A lanthanide–organic crystalline framework material encapsulating 1,3,6,8-tetrakis(p-benzoic acid)pyrene: selective sensing of Fe3+, Cr2O72− and colchicine and white-light emission

Abstract

A facile strategy was used to construct a series of composite materials with color-tunable and white light emission by encapsulating 1,3,6,8-tetrakis(p-benzoic acid)pyrene (H₄TBAPy) into framework material [Eu(MCTCA)_1.5(H₂O)₂]·1.75H₂O (Eu-MCTCA), which is synthesized based on Eu(NO₃)₃·6H₂O and 5-methyl-1-(4-carboxylphenyl)-1H-1,2,3-triazole-4-carboxylic acid (H₂MCTCA). A slight adjustment of the emission color can be easily fulfilled by simply altering the concentration of H₄TBAPy or regulating the excitation wavelength. Notably, white light emitting Eu-MCTCA@H₄TBAPy can be realized by encapsulating H₄TBAPy with a concentration of 0.75 mM, when the excitation wavelength is 350 nm. Furthermore, based on the favorable luminescence and stable structure of Eu-MCTCA@H₄TBAPy in water or organic solvents, Eu-MCTCA@H₄TBAPy can be used as a potential luminescent probe for detecting Fe³⁺, Cr₂O₇²⁻ and colchicine.