Copper triazine polycarboxylic acid crystalline framework materials: Synthesis, structure and multifunctional properties with the luminescent and catalytic reduction of 4-NP

Abstract

Metal-organic frameworks are a class of promising materials that are widely used in various fields such as detection, catalysis, and adsorption. A new protonated coordination polymer [Cu2(H2TTHA)(H2O)6] (1) containing two uncoordinated carboxylate acid groups was synthesized under the condition of hydrothermal, and a series of characterizations including elemental analysis, infrared spectroscopy, PXRD, thermogravimetric analysis, and ultraviolet–visible spectroscopy were performed. It has a 3D supramolecular network structure. In order to further study the reproducible synthesis conditions, we unexpectedly got a partly protonated coordination polymer material [Cu3(H3TTHA)(μ3-O)(μ3-OH)(μ2-H2O)2(H2O)]·2H2O (2), which was different from the structure of 1 and contained three uncoordinated carboxylate acid groups in the framework structure. It was found that coordination polymer 1 has good catalytic activity for the catalytic reduction of 4-NP under mild reaction conditions. In the meantime, it can be used as a sensor to detect a small amount of Fe3+ (1 mM), and the detection limit for Fe3+ is 21 μM. The results show that 1 possesses a good application prospect in terms of fluorescence sensing and catalysis.