Heterobinuclear Zn-Ln (Ln = La, Nd, Eu, Gd, Tb, Er and Yb) complexes based on asymmetric Schiff-base ligand: Synthesis, characterization and photophysical properties

Shunsheng Zhao*, Xiangrong Liu, Xingqiang Lü, Rick W K WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

With a novel asymmetric Schiff-base zinc complex ZnL (H2L = N-(3-methoxysalicylidene)-N′-(5-bromo-3-methoxysalicylidene)phenylene-1, 2-diamine), obtained from phenylene-1,2-diamine, 3-methoxysalicylaldehyde and 5-bromo-3-methoxysalicylaldehyde, as the precursor, a series of heterobinuclear Zn-Ln complexes [ZnLnL(NO3)3(CH3CN)] (Ln = La, 1; Ln = Nd, 2; Ln = Eu, 3; Ln = Gd, 4; Ln = Tb, 5; Ln = Er, 6; Ln = Yb, 7) were synthesized by the further reaction with Ln(NO3)3· 6H2O, and characterized by Fourier transform-infrared, fast atom bombardment mass spectroscopy and elemental analysis. Photophysical studies of these complexes show that the strong and characteristic near-infrared luminescence of Nd3+, Yb3+and Er3+ with emissive lifetimes in the microsecond range has been sensitized from the excited state of the asymmetric Schiff-base ligand due to effective intramolecular energy transfer; the other complexes do not show characteristic emission due to the energy gap between the chromophore and lanthanide ions.

Original languageEnglish
Pages (from-to)690-695
Number of pages6
JournalLuminescence
Volume28
Issue number5
DOIs
Publication statusPublished - Sep 2013

Scopus Subject Areas

  • Biophysics
  • Chemistry (miscellaneous)

User-Defined Keywords

  • Asymmetric Schiff-base complexes
  • NIR luminescence
  • Sensitization and energy transfer

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