Anion effects on the fluorescence spectra of europium and terbium complexes with a family of ether-amide type multipodal ligands.

Three multipodal ligands: 3,3,7,7-tetra[N-methyl-N-phenyl(acetamide)-2-oxymethyl]-5-oxanonane (L(a)), 3,3,7,7-tetra[N-ethyl-N-phenyl(acetamide)-2-oxymethyl]-5-oxanonane (L(b)), 3,3,7,7-tetra[N-benzyl-N-phenyl(acetamide)-2-oxymethyl]-5-oxanonane (L(c)) and their europium and terbium nitrate and perchlorate complexes were synthesized. The 12 complexes were characterized by elemental analysis, IR, fluorescence spectroscopy and conductivity. The lanthanide atoms are coordinated by O atoms from CO, C-O-C. With the difference of the anion, the fluorescence properties of anion effect for the complexes were investigated. Some factors that influencing the fluorescent intensity were discussed.