High-Pressure Synthesis of A 2 NiO 2 Ag 2 Se 2 (A=Sr, Ba) with a High-Spin Ni 2+ in Square-Planar Coordination

Yuki Matsumoto, Takafumi Yamamoto, Kousuke Nakano, Hiroshi Takatsu, Taito Murakami, Kenta Hongo, Ryo Maezono, Hiraku Ogino, Dongjoon Song, Craig M. Brown, Cédric Tassel, Hiroshi Kageyama

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Square-planar coordinate Ni 2+ ions in oxides are exclusively limited to a low-spin state (S=0) owing to extensive crystal field splitting. Layered oxychalcogenides A 2 Ni II O 2 Ag 2 Se 2 (A=Sr, Ba) with the S=1 NiO 2 square lattice are now reported. The structural analysis revealed that the Ni 2+ ion is under-bonded by a significant tensile strain from neighboring Ag 2 Se 2 layers, leading to the reduction in crystal field splitting. Ba 2 NiO 2 Ag 2 Se 2 exhibits a G-type spin order at 130 K, indicating fairly strong in-plane interactions. The high-pressure synthesis employed here possibly assists the expansion of NiO 2 square lattice by taking the advantage of the difference in compressibility in oxide and selenide layers.

Original languageEnglish
Pages (from-to)756-759
Number of pages4
JournalAngewandte Chemie - International Edition
Issue number3
Publication statusPublished - 2019 Jan 14
Externally publishedYes


  • high-pressure synthesis
  • oxychalcogenide
  • spin states
  • square lattice
  • strain

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)


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