Short Radiative Lifetime and Non-Triplet Sensitization in Near-Infrared-Luminescent Yb(III) Complex with Tripodal Schiff Base

Atsuko Masuya-Suzuki, Satoshi Goto, Takafumi Kambe, Ryunosuke Karashimada, Yasuhiro Kubota, Nobuhiko Iki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We prepared Ln(III) (Ln=Eu, Gd, and Yb) complexes with a tripodal Schiff base, tris[2-(5-methylsalicylideneimino)ethyl]amine (H3L) and studied their photophysical properties. Upon ligand excitation, YbL showed Yb(III)-centered luminescence in the near-infrared region. While the overall quantum yield (0.60(1)%) of YbL in acetonitrile was moderate among the reported values for Yb(III) complexes, its radiative lifetime (0.33(2) ms) was significantly shorter than those reported previously. We propose that the ligand-to-metal charge-transfer (LMCT) state mediated the sensitization in YbL. The emission and excitation spectra of EuL indicated the participation of the LMCT state in the sensitization. The radiative lifetime (0.84(7) ms) for EuL in the solid state was rather short compared to those of reported Eu(III) complexes. Our results show that the Yb(III) complex with the Schiff base ligand has two features: the short radiative lifetime and the non-triplet sensitization path.

Original languageEnglish
Pages (from-to)46-55
Number of pages10
JournalChemistryOpen
Volume10
Issue number1
DOIs
Publication statusPublished - 2021 Jan

Keywords

  • N,O ligands
  • charge transfer
  • luminescence
  • tripodal ligand
  • ytterbium

ASJC Scopus subject areas

  • Chemistry(all)

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