same metal and ligand. The luminescent properties show that the emissions of 1 and 2 can be assigned to the ligand-to-metal charge transfer (LMCT), indicating that the emission wavelength and the intensity of the organic materials can be affected by metal coordination. All the results indicated that the functional materials can be obtained by adjusting the assembly on the basis of structure of the ligand.Figure optionsDownload full-size imageDownload as PowerPoint slide