The nitro aromatic compounds detection by triazole carboxylic acid and its complex with the fluorescent property

The 5-methyl-1-(4-nitropheny1)-111-1, 2, 3-triazole-4-carboxylic acid (1) was synthesized by an improved method. By using the compound 1 as ligand, a new complex [Cu(L)(2)][Cu(L)(2)(H2O)(2)] (2) was prepared firstly under hydrothermal condition. Both 1 and 2 were all used as exclusive fluorescence sensor for 2, 4, 6-trinitrophenol (TNP) for the first time. The fluorescence exploration demonstrated that they exhibit highly selective and sensitive (K-SV = 393685 M-1 and K-SV = 213269 M-1, respectively) sensing to TNP from other nitro aromatic compounds (NACs) with high quenching efficiency QP value of 96.76% and 93.37%, as well as low detection limit (0.68 mu M and 0.37 mu M, respectively). It means that complex 2 had higher selectivity due to the less interference by 4-NT and 2-NP compared with 1. Moreover, the fluorescence quenching phenomenon of sensor 1 with MP was analyzed by density functional theory (DFT). (C) 2017 Elsevier Ltd. All rights reserved.