Spectra and details of the structure of europium aliphatic carboxylates with 1,10-phenanthroline derivatives

Spectroscopy of europium and terbium pyridine-carboxylates

“…The frequency of the symmetric stretching vibration of the carboxylate groups, s (COO − ) in the vibration spectra of isonicotinates is equal to ∼1435 cm −1 , the frequency of the antisymmetric stretching vibration, as (COO − ) is equal to ∼1550 cm −1 . The difference between as (COO − ) and s (COO − ) (∼115 cm −1 ) is not as large as it should be in cases of stronger polarised mono-or tridentate carboxylate groups [24]. So, the co-ordination function of the carboxylate groups in terbium and europium isonicotinates seems to be bidentate cyclic or bidentate bridging (weakly polarised COO − groups).…”

Europium and terbium thiocyanates: Syntheses, crystal structures, luminescence and magnetic properties

“…The much less intense magnetic dipole transition 5 D 0 ? 7 F 1 shows the maximum number of Stark components (588, 592, and 595 nm), indicating a low symmetry of charge distribution in the nearest environment of the Eu 3+ ion [26].…”

Luminescence properties of isomeric and tautomeric lanthanide pyridinedicarboxylates

“…In cases of the 2,3-PDA salts, one of the oxygen atoms of ortho-carboxylate takes part in forming the five-member chelate cycle with europium cation. The meta-carboxylate cannot coordinate the same europium ion but may coordinate other ions so compounds having dimeric structures sim- ilar to [17,18] with equivalent lanthanide ions could be obtained. This coordination function is confirmed by data of IR spectroscopy [15] since ring "breathing" vibration as well as symmetric and asymmetric stretching carboxylate vibrations are split.…”