Effective nitenpyram detection in a dual-walled nitrogen-rich In(iii)/Tb(iii)–organic framework

Abstract

By employing a mixed metal synthesis strategy, a heterometallic MOF, [In₃Tb₃O₃(TATAB)₄(H₂O)₆]·12DMF·12H₂O (1), has been constructed based on a nitrogen-rich ligand 4,4′,4′′-s-triazine-1,3,5-triyltri-p-aminobenzoic (H₃TATAB). Compound 1 shows a 3D doubly interpenetrated framework built from dual-walled cages of dimension ca. 2.8 nm. In particular, the framework of 1 possesses a high density of Lewis acidic metal ions and Lewis basic –NH– sites decorated on the pore walls. Fluorescent sensor study indicates that 1 can maintain its stability and agility after several cycles of detecting nitenpyram, and the detection limit of 1 for nitenpyram is as low as 0.17 μg mL⁻¹.