Two dimensional materials beyond graphene are in forefront research. Two dimensional analogues of graphene of group 14, germanene, are of high importance for their electronic and optical properties. The commonly used deintercalation fabrication approach has reached a major bottleneck in the field due to the lack of versatility derived from the limited library of precursors available for 2D-Ge functionalization with terminal groups. Thus, a chemical procedure that would allow for the on-demand synthesis of functional 2D-Ge derivatives with tuned physicochemical features for task-specific applications is of utmost importance to advance in the field. To fill this gap, click chemistry is herein presented as a straightforward “one-pot” synthetic strategy to simply reach functional 2D-Ge derivatives by covalently assembling ad hoc thiol-rich active molecular components (R′–SH) upon commercially available allyl 2D-Ge (2D-Ge–CH₂CHCH₂) by taking advantage of a photoinduced thiol–ene click reaction. Consequently, the combination of molecular engineering and Ge-based 2D materials through click chemistry supposes a step forward towards the achievement of a new family of smart 2D-Ge–CH₂CH₂CH₂S–R′ derivatives with different (supra)molecular responsiveness, which goes beyond the state-of-the-art in the field. This approach of functionalization of 2D monoelemental post-graphene material germanene is highly innovative and shall provide universal way of functionalization of germananes.

中文翻译：

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分子“点击”活性部分到锗基无机二维材料

石墨烯以外的二维材料处于前沿研究中。第 14 族石墨烯的二维类似物锗烯因其电子和光学特性而非常重要。由于可用于带末端基团的2D-Ge功能化的前体库有限，因此缺乏通用性，因此常用的脱嵌制造方法已成为该领域的主要瓶颈。因此，一种允许按需合成功能性2D-Ge衍生物的化学程序，具有针对特定任务应用的调谐物理化学特征，对于在该领域取得进展至关重要。为了填补这一空白，点击化学在此作为一种简单的“一锅法”合成策略来简单地实现功能2D-Ge衍生物，通过利用光诱导的硫醇-烯点击反应，在市售的烯丙基2D-Ge ( 2D-Ge-CH ₂ CH CH ₂ ) 上共价组装特设富含硫醇的活性分子组分 ( R'-SH ) . 因此，通过点击化学将分子工程与基于 Ge 的二维材料相结合，朝着实现智能2D-Ge–CH ₂ CH ₂ CH ₂ S–R'新家族迈出了一步具有不同（超）分子反应性的衍生物，超越了该领域的最新技术水平。这种二维单元素后石墨烯材料锗烯的功能化方法具有高度创新性，将为锗烷提供通用的功能化方法。