ScholarWorks@성균관대학교

초록

The pervasive presence of toroidal architectures across scales, from molecular assemblies to cosmic formations, reveals a universal design principle that integrates aesthetic symmetry with functional topology in nature. Yet, constructing such hierarchical toroidal organization at the nanoscale, particularly for metal nanoclusters, remains an unmet challenge. We present an unprecedented wheel-shaped silver nanocluster, [(V6O19 subset of V22O66)@Ag96( t BuPhC equivalent to C)56(SO4)2(DMF)12]6+ (Ag96), encapsulating an unparalleled hierarchical toroidal [V6O19 subset of V22O66]30- polyoxovanadate (POV). The hierarchical toroidal [V6O19 subset of V22O66]30- mirrors the core-shell geometry of Hoag's Object, a rare ring galaxy, with a Lindqvist-type [V6O19]8- core enclosed by a macrocyclic [V22O66]22- shell. This work constitutes a unique astronomical morphology in coinage metal nanoclusters, uncovering the universal principles of hierarchical self-assembly at the nanoscale. Leveraging the flexibility of POVs, we further isolated a bowl-shaped [(SO4@V15O42)@Ag46( t BuPhC equivalent to C)31(DMF)2]4+ (Ag46), encapsulating an open-cage [SO4@V15O42]11- template by regulating the stoichiometric ratio. Due to their distinct structural configurations, these nanoclusters exhibit markedly different photothermal conversion performance when exposed to visible or near-infrared (NIR) lasers. This breakthrough positions POVs as versatile templates for engineering complex metal nanoclusters, opening new frontiers in materials science and nanotechnology.

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