The uncontrolled assembly of Al(III) octahedra makes the synthesis of related two-dimensional (2D) compounds unpredictable, thus limiting their potential applications. In contrast to traditional synthesis methods, we propose a stepwise synthetic approach based on aluminum molecular rings. By fine-tuning the angle of the coordination unit and direction of anchoring modulation, a zero-dimensional (0D) aluminum molecular ring (AlOC-196) can be successfully preserved as a unique building block, allowing for the construction of a targeted 2D configuration (AlOC-197). Notably, the weak interlayer interactions facilitate its further exfoliation process. Moreover, compared to bulk crystals, nanosheets produced through liquid-phase exfoliation exhibit enhanced third-order nonlinear optical (NLO) properties. This coordination-driven self-assembly strategy shows promise in expanding the structural diversity and functionality of layered materials.

中文翻译：

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前所未有的铝分子环基层，具有可定制的光学限制效果


Al（III） 八面体的不受控制的组装使相关二维 （2D） 化合物的合成变得不可预测，从而限制了它们的潜在应用。与传统的合成方法相比，我们提出了一种基于铝分子环的逐步合成方法。通过微调配位单元的角度和锚定调制的方向，可以成功地将零维 （0D） 铝分子环 （AlOC-196） 保留为独特的构建块，从而允许构建目标 2D 构型 （AlOC-197）。值得注意的是，弱的层间相互作用促进了其进一步的剥离过程。此外，与块状晶体相比，通过液相剥离产生的纳米片表现出增强的三阶非线性光学 （NLO） 特性。这种协调驱动的自组装策略在扩展分层材料的结构多样性和功能方面显示出前景。