Luminescence recognition behavior concerning different anions by lanthanide complex equipped with electron-withdraw groups and in PMMA matrix

Abstract

Lanthanide tris(2-thenoyltrifluoroacetonate) complex based on 2-(3,5-difluorophenyl)imidazo [4,5-f]-1,10-phenanthroline (1) with red luminescence acted as effective receptors for F- and AcO- anions. Spectroscopic studies of UV-vis, fluorescence and NMR present that the sensor exhibits striking emission changes to fluoride (green) and acetate anions (yellow-red to green) respectively due to hydrogen binding interactions. More importantly, transparent hybrid thick films composed by europium complex and poly-methyl methacrylate (PMMA) matrix were successfully prepared. All the films exhibit intense red emissions of europium ions and the optimized composing concentration of luminescent species is 0.5 mg/5 ml MMA. The derived film could give rise to luminescence change in fluoride anion containing DMSO solution. The micro-structure and size of the hybrid films were characterized by dynamic light scattering (DLS), the results reflect that granule size has the average diameter of 300 nm. © 2010 Elsevier B.V.