The influence of the odd-even effect of aliphatic dicarboxylate ligands on the photoluminescent properties of europium complexes
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2020
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PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS
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Eleven [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)
were synthesized and characterized by elemental and thermal analysis, FTIR
spectroscopy and powder X-ray diffraction. The obtained data confirms the ligand to
metal ratio, the hydration degree, the coordination mode and that the complexes are
crystalline. The oddeven effect was observed for the final dehydration temperature of the
Eu3+ complexes (Fig. 1). Moreover, the effect was also observed in the experimental and
theoretical photoluminescent properties such as the intensity parameters, Ω2 and Ω4 (Fig.
2) and the emission intrinsic quantum yield, QLnLn (Fig. 3) of the Eu3+ complexes. The odd-even
effect on the Ω2 and Ω4 values could be explained by using an extension of the
dynamic coupling mechanism, herein named the ghost-atom (GA) model, in which the
long-range polarizabilities (α*) were determined by simulating the presence of a ghost
atom in the middle of each ligand carbon chain and the localized molecular orbital
approach. The GA approach is an extension of the Bond Overlap Model (BOM) [1].
Como referenciar
ASSUNCAO, ISRAEL; NETO, ALBANO; MOURA JUNIOR, RENALDO; PEDROSO, CASSIO; SILVA, IVAN; FELINTO, MARIA C.; TEOTONIO, ERCULES; MALTA, OSCAR; BRITO, HERMI. The influence of the odd-even effect of aliphatic dicarboxylate ligands on the photoluminescent properties of europium complexes. In: PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS, October 13-15, 2020, Online. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/32677. Acesso em: 26 Apr 2024.
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