Synthesis and luminescent properties of lanthanide complexes with structurally related novel multipodal ligands.
To explore the relationship between the structure of the ligands and the luminescent properties of the lanthanide complexes, a series of lanthanide nitrate complexes with two novel structurally related multipodal ligands, 1,3-bis{[(2'-(2-picolylaminoformyl))phenoxyl]methyl}benzene (L(I)) and 1,2-bis{[(2'-(2-picolylaminoformyl))phenoxyl]methyl}benzene (L(II)), have been synthesized and characterized by elemental analysis, infrared spectra and molar conductivity measurements. At the same time, the luminescent properties of the Eu(III) and Tb(III) nitrate complexes in solid state and the Tb(III) nitrate complexes in solvents were investigated at room temperature. Under the excitation of UV light, these complexes exhibited characteristic emissions of central metal ions. The lowest triplet state energy levels T(1) of these ligands both match better to the lowest resonance energy level of Tb(III) than to Eu(III) ion. The influence of the structure of the ligands on the luminescent intensity of the complexes was also discussed.
Wang
Qing
Q
Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People's Republic of China.
Yan
Xu-Huan
XH
Liu
Wei-Sheng
WS
Tan
Min-Yu
MY
Tang
Yu
Y