Enhanced Circularly Polarized Green Luminescence Metrics from New Enantiopure Binary -Pyrazolonate-Tb Complexes.

Achieving superior circularly polarized luminescence brightness () is an important subject and continuous challenge for chiroptical materials. Herein, by applying a binary molecular design for the synthesis of chiral organo-Tb molecules, a novel pair of mononuclear chiral -pyrazolate-Tb enantiomers, [Tb(PMIP)(,-Ph-PyBox)] () and [Tb(PMIP)(,-Ph-PyBox)] (), have been synthesized and characterized. The three 1-phenyl-3-methyl-4-(isobutyryl)-5-pyrazolone () ligands play the role of efficient luminescence sensitizers and strong light-harvesting antennas, while the enantiopure 2,6-bis(4-phenyl-2-oxazolin-2-yl) pyridine ligand (/) is employed as the strong point-chiral inducer. With the proper combination of the and within the Tb enantiomers, strong ()-centered π-π electronic absorption ( = 38,400-39,500 M cm) and brilliant high-purity ligand-sensitized Tb-centered green luminescence ( = 47-48%) were observed. In addition, a clear circularly polarized luminescence (CPL) activity (|| = 0.096-0.103) was also observed, resulting in a strong (610-623 M cm) for the two Tb enantiomers from the hypersensitive transitions. Our results offer an effective path to develop high-performance chiroptical organo-Tb luminophores.