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Odd-Even Effect on Luminescence Properties of Europium Aliphatic Dicarboxylate Complexes.
Assunção, Israel P; Carneiro Neto, Albano N; Moura, Renaldo T; Pedroso, Cássio C S; Silva, Ivan G N; Felinto, Maria C F C; Teotonio, Ercules E S; Malta, Oscar L; Brito, Hermi F.
Afiliação
  • Assunção IP; Department of Fundamental Chemistry Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, São Paulo-SP, 05508-000, Brazil.
  • Carneiro Neto AN; Department of Fundamental Chemistry, Federal University of Pernambuco, Av. Prof. Moraes Rego, Recife-PE, 50670-901, Brazil.
  • Moura RT; Physics Department and CICECO-Aveiro Institute of Materials, University of Aveiro Campus Universitário de Santiago, Aveiro, 3810-193, Portugal.
  • Pedroso CCS; Department of Chemistry and Physics, Federal University of Paraíba, Campus II Cidade Universitária, Areia-PB, 58397-000, Brazil.
  • Silva IGN; Department of Fundamental Chemistry Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, São Paulo-SP, 05508-000, Brazil.
  • Felinto MCFC; Department of Fundamental Chemistry Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, São Paulo-SP, 05508-000, Brazil.
  • Teotonio EES; Nuclear and Energy Research Institute-IPEN/CNEN, Av. Prof. Lineu Prestes, São Paulo-SP, 05508-000, Brazil.
  • Malta OL; Department of Chemistry, Federal University of Paraíba Jardim Universitário,-João Pessoa-PB, 58051-970, Brazil.
  • Brito HF; Department of Fundamental Chemistry, Federal University of Pernambuco, Av. Prof. Moraes Rego, Recife-PE, 50670-901, Brazil.
Chemphyschem ; 20(15): 1931-1940, 2019 08 05.
Article em En | MEDLINE | ID: mdl-31231943
The odd-even effect in luminescent [Eu2 (L)3 (H2 O)x ]⋅y(H2 O) 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 ( α* ) were simulated by a ghost atom located at the middle of each ligand chain. The values of α* were estimated using the localized molecular orbital approach. The emission intrinsic quantum yield ( QLnLn ) 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.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Chemphyschem Assunto da revista: BIOFISICA / QUIMICA Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha
Texto completo
Adicionar na Minha BVS
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XML
PubMed Links
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Chemphyschem Assunto da revista: BIOFISICA / QUIMICA Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha