부산대학교 도서관

As one of the specific biomarkers of anthrax, timely, sensitive and accurate detection of 2,6-dipicolinicacid (DPA) plays an important role in preventing biological weapons attacks and disease outbreaks. Here, multiemission Eu3+/covalent- organic framework (COFDTA-TFP) and Tb3+/COFDTA-TFP were constructedby the coordination between Eu3+ or Tb3+ with fluorescent COFDTA-TFP which was prepared byamine-aldehyde dehydration condensation between 2,5-diaminoterephthalic acid and 2,4,6-triformylphloroglucinol for the first time. The Eu3+/COFDTA-TFP and Tb3+/COFDTA-TFP can emit nonoverlappingfluorescence of COFDTA-TFP and Eu3+ or Tb3+, which was used to ratiometric detection ofDPA. Due to the strong coordination between the nitrogen atoms in the pyridine ring and the oxygenatoms in the carboxyl group of DPA with Eu3+ or Tb3+, DPA replaced coordinated H2O to sensitize fluorescenceof Eu3+ or Tb3+ by ‘‘antenna” effect but fluorescence of COFDTA-TFP with two-dimensional lamellarstructure was kept constant as a reference. The linear range and detection limit of ratiometric fluorescencesensor based on Eu3+/COFDTA-TFP for detection of DPA are 0.01–12 mM and 4.2 nM, respectively. The linear range and detection limit of ratiometric fluorescence sensor based on Tb3+/COFDTA-TFP fordetection of DPA are 0.01–9.0 mM and 2.9 nM, respectively.