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首页> 外文期刊>Crystallography reports >New layer megaborate Sm _3[B _13O _22(OH) _3](OH) · 3H _2O and its place in the structural systematics
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New layer megaborate Sm _3[B _13O _22(OH) _3](OH) · 3H _2O and its place in the structural systematics

机译:新层兆硼酸盐Sm _3 [B _13O _22(OH)_3](OH)·3H _2O及其在结构系统中的位置

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Crystals of a new aqueous rare earth borate Sm _3[B _13O _22(OH) _3](OH) · 3H _2O, space group P2/c, are obtained under hydrothermal conditions. The structure is determined by the heavy-atom method without preliminary knowledge of the chemical formula. The anionic radical is a boron-oxygen sheet in which two corrugated layers are related by centers of inversion. An independent layer is akin to pentaborate layers; it differs from the layer in (Nd _(0.925)Na _(0.075))Nd[B _9O _(15)(OH) _2]Cl _(0.85) · 2.65H _2O by an additional branch in the form of a 4: (3[2Δ + 1T] + 1Δ) group. The intersheet space and large holes of the sheet accommodate Sm atoms, (OH) groups, and water molecules. The new Sm-borate and the related Nd-borate are polyborates (megaborates) with complex anionic radicals. In the Sm-borate, the new two-dimensional [B _(13)O _22(OH) _3] _(∞∞) complex anionic radical of the 13{(4: [2T + 2Δ]) _(∞) + (5: [3T + 2Δ] + 4: (3[2Δ + 1T] +1Δ)) _(∞)} _(∞∞) formula is built of three different blocks, unlike the [B _9O _(15)(OH) _2] _(∞∞) radical of the 9{(4: [2T + 2Δ]) _(∞) + (5: [3T + 2Δ]) _(∞)} _(∞∞) formula in the Nd-borate, which consists of two blocks. The rule of the inverse relationship between the polymerization degrees of the boron-oxygen radical and rare earth polyhedra holds for both borates.
机译:在水热条件下,获得了一种新的稀土硼酸盐水溶液Sm _3 [B _13O _22(OH)_3](OH)·3H _2O的晶体,空间群P2 / c。该结构是通过重原子方法确定的,而没有化学式的初步知识。阴离子自由基是硼-氧片,其中两个波纹层通过反转中心相连。独立层类似于五层的层。它与(Nd _(0.925)Na _(0.075))Nd [B _9O _(15)(OH)_2] Cl _(0.85)·2.65H _2O的层的不同之处在于附加分支形式为4 :(3 [2Δ+ 1T] +1Δ)组。薄片之间的间隙和薄片的大孔容纳Sm原子,(OH)基和水分子。新的Sm-硼酸酯和相关的Nd-硼酸酯是具有复杂阴离子基团的多硼酸酯(兆硼酸酯)。在Sm-硼酸盐中,新的13 {(4:[2T +2Δ])_(∞)+的二维[B _(13)O _22(OH)_3] _(∞∞)复杂阴离子自由基(5:[3T +2Δ] + 4:(3 [2Δ+ 1T] +1Δ))_(∞)} _(∞∞)公式由三个不同的块构成,与[B _9O _(15)( OH)_2] _(∞∞)的9 {(4:[2T +2Δ])_(∞)+(5:[3T +2Δ])_(∞)} _(∞∞)根硼酸钕,由两个嵌段组成。对于两种硼酸盐,硼-氧自由基的聚合度与稀土多面体之间的反比关系的规则成立。

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