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<p>Sandwich-type complexes are a class of metallocene-like assemblies known for their exceptional stability and physicochemical properties. In this study, we designed and synthesized a heptanuclear all-metal sandwich structure (termed <b>Au</b><sub><b>6</b></sub><b>Ag</b>) with a silver ion capped by two cyclic trinuclear gold(I)-pyrazolates. <b>Au</b><sub><b>6</b></sub><b>Ag</b> is soluble in dichloromethane and can self-assemble into a metallogel through intermolecular gold-gold interactions and multiple hydrogen bonds. The reversible transformation of <b>Au</b><sub><b>6</b></sub><b>Ag</b> between solid, solution, and gel states can be achieved through dissolution/dilution, aging, and drying processes. In all states, <b>Au</b><sub><b>6</b></sub><b>Ag</b> maintains a consistent bright green phosphorescence with a record-high quantum yield of 47.5% in gel form and over 96% in a diluted solution free of oxygen quenching. We envision that <b>Au</b><sub><b>6</b></sub><b>Ag</b> has great potential in luminescence and bioimaging applications as a stable phosphorescent gel material.</p>

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Ultra-high phosphorescence efficiency in an all-metal sandwich-type metallogel

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Ruo-Yan Yu,
  • Zhou Lu,
  • Yu-Jie Yang,
  • Yan Wang,
  • Xin-Yi Liu,
  • Xue-Zhi Wang,
  • Dong Luo,
  • Wen-Xiu Ni,
  • Mian Li,
  • Mo Xie,
  • Weigang Lu,
  • Dan Li

摘要

Sandwich-type complexes are a class of metallocene-like assemblies known for their exceptional stability and physicochemical properties. In this study, we designed and synthesized a heptanuclear all-metal sandwich structure (termed Au6Ag) with a silver ion capped by two cyclic trinuclear gold(I)-pyrazolates. Au6Ag is soluble in dichloromethane and can self-assemble into a metallogel through intermolecular gold-gold interactions and multiple hydrogen bonds. The reversible transformation of Au6Ag between solid, solution, and gel states can be achieved through dissolution/dilution, aging, and drying processes. In all states, Au6Ag maintains a consistent bright green phosphorescence with a record-high quantum yield of 47.5% in gel form and over 96% in a diluted solution free of oxygen quenching. We envision that Au6Ag has great potential in luminescence and bioimaging applications as a stable phosphorescent gel material.