A Stable Dual-Emitting Dye@LMOF luminescence probe for Rapid and Visible Detection of organophosphorous pesticides in Aqueous Medium

A novel 3D supermolecule metal-organic framework (LMOF 1) {[Cd1.5(TCPB)(phen) 2DMF•3.5Dioxane•H2O]}n (H3TCPB = 1,3,5-tris(4-carbonylphenyloxy)benzene, phen = 1,10-Phenanthroline monohydrate), has been solvothermally synthesized. By the incorporation the fluorescent guest molecule rhodamine B (RhB) into the channel of LMOF 1, the composite RhB@LMOF 1 was successfully prepared. Because the channel of LMOF 1 can restrain the dissociation of RhB aggregation, the RhB@LMOF 1 displays outstanding stability after treating with varying conditions. The solid state fluorescence spectrum analysis shows that RhB@LMOF 1 appears the characteristic emissions of both RhB and LMOF 1. Subsequently, the luminescent sensing of RhB@LMOF 1 for six kinds of pesticides was carried out at room temperature. The result demonstrates that RhB@LMOF 1 can sensitively and selectively recognize organophosphorous (OPs) pesticides, which is mainly attributed to the synthetic effect of the internal filter effect (IFE) and photo-induced electron transfer (PET).