Odd-even effect on luminescence properties of europium aliphatic dicarboxylate complexes
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The odd–even effect in luminescent [Eu2(L)3(H2O)x]·y(H2O) complexes
with aliphatic dicarboxylate ligands (L: OXA, MAL, SUC,
GLU, ADP, PIM, SUB, AZL, SEB, UND, and DOD, where x=2–6
and y=0–4), prepared by the precipitation method, was
observed for the first time in lanthanide compounds. The final
dehydration temperatures of the Eu3+ complexes show a zigzag
pattern as a function of the carbon chain length of the
dicarboxylate ligands, leading to the so-called odd-even effect.
The FTIR data confirm the ligand–metal coordination via the
mixed mode of bridge–chelate coordination, except for the
Eu3+-oxalate complex. XRD results indicate that the highly
crystalline materials belong to the monoclinic system. The odd–
even effect on the 4 f–4 f luminescence intensity parameters (Ω2
and Ω4) is explained by using an extension of the dynamic
coupling mechanism, herein named the ghost-atom model. In
this method, the long-range polarizabilities (a*) were simulated
by a ghost atom located at the middle of each ligand chain. The
values of a* were estimated using the localized molecular
orbital approach. The emission intrinsic quantum yield (QLn
Ln) of
the Eu3+ complexes also presented an the odd-even effect,
successfully explained in terms of the zigzag behavior shown by
the Ω2 and Ω4 intensity parameters. Luminescence quenching
due to water molecules in the first coordination sphere is also
discussed and rationalized.
Como referenciar
ASSUNÇÃO, ISRAEL P.; CARNEIRO NETO, ALBANO N.; MOURA JUNIOR, RENALDO T.; PEDROSO, CASSIO C.S.; SILVA, IVAN G.N.; FELINTO, MARIA C.F.C.; TEOTONIO, ERCULES E.S.; MALTA, OSCAR L.; BRITO, HERMI F. Odd-even effect on luminescence properties of europium aliphatic dicarboxylate complexes. ChemPhysChem, v. 20, n. 15, p. 1931-1940, 2019. DOI: 10.1002/cphc.201900603. Disponível em: http://repositorio.ipen.br/handle/123456789/30460. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.