科研之友
微信
新浪微博
Facebook
分享链接
摘要
2,6-Pyridine dicarboxylic acid (DPA) is considered one of the main anthrax biomarkers, and the detection of DPA is of great significance. This work presents a Zn(II)-based metal-organic framework (MOF) with the formula {[Zn-2(2,6-NBC)(2)(vlpy)Zn(2,6-NBC)(vlpy)(0.5)]center dot 0.8(2,6-H2NBC)center dot H2O} n (1) assembled from 2,6naphthalenedicarboxylic acid (2,6-H2NBC) and 4,4'-vinylenedipyridine (vlpy) for a photoluminescence sensor matrix for DPA detection. 1 features a 3D pillar-layer framework with nanopore sizes of ca.13.165 A x 12.731 A, 12.725 A x 11.018 A and 13.114 A x 13.165 A along the three directions, occupied by lattice water and disordered 2,6-H2NBC molecules. The obtained 1 can be used as a turn-on fluorescence sensor for the detection of DPA with high selectivity, excellent sensitivity and recyclability. The luminescence of 1 demonstrates an obvious color change from blue to purplish blue as the DPA concentration rises. Furthermore, a linear correlation is presented between the fluorescence and a low DPA concentration of 0-0.3 mM, and the detection limit can reach as low as 128 nM, much lower than that of an infectious dose to a human of anthrax spores (60 mu M). A fluorescence test paper is fabricated to detect DPA rapidly through color change. DFT calculations indicate the intermolecular photoinduced electrontransfer transition and hydrogen-bonding interaction between DPA molecules and the skeleton of 1 induces the "turn-on" fluorescence sensing of DPA behavior.
-
单位南昌航空大学
