title: Synthesis and time-gated fluorometric application of a europium(III) complex with a borono-substituted terpyridine polyacid ligand.
abstract: A new europium(III) complex with a borono-substituted terpyridine polyacid ligand, (4'-borono-2,2':6',2″-terpyridine-6,6″-diyl) bis(methylenenitrilo) tetrakis(acetate)-Eu(3+) (BTTA-Eu(3+)), has been designed and synthesized as a luminescence probe for hydrogen peroxide (H(2)O(2)). The complex is highly luminescent in aqueous buffers to display a typical Eu(3+) emission pattern with a sharp emission peak at 610 nm and a long luminescence lifetime of 1.34 ms. Upon reaction with H(2)O(2), the deboronation derivative of BTTA-Eu(3+), (4'-hydroxy-2,2':6',2″-terpyridine-6,6″-diyl) bis(methylenenitrilo) tetrakis(acetate)-Eu(3+) (HTTA-Eu(3+)), can be generated. It was found that the luminescence of BTTA-Eu(3+) was pH-insensitive, whereas that of HTTA-Eu(3+) was pH-dependent and could be remarkably weakened in neutral and basic buffers, which allowed BTTA-Eu(3+) to be a luminescence probe for the time-gated luminescence detection of H(2)O(2) in neutral and basic buffers. The H(2)O(2)-BTTA-Eu(3+) system was applied to monitor the kinetics of the palladium-catalyzed Suzuki cross-coupling reaction between BTTA-Eu(3+) and bromobenzene, which suggested a useful strategy for the application of time-gated luminescence technique in catalysis reaction researches.
authors.affiliation: State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Mingjing
authors.initials: M
authors.lastname: Liu
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Ye
authors.forename: Guilan
authors.initials: G
authors.lastname: Wang
authors.forename: Jingli
authors.initials: J
authors.lastname: Yuan
mesh_terms: D001896:Boron Compounds; D005063:Europium / Q000737:chemistry*; D005470:Fluorometry / Q000379:methods*; D006861:Hydrogen Peroxide / Q000032:analysis; D007700:Kinetics; D008024:Ligands; D008163:Luminescent Measurements; D011725:Pyridines / Q000737:chemistry*
chemical_list: D001896:Boron Compounds; D008024:Ligands; D011725:Pyridines; D005063:Europium; D006861:Hydrogen Peroxide