The hierarchical assemblies of well-defined structural nanoclusters can help to better understand those of biologically important molecules such as DNA and proteins. Herein, we disclose the synthesis and characterization of a new silver nanocluster, that is Ag₇₀(SR)₄₂(PPh₃)₅ (Ag₇₀-TPP). Directed by the ligands, Ag₇₀-TPP nanoclusters undergo self-hierarchical assembly into a highly space-efficient complex secondary structure of a double helical 4H (DH4H) close packing pattern. The chirality of Ag₇₀-TPP, and the van der Waals forces interactions between the ligands are believed to drive its DH4H arrangement, and the observed interlocking of the phosphine ligands of adjacent Ag₇₀-TPP nanoclusters also contributed. Overall, this work has yielded important and unprecedented insights into the internal structure and crystallographic arrangement of nanoclusters.

中文翻译：

---

Ag70 纳米团簇晶体中具有二级层次复杂性的双螺旋 4H 组装模式

明确定义的结构纳米团簇的分层组装有助于更好地了解具有生物学意义的分子，如 DNA 和蛋白质。在此，我们公开了一种新的银纳米团簇的合成和表征，即 Ag ₇₀ (SR) ₄₂ (PPh ₃ ) ₅ ( Ag ₇₀ -TPP )。在配体的指导下，Ag ₇₀ -TPP纳米团簇经过自分层组装成双螺旋 4H (DH4H) 密堆积模式的高度空间效率的复杂二级结构。Ag ₇₀ -TPP的手性，并且认为配体之间的范德华力相互作用驱动其 DH4H 排列，并且观察到的相邻Ag ₇₀ -TPP纳米团簇的膦配体的互锁也有贡献。总的来说，这项工作对纳米团簇的内部结构和晶体排列产生了重要且前所未有的见解。