A novel strategy of constructing 2D supramolecular organic framework sensor for the identification of toxic metal ions

摘要

Two novel two-dimensional(2D)supramolecular organic frameworks were fabricated in water based on the encapsulation-enhanced donor-acceptor interaction between the methyl viologen(MV)units,methoxy naphthyl(MN)units,and CB[8].The tetraphenylethylene(TPE)derivatives 1 with four MV units were employed as rigid building blocks and the two MN units modified oligoethylene glycol derivatives 2 and 3 served as flexible edges,respectively.The obtained two SOFs have obvious sheet-like structures and exhibit fluorescence emission at 350-500 nm.In addition,these two SOFs were employed for the luminescent detection of Cr(VI)and Mn(VII)in aqueous solutions,and the detection limits of CrO_(4)^(2-),Cr_(2)_(O)7%^(2-),and MnO_(4)were calculated in a very low concentration range,indicating that these two SOFs can serve as a potential sensor for Cr(VI)and Mn(VII)detection in water.This work constructs two SOFs in an aqueous solution through a facile method and further enriches the applications of SOFs.