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Controlled synthesis and photothermal conversion of Ag+-triggered-hetero-/homo-metallic cages including ring-in-ring systems
Ming-Yu Lu, Ming Liu, Ruo-Tong You, Jian-Xin Yang, Shui-Ren Liu, Li-Long Dang*, Lu-Fang Ma
https://doi.org/10.1016/j.cjsc.2026.101100
Coordination-driven self-assembly; Structural regulation; Ring-in-Ring; π-π stacking interaction; Photothermal conversion
ABSTRACT
Achieving precise structural regulation of coordination topological assemblies, while simultaneously elucidating the structure–function relationships dictated by distinct architectures, remains a central challenge. Herein, a multifunctional ligand L bearing both pyridyl and imidazolyl moieties is elaborately designed. Self-assembly of this ligand with a series of distinct building blocks yields complex systems with diverse topologies, including homometallic and heterometallic cages structures as well as Ring-in-Ring architectures. Experimental analyses demonstrate that the introduction of Ag+ ions can induce structural transformation, enabling the construction of heterometallic assemblies with unique topological features. Structural analysis of all compounds, which are fully characterized by single-crystal X-ray diffraction (SC-XRD) and nuclear magnetic resonance (NMR), reveals the formation mechanism of each topological architecture. The resulting assemblies exhibit strikingly distinct near-infrared (NIR) photothermal conversion performance, with the optimal sample attaining a favorable photothermal conversion efficiency of 55.0%. This study establishes a critical theoretical architecture for the rational design of innovative topological supramolecular photothermal materials.
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