A luminescent europium MOF containing Lewis basic pyridyl site for highly selective sensing of o-, m- and p-nitrophenol

摘要

A new luminescent two-dimensional europium metal-organic framework [Eu-6(L)(3)(HL)(2)(H2O)(10)]center dot 10H(2)O center dot x(solvent) (1) has been successfully prepared by the solvothermal reaction of Eu(NO3)(3)center dot 6H(2)O and the multidentate pi-conjugated ligand H4L (H4L = (5,5'-(pyridine-2,5-diyl)-isophthalic acid)) which has a Lewis basic pyridyl site. The solid sample of 1 emits high bright red light which can be readily observed by the naked eyes when excited at 358 nm at ambient temperature. Interestingly, the luminescence of fine grinding 1 particles dispersed in ethanol can be sensitively and selectively quenched by adding trace amounts of o-, m- and p-nitrophenol (NP), which reveals that 1 can be used as a luminescence sensor for the detection of o-, m- and p-NP.