Abstract
AbstractThe new compound [{(C2H5)2NH2}2In2Ge2S8] · [(C2H5)2NH]0.25 was synthesized under solvothermal conditions using elemental In, Ge, and S in diethylamine. The title compound crystallizes in the orthorhombic space group Pna21 with a = 12.804(3)Å , b = 17.615(4)Å, c = 13.067(3)Å, V = 2947.2Å3, and Z = 4. The structure consists of (In/Ge)S4 tetrahedra as primary building units and four such tetrahadra are joined via common corners to form [In2Ge2S6S4/2]2‐ adamantane‐like building units. These building units are interconnected yielding a three‐dimensional anionic tetrahedral framework resembling that of cristobalite if the adamantane‐like cages are seen as supertetrahedra. Three types of channels with diameters ranging from 8.2 · 10.3Å to 8.5 · 13.1Å intersect the structure. Charge compensation is achieved by [(C2H5)2NH2]+ cations which are located within the voids of the anionic network. The compound decomposes in two steps yielding In2S3 and Ge as solid residue.
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