A 5,6,11,12,17,18-Hexaazatrinaphthylene-Based Luminescent Metal-Organic Framework as Ornidazole Sensor with Extremely High Sensitivity

The misuse of ornidazole (ODZ) has caused serious harm to human-beings and environment. Hence, it is very important to develop efficient materials for sensing ODZ. In this article, a unique luminescent metal-organic framework (LMOF) [Cd(HATNA)1/2(2,6-NDC)1/2NO3·2H2O]n (1) was synthesized by cadmium nitrate, 2,6-naphthalenedicarboxylic acid (2,6-H2NDC) and 5,6,11,12,17,18-hexaazatrinaphthylene (HATNA) with a large π-conjugation skeleton. 1 displays a three-dimensional (3-D) framework, fabricated by 4-connected [Cd2(COO)2(NO3)2] cluster, single-bridged 2,6-NDC2− and double-chelated HATNA. It possesses excellent thermal and pH stabilities as well as luminescent properties. Significantly, 1 can efficiently detect ODZ in aqueous medium by luminescence quench effect. Notably, the quenching constant and detection limit of 1 towards ODZ reach 1.52×105 M−1 and 7.70 × 10−5 mM, respectively, which are the best values among those of LMOF-based ODZ sensors. Furthermore, the sensing mechanism of 1 towards ODZ has been investigated.