A highly efficient lanthanide coordination polymer luminescent material for the multi-task detection of environmental pollutants

It is challenging to explore novel-structure lanthanide coordination polymers (Ln-CPs) for sensing environmental pollutants. Herein, we designed and synthesized an organic bridging linker 3-(carboxymethoxy)-1-(carboxymethyl) pyrazole-4-carboxylic acid (H 3 ccpc), and then successfully prepared and characterized a novel Ln-CP, namely [Tb 2 (ccpc) 2 (H 2 O) 6 ]·1.5H 2 O ( ccpcTb ). Structural analysis indicates that ccpcTb exhibits a two-dimensional structure, in which Tb ions are in an eight-coordinated environment. The photoluminescence performance of ccpcTb was discussed in detail. The ccpcTb displays bright green luminescence and behaves as a multi-responsive luminescent sensor toward Fe 3+ ions, Cr 2 O 7 2− ions and 2,4,6-trinitrophenol with high selectivity and low detection limits. Furthermore, the possible luminescence sensing mechanisms have been addressed in detail. The luminescence quenching mechanism of sensing Fe 3+ and Cr 2 O 7 2− is attributed to the energy competitive absorption, while that of sensing TNP is due to the synergistic effect of energy competitive absorption and photo-induced electron transfer. A novel terbium coordination polymer based on pyrazole carboxylic acid was designed and synthesized. Its applications as a luminescent chemosensor toward Fe 3+ , Cr 2 O 7 2− and 2,4,6-trinitrophenol have been explored in detail.