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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >On coinage metal mercury chalcogenide halides II: Hydrothermal synthesis, crystal structure, and solid state phase transition of CuHgSCl and CuHgSBr [German]
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On coinage metal mercury chalcogenide halides II: Hydrothermal synthesis, crystal structure, and solid state phase transition of CuHgSCl and CuHgSBr [German]

机译:关于造币金属汞硫属元素卤化物II:CuHgSCl和CuHgSBr的水热合成,晶体结构和固态相变[德国]

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The hydrothermal reaction of CuCl and CuBr with HgS in concentrated aqueous HX (X = Cl, Br) as solvent at 670 K in sealed glass ampoules yields yellow-orange crystals of CuHgSCI and CuHgSBr. Both compounds crystallize isotypically (orthorhombic, Pbam, a = 984.01(8), b = 1775.1(2), c = 409.59(3) pm for CuHgSCI and a = 1003.7(4), b = 1833.6(5), c = 412.4(2) pm for CuHgSBr, Z = 8). The structures consist of plane folded HgS chains connected by pairs of distorted CUS2X2 tetrahedra sharing the X-X-edge (X = Cl, Br) in which the copper atoms occupy off-centered positions. The large displacement factors of the Cu atoms represent thermal vibrations as shown by additional X-ray investigations at different temperatures. The single-crystal structure determination shows that the earlier structure model, based on powder diffraction data, is incorrect. The structure type of CuHgSCI and CuHgSBr shows distinct similarities to the structure type of the already known compounds CuHgSeBr, AgHgSBr and AgHgSI (MHgYX). At 323 K CuHgSBr undergoes a second order phase transition into a higher symmetric structure of the MHgYX type (orthorhombic, Pmam, a = 1009.2(3), b = 918.40(4), c = 413.81(2) pm) with halved b-axis. [References: 22]
机译:在密闭玻璃安瓿中,在670 K的浓HX水溶液(X = Cl,Br)中,CuCl和CuBr与HgS进行水热反应,生成CuHgSCI和CuHgSBr的橙黄色晶体。两种化合物都是同型结晶的(斜方晶系,Pbam,a = 984.01(8),b = 1775.1(2),c = 409.59(3)pm对于CuHgSCI和a = 1003.7(4),b = 1833.6(5),c = 412.4 (2)对于CuHgSBr,Z = 8)。该结构由平面折叠的HgS链组成,这些HgS链由成对的扭曲CUS2X2四面体连接,它们共享X-X边缘(X = Cl,Br),其中铜原子占据偏心位置。铜原子的大位移因子代表热振动,如在不同温度下进行的其他X射线研究所示。单晶结构确定表明,基于粉末衍射数据的早期结构模型是错误的。 CuHgSCI和CuHgSBr的结构类型与已知化合物CuHgSeBr,AgHgSBr和AgHgSI(MHgYX)的结构类型表现出明显的相似性。在323 K处CuHgSBr经历了二级相变,转变为MHgYX类型的高对称结构(斜方晶系,Pmam,a = 1009.2(3),b = 918.40(4),c = 413.81(2)pm),而b-减半轴。 [参考:22]

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