Molecular distortion effect on ff-emission in a Pr(III) complex with 4,7-diphenyl-1,10-phenanthroline

Ayumi Ishii, Shinobu Kishi, Hideki Ohtsu, Toshifumi Iimori, Takakazu Nakabayashi, Nobuhiro Ohta, Naoto Tamai, Milan Melnik, Miki Hasegawa, Yuzo Shigesato

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12 Citations (Scopus)


The electronic and structural behaviour of a Pr(III) complex with 4,7-diphenyl-1,10-phenanthroline, [PHbathophen)2NO3) 3], is investigated with respect to the effect of configuration changes on the Pr(III) centre. [Pr(bathophen)2(NO3) 3] luminesces from the excited states of the ligand and the metal ion. The fluorescence, ff-emission (1D23H4), and phosphorescence bands appear at 394, 608.2 and 482 nm, respectively, in the solid state. In acetonitrile, the complex also shows multiple emissions. From the time-resolved emission and the lifetime measurements, the excitation energy-transfer in [Pr(bathophen) 2(NO3)3] is clarified, that is, the upper excited triplet level of the ligand acts as an energy donor, while the 1D2 levels of Pr(III) is the acceptor. Additionally, the emission phenomena of the complex can be modified by molecular distortion, particularly by rotation of the phenyl groups in the ligand.

Original languageEnglish
Pages (from-to)1345-1351
Number of pages7
Issue number9
Publication statusPublished - 2007 Jun 25
Externally publishedYes


  • Donor-acceptor systems
  • Energy transfer
  • Lanthanides
  • Ligand effects
  • Luminescence

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry


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