Self-Assembled Cd-MOF Material Supported by a Triazine Skeleton: Stimuli Response to Traces of Nitroaromatics and Amines

As an important chemical raw material, nitro aromatic compounds (NACs) and primary aromatic amines are widely used in the chemical industry. However, they are serious pollutants, which have already threatened human beings and the environment. Therefore, it is critical to develop a simple strategy to detect them. Luminescent metal-organic framework (LMOF) sensors have been promising platforms for sensing NACs and aromatic amines because of stable pore structure, outstanding optical properties, fast response, excellent sensitivity, and low detection limit. In this work, a novel LMOF [Cd3(TDPAT) (H2O)6(mu-H2O)3]center dot 4H2O center dot 2DMF (Cd-MOF) was constructed by 5,5 ',5 ''-(1,3,5-triazine-2,4,6-triyltriimino) tris(azanediyl) trisoph-thalate (H6TDPAT) and Cd(NO3)2 center dot 4H2O. The structure was analyzed in detail and the results showed that Cd-MOF presented a unique hexagonal-petal shape composed of binuclear building blocks [Cd2O13] connected by a triazine hexacarboxylic skeleton, which also showed an interesting three-dimensional porous structure. Through fluorescence properties and sensing experiments, we found that it possessed strong fluorescence emission and exhibited an excellent sensitivity for the detection of NACs. It could correspond sensitively to 2,4,6-trinitrophenol (TNP), 2,4-dinitrophenol (DNP), p-dinitrobenzene (p-DNB), o-dinitrobenzene (o-DNB), p-nitrophenol phenol (PNP), and o-nitrophenol (ONP). Notably, it exhibited extremely low detection limits for TNP, DNP, and PNP at 0.089, 0.092, and 0.016 mu M, respectively. In addition, it could distinguish a class of isomers of primary aromatic amines (OPD, MPD, and PPD) through fluorescence properties experiment and detect OPD and MPD sensitively.