Title
Homochiral luminescent lanthanide dinuclear complexes derived from a chiral carboxylate
Author
He-Rui Wen, Xin-Rong Xie, Sui-Jun Liu, Jun Bao, Feng-Feng Wang, Cai-Ming Liu, Jin-Sheng Liao
Year
2015
Journal
RSC Advances
Abstract
A new family of homochiral lanthanide dinuclear complexes based on a chiral carboxylate, namely [Ln(R-pba)3(phen)]2 (Ln = La (1), Ce (2), Pr (3), Nd (4), Sm (5), Eu (6), Gd (7), Tb (8), Dy (9) and Ho (10), R-pba = (R)-2-phenylbutyric acid, phen = 1,10-phenanthroline), have been synthesized and structurally characterized by single-crystal X-ray diffraction, elemental analyses and IR spectra. Complexes 1–10 are isostructural and crystallize in the chiral space group P21. Their optical activity and enantiomeric nature were confirmed by the circular dichroism spectra. Complexes 6, 8 and 9 exhibit strong fluorescent emissions with typical narrow emission bands of lanthanide ions and 6 and 8 display relatively high quantum yields. Magnetic investigations revealed that the weak antiferromagnetic exchange and/or the depopulation of the Ln(III) excited Stark sub-levels which exist in 7–10.
Instrument
J-1500
Keywords
Circular dichroism, Stereochemistry