The luminescent properties of a terbium complex with a hexadentate ligand of N,N'-Bis(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid (HBED) having a phenolate functional group as antenna moiety, have been investigated. The complex exhibits a high emission quantum yield (φ = 0.222, ex. 288 nm, em. 546 nm) with a long decay lifetime (τ(H2O) = 1.2 ms) in aqueous solution, which indicates energy-transfer type emission. The number of metal-bound water molecules in the complex was determined to be q = 1.8. The triplet energy level was estimated based on the data of its low-temperature phosphorescence. The calibration graph for Tb(III) was linear over the range from 3 x 10-11 to 1 x 10-8 mol dm-3. A 3 σ-blank detection limit of 3 ppt was achieved.
ASJC Scopus subject areas