Organic–Inorganic Hybrid Gold Halide Perovskites: Structural Diversity through Cation Size

Hideaki Murasugi, Shohei Kumagai, Hiroaki Iguchi, Masahiro Yamashita, Shinya Takaishi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Crystal structures of a series of organic–inorganic hybrid gold iodide perovskites, formulated as A2[AuII2][AuIIII4] [A=methylammonium (MA) (1) and formamidinium (FA) (2)], A′2[I3]1−x[AuII2]x[AuIIII4] [A′=imidazolium (IMD) (3), guanidinium (GUA) (4), dimethylammonium (DMA) (5), pyridinium (PY) (6), and piperizinium (PIP) (7)], systematically changed depending on the cation size. In addition, triiodide (I3) ions were partly incorporated into the AuI2 sites of 3–7, whereas they were not incorporated into those of 1 and 2. Such a difference comes from the size of the organic cation. Optical absorption spectra showed characteristic intervalence charge-transfer bands from AuI to AuIII species, and the optical band gap increased as the size of the cation became larger.

Original languageEnglish
Pages (from-to)9885-9891
Number of pages7
JournalChemistry - A European Journal
Issue number42
Publication statusPublished - 2019 Jul 25


  • charge transfer
  • coordination chemistry
  • mixed valence
  • organic–inorganic perovskites
  • solar cells


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