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.