ChemInform Abstract: Li2PbGeS4 and Li2EuGeS4: Polar Chalcopyrites with a Severe Tetragonal Compression.
Abstract
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ChemInform Abstract
The title compounds are prepared by dissolving Pb or Eu and Ge in molten Li2S9 (600—650 °C, 72—96 h). The compounds are characterized by UV/VIS, IR spectroscopy, and electronic structure calculations. As revealed by single crystal XRD, Li2PbGeS4 and Li2EuGeS4 are isotypic and crystallize in the tetragonal space group I
2m with Z = 2. The compounds possess a compressed chalcopyrite-like structure. The coordination sphere for Pb and Eu can be described as a distorted dodecahedron. The (Eu/Pb)S8 dodecahedra share edges and corners with the GeS4 tetrahedra to create small tunnels in which the Li+ cations reside. Both compounds are semiconductors.
