Fig. 4: Characterization and applications of Ag₄/TNT.

a–c TEM images of Ag₄/TNT. d Recoverability of Ag₄/TNT catalysts in the cyclization of propargylamine with CO₂. reaction conditions: Ag₄/TNT (50 mg, 1.6 wt% loading of NCs), N-benzylprop-2-yn-1-amine (0.5 mmol), DBU (0.05 mmol), acetonitrile (1.0 mL), 25 °C, 12 h, CO₂ balloon. e Gram scale experiment.