Study on Fluorescence Recognition of Fe(3+), Cr(2)O(7)(2−) and p-Nitrophenol by a Cadmium Complex and Related Mechanism

The effective detection of environmental pollutants is very important to the sustainable development of human health and the environment. A luminescent Cd(II) coordination complex, {[Cd(dbtdb)(1,2,4-H(3)btc)]·0.5H(2)O}(n) (1) (dbtdb = 1-(2,3,5,6-tetramethyl-4-((2-(thiazol-4-yl)-2H-benzo[d]imidazol-3(3aH)-yl)methyl)benzyl)-2,7a-dihydro-2-(thiazol-4-yl)-1H-benzo[d]imidazole, 1,2,4-H(3)btc = 1,2,4-benzenetricarboxylic acid), was obtained by hydrothermal reactions. Complex 1 has a chain structure decorated with uncoordinated Lewis basic O and S donors and provides good sensing of Fe(3+), Cr(2)O(7)(2−), and p-nitrophenol with fluorescence quenching through an energy transfer process. The calculated binding constants were 3.3 × 10(3) mol(−1) for Fe(3+), 2.36 × 10(4) mol(−1) for Cr(2)O(7)(2−), and 9.3 × 10(3) mol(−1) for p-nitrophenol, respectively. These results show that 1 is a rare multiresponsive sensory material for efficient detection of Fe(3+), Cr(2)O(7)(2−), and p-nitrophenol.