首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >La[AsO _3]: Lanthanum oxoarsenate(III) with K[ClO _3]-type crystal structure
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La[AsO _3]: Lanthanum oxoarsenate(III) with K[ClO _3]-type crystal structure

机译:La [AsO _3]:具有K [ClO _3]型晶体结构的草酸镧(III)

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摘要

Colorless, transparent single crystals of the lanthanum oxoarsenate(III) La[AsO _3] emerged after exposing an equimolar mixture of La _2O _3 and As _2O _3 to high pressure (11.5 GPa) and high temperature (1000 °C). The air- and water-stable compound crystallizes isotypically with K[ClO _3] and thus can be described in the monoclinic space group P2 _1/m with the lattice constants a = 442.91(4), b = 531.40(5), c = 622.83(6) pm and β = 105.564(3)° for Z = 2. Just like the K ~+ cations in K[ClO _3], the crystallographically unique La ~(3+) cations in La[AsO _3] are surrounded by nine oxygen atoms (d(La ~(3+)-O ~(2-)) = 254-287 pm). The corresponding [LaO _9] ~(15-) polyhedra get first interconnected by two edges to form infinite ∞LaO _7] ~(11-)} chains running along the a axis. These chains generate ∞{[LaO _6] ~(9-)} layers spreading out parallel to the ab plane by vertex-sharing, which are further connected along [001] by common edges to build double layers. The(O1) ~(2-) anions remain terminal and protrude from these double layers in c direction, but finally serve for their condensation in order to erect a three-dimensional anionic ∞LaO _3] ~(3-)} network. Charge compensation is achieved by incorporation of As ~(3+) cations in creating isolated, ? ~1-tetrahedral [AsO _3] ~(3-) units (d(As ~(3+)-O ~(2-)) = 176-177 pm, [ang](O-As-O)= 96-99°). Their lone pairs align along the c axis targeting at opposing La 3+ cations.
机译:将La _2O _3和As _2O _3的等摩尔混合物暴露于高压(11.5 GPa)和高温(1000°C)下后,出现了无色透明的含氧砷酸镧(III)La [AsO _3]单晶。空气和水稳定的化合物以K [ClO _3]同型结晶,因此可以在单斜空间群P2 _1 / m中描述,其晶格常数a = 442.91(4),b = 531.40(5),c = Z = 2时为622.83(6)pm和β= 105.564(3)°。就像K [ClO _3]中的K〜+阳离子一样,La [AsO _3]中晶体学独特的La〜(3+)阳离子被包围由九个氧原子(d(La〜(3 +)-O〜(2-))= 254-287 pm)。相应的[LaO _9]〜(15-)多面体首先通过两个边缘互连,以形成沿a轴延伸的无限∞LaO_7]〜(11-)}链。这些链通过顶点共享生成∞{[LaO _6]〜(9-)}层,该层通过顶点共享平行于ab平面扩展,并通过[001]共同边缘进一步连接以构建双层。 (O1)〜(2-)阴离子保留在末端并从这些双层沿c方向突出,但最终用于它们的缩合,以建立三维阴离子∞LaO_3]〜(3-)}网络。电荷补偿是通过将As〜(3+)阳离子掺入到生成孤立的α中来实现的。 〜1-四面体[AsO _3]〜(3-)单位(d(As〜(3 +)-O〜(2-))= 176-177 pm,[ang](O-As-O)= 96- 99°)。它们的孤对沿着c轴对齐,靶向相反的La 3+阳离子。

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