Optical properties of halogen-bridged mixed-valence complexes, [m(En)2][ptx2(en)2](cio4)4, (m=pt, pd and ni; x = c1, br and i): Effects of metal-alternation

Yoshiki Wada, Tadaoki Mitani, Koshiro Toriumi, Masahiro Yamashita

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56 Citations (Scopus)

Abstract

The effect of metal alternation (Pt and M) in linear-chain halogen-bridged mixed-valence complexes, [M(en)2][PtX2(en)2](CIO4)4, (X=C1, Br and I; M=Pt, Pd and Ni; en = ethylenediamine), has been investigated using polarized reflection measurements. The electronic absorption spectra of these materials, obtained by applying the Kramers-Kronig relation to the reflectivity data, show two distinctive charge-transfer exciton bands associated with the inter-metal transitions, “M-Pt”, and the transitions from halogen ions to metal ions, “X-Pt”. On substitution of M=Pt by Pd or Ni, the absorption intensity of the “X-Pt” exciton was enhanced in contrast to the reduction of the “M-Pt” exciton intensity. The intensity borrowing between these two excitons is consistent with a numerical calculation based on a trimer model of the CT exciton transitions.

Original languageEnglish
Pages (from-to)3013-3021
Number of pages9
Journaljournal of the physical society of japan
Volume58
Issue number8
DOIs
Publication statusPublished - 1989

Keywords

  • Charge transfer
  • Exciton
  • Halogen-bridged mixed-valence complexes
  • Kramers-Kronig transformation
  • Metal substitution
  • Optical properties
  • Reflectivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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