An Anti CuO2‐type Metal Hydride Square Net Structure in Ln2M2As2Hx (Ln=La or Sm, M=Ti, V, Cr, or Mn)
- 10 November 2014
- journal article
- research article
- Published by Wiley in Angewandte Chemie International Edition
- Vol. 54 (10) , 2932-2935
Abstract
Using a high pressure technique and the strong donating nature of H−, a new series of tetragonal La2Fe2Se2O3-type layered mixed-anion arsenides, Ln2M2As2Hx, was synthesized (Ln=La or Sm, M=Ti, V, Cr, or Mn; x≈3). In these compounds, an unusual M2H square net, which has anti CuO2 square net structures accompanying two As3− ions, is sandwiched by (LaH)2 fluorite layers. Notably, strong metal–metal bonding with a distance of 2.80 Å was confirmed in La2Ti2As2H2.3, 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.Keywords
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