Wu Yuandong, Bensch Wolfgang
Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Olshausenstrasse 40 (Otto-Hahn Platz 6-7), D-24098 Kiel, Germany.
Inorg Chem. 2009 Apr 6;48(7):2729-31. doi: 10.1021/ic802368j.
The new compounds K(2)Ln(2)As(2)Se(9) (Ln = Sm, Gd) were obtained by applying the reactive flux method. The structure consists of a three-dimensional (3D) Ln(2)As(2)Se(9) framework with K(+) ion-filling tunnels running along the b axis. The two unique Ln(3+) cations are coordinated by two Se(2)(2-) dumbbells, two AsSe(3)(3-) pyramids, and one chairlike As(2)Se(4)(2-) unit in a bicapped trigonal-prismatic geometry. The Ln(3+)-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 Se(2-) anions on the capped sites of the trigonal prisms. The As(2)Se(4) units connect these layers to form the 3D framework.
通过反应助熔剂法获得了新化合物K₂Ln₂As₂Se₉（Ln = Sm，Gd）。其结构由三维（3D）[Ln₂As₂Se₉]²⁻骨架组成，K⁺离子填充沿b轴的隧道。两个独特的Ln³⁺阳离子由两个Se₂²⁻哑铃、两个AsSe₃³⁻金字塔和一个椅状As₂Se₄²⁻单元以双帽三角棱柱几何构型配位。以Ln³⁺为中心的三角棱柱与相邻棱柱共享三角形面，沿b轴形成一维链。这些链通过在三角棱柱帽位点共享Se²⁻阴离子相互连接形成层。As₂Se₄单元连接这些层以形成3D骨架。
