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High-Pressure Synthesis of A2 NiO2 Ag2 Se2 (A=Sr, Ba) with a High-Spin Ni2+ in Square-Planar Coordination.


ABSTRACT: Square-planar coordinate Ni2+ ions in oxides are exclusively limited to a low-spin state (S=0) owing to extensive crystal field splitting. Layered oxychalcogenides A2 NiII O2 Ag2 Se2 (A=Sr, Ba) with the S=1 NiO2 square lattice are now reported. The structural analysis revealed that the Ni2+ ion is under-bonded by a significant tensile strain from neighboring Ag2 Se2 layers, leading to the reduction in crystal field splitting. Ba2 NiO2 Ag2 Se2 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 NiO2 square lattice by taking the advantage of the difference in compressibility in oxide and selenide layers.

SUBMITTER: Matsumoto Y 

PROVIDER: S-EPMC6993455 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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

Matsumoto Yuki Y   Yamamoto Takafumi T   Nakano Kousuke K   Takatsu Hiroshi H   Murakami Taito T   Hongo Kenta K   Maezono Ryo R   Ogino Hiraku H   Song Dongjoon D   Brown Craig M CM   Tassel Cédric C   Kageyama Hiroshi H  

Angewandte Chemie (International ed. in English) 20181217 3


Square-planar coordinate Ni<sup>2+</sup> ions in oxides are exclusively limited to a low-spin state (S=0) owing to extensive crystal field splitting. Layered oxychalcogenides A<sub>2</sub> Ni<sup>II</sup> O<sub>2</sub> Ag<sub>2</sub> Se<sub>2</sub> (A=Sr, Ba) with the S=1 NiO<sub>2</sub> square lattice are now reported. The structural analysis revealed that the Ni<sup>2+</sup> ion is under-bonded by a significant tensile strain from neighboring Ag<sub>2</sub> Se<sub>2</sub> layers, leading to th  ...[more]

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