Weil Matthias, Stöger Berthold
Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria.
Acta Crystallogr Sect E Struct Rep Online. 2010 Jan 16;66(Pt 2):i7. doi: 10.1107/S1600536809053604.
Single crystals of the title compound, trilead(II) bis-[tellurate(IV)] dibromide, have been grown under hydro-thermal conditions. The structure is isotypic with that of the chloride analogue, Pb(3)Te(2)O(6)Cl(2), and consists of three Pb, two Te, two Br and four O atoms in the asymmetric unit. Except for two of the O atoms, all atoms are located on mirror planes. The Pb(3)Te(2)O(6)Br(2) structure can be described as being built up from (∞) (2)Pb(3)Te(2)O(6) layers extending parallel to (20) and Br(-) anions between the layers. Cohesion of the structure is accomplished through Pb-Br contacts of two of the three lead atoms, leading to highly asymmetric coordination polyhedra. The lone-pair electrons of both Te(IV) and Pb(II) atoms are stereochemically active and point towards the anionic halide layers.
标题化合物二溴化双[碲(IV)酸]三铅(II)的单晶已在水热条件下生长出来。其结构与氯化物类似物Pb₃Te₂O₆Cl₂的结构同型，不对称单元中包含三个Pb、两个Te、两个Br和四个O原子。除了两个O原子外，所有原子都位于镜面平面上。Pb₃Te₂O₆Br₂的结构可描述为由平行于(20)方向延伸的(∞)₂[Pb₃Te₂O₆]²⁺层以及层间的Br⁻阴离子构成。结构的内聚力通过三个铅原子中两个的Pb - Br接触实现，导致配位多面体高度不对称。Te(IV)和Pb(II)原子的孤对电子在立体化学上具有活性，并指向阴离子卤化物层。
