Two triphenylamine-based luminescent metal–organic frameworks as a dual-functional sensor for the detection of nitroaromatic compounds and ofloxacin antibiotic

Abstract

Two solvent-induced luminescent MOFs have been synthesized and MOF1 can be employed as a dual-functional fluorescence sensor for nitroaromatics and antibiotics.

Assembly of Two Self-Interpenetrating Metal–Organic Frameworks Based on a Trigonal Ligand: Syntheses, Crystal Structures, and Properties

“…Figure b shows the linear relationship of the values of I 0 / I – 1 and the NFT concentrations in the full detection concentration range. The calculated K sv value of NFT is as high as 4.64 × 10 4 M –1 , and the corresponding R 2 value is obtained as 0.9981, which shows that MOF 1 is the most sensitive sensor material. − The selectivity of MOF 1 is a very significant factor for sensors in real applications, which can be studied and proven by the selective trials. It is found that all emission spectra almost disappeared only after adding NFT in the detected system (Figure c), proving that MOF 1 has excellent selectivity toward NFT even in other disturbed antibiotics.…”

“…It clearly found that the luminescence behavior of MOF 1 is similar to that of this linker, but a slight blue-shift phenomenon was mainly attributed to the metal-coordination interaction to enhance the ligand rigidity and decrease the energy loss by radiationless decay. − Antibiotics are easily dissolved in water, so water was selected as the detectable system. From the previous reports, some MOFs have been implemented as luminescent sensors to monitor antibiotics. − In addition, MOF 1 can preserve the luminescent behavior in water after 1 day (Figure b). This encouraged us to explore the detectability of MOF 1 to antibiotics in aqueous solutions.…”

Design and Construction of a Metal–Organic Framework as an Efficient Luminescent Sensor for Detecting Antibiotics

“…Investigation and exploration of the luminescence quenching mechanism are significantly important work to gain deep insight into the relationship of the structure and detectability. Taking into account the previous reports, most of the possible quenching mechanisms are summarized and divided into four categories: guest adsorption, host–guest interaction, skeleton damage, and light energy competition. − First, the maximum emission peak of MOF 1 in NFT or NFZ (0.06 mM) was collected at different immersion times to investigate the signal response rates in Figure a. The luminescence intensity of ground 1 will sharply decrease to a minimum value after 75 s and retain this status for a long time.…”

Lanthanide ternary mixed-ligand coordination polymers as fluorescent sensors for the sensitive and selective detection of chlorogenic acid

“…When the LUMO level of the detected substance is lower, electrons are easily transferred to the detected substance, which results in the interference of energy transfer between the ligand and metal ions, leading to fluorescence quenching. 34,35 As shown in Fig. 10b, according to the DFT calculation, the LUMO levels of H 2 ox (−1.97 eV) and H 2 bct (−1.05 eV) was higher than that of chlorogenic acid (−2.13 eV).…”