Spectroscopic properties of Eu(III) complexes with 2,6-lutidine N-oxide and its bromo-methoxy derivative; of Eu(LNO)6, Eu(LNO)5L, EuCl3(BrMLNO)3 and Eu(LNO)8 type

Luminescence, luminescence excitation and electronic absorption spectra of europium salts of isomeric lutidine N-oxide derivatives were studied at 293 and 77 K. The role of radiative and non-radiative processes in emission intensity is discussed. The absorption transitions to the ³F_J, ⁵D_J, ⁵L_J and ⁵G_J levels and emissions from the ⁵D₀ and ⁵D₂ levels were detected. The role of CT transition inside the ligand and its influence on the LMCT transition is analysed. The co-ordinating function of the lutidine N-oxide group is discussed using IR spectroscopy.