ArticleChemistry, an Asian journal2026
The Selective Synthesis and Photothermal Conversion Properties of U- and S-Shaped Flexible Double-Metallacycle Assemblies.
Article in Chemistry, an Asian journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Molecular double-metallacycles have drawn considerable interest for their unique architectures and broad application prospects, yet selective synthesis remains a significant challenge. This work reports a novel triimidazolyl flexible ligand precursor L1 containing a phenyl unit with three methyl groups and three methylene spacers that enable flexibility for the coordination of imidazole units. Together with three half-sandwich rhodium building blocks (B1-B3) of varying conjugation sizes, L1 was assembled via coordination-driven self-assembly and silver-ion bridging to afford one U-shaped and two S-shaped double-metallacycles in high yields. The greater steric demand of B2 and B3 favored the S-shaped topology. The formation of all target structures was clearly confirmed by SC-XRD (Single-crystal x-ray diffraction analysis), NMR (Nuclear magnetic resonance) spectroscopy, IR (Infrared) spectroscopy, and ESI-TOF-MS (Electrospray Ionization-Time of Flight Mass) spectrometry. TGA (Thermogravimetric analysis) indicated good thermal stability for compounds 1-3. Photothermal conversion experiments revealed that S-shaped double-metallacycle 3 achieves notable photothermal conversion efficiency (21.46%-22.95%) in the NlR (near-infrared) region. EPR (Electron paramagnetic resonance) studies further corroborated that radical generation from the building blocks enhances photothermal performance.
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