We have successfully synthesized a rare example of inorganic layered materials possessing a positive charge, which is well outside the isostructural set of layered double hydroxides. This layered architecture consists of two-dimensional corrugated [Sb₂O₂(OH)]⁺ layers with linear α,ω-alkanedisulfonate anions residing in the interlamellar space. This cationic material displays a chemical robustness under highly acidic aqueous conditions (pH = 1). Combining the robust nature and the high density of Sb^III sites on the exposed crystal facets, our cationic layered material is an efficient, recyclable catalyst for cyanosilylation of benzaldehyde derivatives with trimethylsilyl cyanide. In addition, the Lewis acidity of the Sb^III sites also catalyzes the ketalization of carbonyl groups under “green” solvent-free conditions.

中文翻译：

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用于路易斯酸催化的氢氧化锑的阳离子二维无机网络†

我们已经成功地合成了一个稀有的，具有正电荷的无机层状材料的实例，该材料完全位于层状双氢氧化物的同构结构之外。该层状结构由二维波纹状[Sb ₂ O ₂（OH）] ⁺层和层间空间中的线性α，ω-链烷二磺酸根阴离子组成。这种阳离子材料在高酸性水溶液条件下（pH = 1）表现出化学稳定性。我们的阳离子层状材料结合了裸露的晶面上Sb ^III位置的坚固性和高密度，是一种高效，可回收的催化剂，用于苯甲醛衍生物与三甲基甲硅烷基氰化物的氰基硅烷化反应。此外，锑的路易斯酸度在“绿色”无溶剂条件下， ^III位还催化羰基的缩酮化。