Dinuclear fused salen complexes of group-10 metals: Peculiarity of the crystal structure and near-infrared luminescence of a bis(Pt-salen) complex

Hirohiko Houjou, Yuki Hoga, Yi Lan Ma, Hiroto Achira, Isao Yoshikawa, Toshiki Mutai, Kazunari Matsumura

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Dinuclear fused salen complexes with Ni, Pd, and Pt nuclei were synthesized, and their crystal structures were determined. In the crystal structure of the Pt complexes, the molecules were virtually planar and formed a closely stacked dimer every two molecules, whose Pt—Pt interatomic distance was 3.43 Å. The absorption spectra of the dinuclear salen complexes were similar to each other both in solution and in the solid state. The dinuclear Pt complex exhibited photoluminescence, presumably related to the π-conjugated system of the naphthalene ring, both in solution and in the solid state. The low-energy emission, corresponding to a longer wavelength compared to that of analogous mononuclear complexes, ranged to the near-infrared region, suggesting that the naphthalene ring is perturbed by the adjoining chelate rings as if these moieties formed a fused aromatic ring system.

Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalInorganica Chimica Acta
Publication statusPublished - 2017 May 1



  • Metal-metal contact
  • Near-infrared emission
  • Photoluminescence
  • Quasi aromaticity
  • π-Conjugated system

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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