Synthesis, characterization and luminescence properties of N, N′-bis(2-pyridinecarboxamide-1- N-oxide)-1,2-ethane and corresponding lanthanide(III) complexes

• Published in: Journal of luminescence 2007-12, Vol.127 (2), p.316-320
• Main Authors: Zhang, Hai-Jun, Li, Gang, Yan, Lan, Yang, Ru-Dong
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Exact sciences and technology; Fluorescence and phosphorescence spectra; Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion); Infrared spectra; Lanthanide compounds; Luminescence property; Molecular properties and interactions with photons; Molecular spectra; N, N′-bis(2-pyridinecarboxamide-1- N-oxide)-1,2-ethane metal complexes; Phosphorescence; Physics; Pyridine- N-oxide group; Triplet energy level
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2007.01.015

Several lanthanide (Ln) complexes (Ln=Eu(III), Gd(III), Tb(III)) with a new ligand N, N′-bis(2-pyridinecarboxamide-1- N-oxide)-1,2-ethane (LH 2), containing two pyridine N-oxide chromophores and a flexibly connected N, N′-dicarboxamide-1,2-ethane, have been prepared and characterized by elemental analysis, conductivity measurements, IR spectra and thermal studies. The luminescence properties of the series of lanthanide complexes in solid state were investigated. Also, we compared the relative fluorescent intensities of these complexes with corresponding complexes with nonoxide derivative N, N′-bis(2-pyridinecarboxamide)-1,2-ethane (L′H 2). The results have shown that pyridine- N-oxide group is an excellent sensitizer to lanthanide luminescence over pyridine group.