K<sub>2</sub>Ln<sub>2</sub>As<sub>2</sub>Se<sub>9</sub> (Ln = Sm, Gd): The First Quaternary Rare-Earth Selenoarsenate Compounds with a 3D Framework Containing Chairlike As<sub>2</sub>Se<sub>4</sub> Units
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The new compounds K2Ln2As2Se9 (Ln = Sm, Gd) were obtained by applying the reactive flux method. The structure consists of a three-dimensional (3D) [Ln2As2Se9]2− framework with K+ ion-filling tunnels running along the b axis. The two unique Ln3+ cations are coordinated by two Se22− dumbbells, two AsSe33− pyramids, and one chairlike As2Se42− unit in a bicapped trigonal-prismatic geometry. The Ln3+-centered trigonal prisms share triangular faces with neighboring prisms, forming one-dimensional chains along the b axis. These chains are linked to each other to form layers by sharing Se2− anions on the capped sites of the trigonal prisms. The As2Se4 units connect these layers to form the 3D framework.
创建时间：
2016-02-26
