Highly Selective Aqueous Phase Detection of Azinphos-Methyl Pesticide in ppb Level Using a Cage-Connected 3D MOF

摘要

abstract_textpA new metal-organic framework (MOF) Cd2.5(PDA)(tz) 3 {PDA= 1,4-Phenylenediacetate and tz= 1,2,4-triazolate}, 1, has been synthesized by solvothermal reaction. The structure and morphology of 1 was systematically characterized by Powder X-ray diffraction (PXRD), Single crystal X-ray diffraction (SCXRD), Thermogravimetric analysis (TGA), Infrared spectroscopy (IR) and Field emission scanning electron microscopy (FESEM). Single crystal X-ray data of 1 confirmed cage connected threedimensional structure with three different types of Cd2+ ions (square pyramidal, trigonal antiprism and octahedral geometries). Photoluminescence study of 1 in aqueous medium showed emission at 290 nm upon excitation at 225 nm. This emissive property was used for the highly selective and sensitive detection of azinphos-methyl pesticide in aqueous medium through luminescence quenching. Compound 1 is able to detect azinphos-methyl with a detection limit of 16 ppb and its sensitivity remains unchanged in the presence of other pesticides./p/abstract_text