摘要: In conclusion, we have demonstrated the preparation of TPE-derived imidazo[1,5-α]pyridinium salt H4-L(PF6) 4, which was used for accessing dinuclear silver(I) and gold(I) tetracarbene metallacycles [Ag2L](PF6) 2 and [Au2L](PF6) 2. The initially weakly emissive H4-L(PF6) 4 exhibited a remarkable enhancement of fluorescence intensities upon metalation to form the dinuclear silver(I) and gold(I) tetracarbene complexes in dilute solution. Upon the gradual addition of water as a poor solvent to the acetonitrile solution of TPE-derived complexes, the precursor H4-L(PF6) 4 exhibited typical AIE characteristics. However, metal complexes [M2L](PF6) 2 (M = Ag, Au) showed weak emission in aggregated state. Based on this fact, silver(I) tetracarbene complex [Ag2L](PF6) 2 has been employed as a turn-on fluorescent sensor for PA via a self-destructive reaction. This work provides novel insights into the fabrication of stimulus-responsive organometallic materials with potential applications in biological studies.