MX-Chain compounds with ReO4 counterions: Exploration of the robin-day class I-II boundary

Shohei Kumagai, Shinya Takaishi, Mengqi Gao, Hiroaki Iguchi, Brian K. Breedlove, Masahiro Yamashita

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


MX chains have been widely studied as a 1D mixed-valence system. Although there have been a large number of studies on the boundary between class II and III materials of the Robin-Day classification, there are few studies of compounds at the boundary between classes I and II. In this study, we synthesized a series of Pt- and Pd- MX-chain compounds with perrhenate counterions, [M(en)2][M(en)2X2](ReO4)4 (X = Br for M = Pd and X = Cl, Br, and I for M = Pt). All compounds were isostructural, and the metal-metal distances within the chain exceed 6 Å, which is the longest among MX-chain compounds thus far reported. For [Pt(en)2][Pt(en)2Cl2](ReO4)4 (PtCl), an intervalence charge transfer (IVCT) transition was observed in the UV region at 335 nm (3.7 eV), which is the shortest wavelength for the MX-chain compounds thus far reported, indicating that PtCl is the closest to the Robin-Day class I limit.

Original languageEnglish
Pages (from-to)3775-3781
Number of pages7
JournalInorganic chemistry
Issue number7
Publication statusPublished - 2018 Apr 2

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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