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An Anti CuO 2 ‐type Metal Hydride Square Net Structure in Ln 2 M 2 As 2 H x (Ln=La or Sm, M=Ti, V, Cr, or Mn)
Author(s) -
Mizoguchi Hiroshi,
Park SangWon,
Hiraka Haruhiro,
Ikeda Kazutaka,
Otomo Toshiya,
Hosono Hideo
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201409023
Subject(s) - crystallography , tetragonal crystal system , hydride , metal , fluorite , chemistry , ion , ionic bonding , transition metal , inorganic chemistry , crystal structure , materials science , organic chemistry , biochemistry , catalysis
Using a high pressure technique and the strong donating nature of H − , a new series of tetragonal La 2 Fe 2 Se 2 O 3 ‐type layered mixed‐anion arsenides, Ln 2 M 2 As 2 H x , was synthesized (Ln=La or Sm, M=Ti, V, Cr, or Mn; x ≈3). In these compounds, an unusual M 2 H square net, which has anti CuO 2 square net structures accompanying two As 3− ions, is sandwiched by (LaH) 2 fluorite layers. Notably, strong metal–metal bonding with a distance of 2.80 Å was confirmed in La 2 Ti 2 As 2 H 2.3 , which has metallic properties. In fact, these compounds are situated near the boundary between salt‐like ionic hydrides and transition‐metal hydrides with metallic characters.