An Aggregation-Induced Emissive Platinum(II) Metallacycle as the Energy Donor of Rhodols for Ratiometric Detection of Hydrazine

Industry-produced hydrazine (N 2 H 4 ) is released into the environment, posing a major risk to human health and the ecosystem. Therefore, it is imperative to develop an effective and convenient method for the detection of N 2 H 4 . Herein, artificial light-harvesting systems (ALHSs) for N 2 H 4 detection were constructed by applying an aggregation-induced emission-active platinum(II) metallacycle ( TPEMc ) as the energy donor and rhodols ( P1, P2, and P3 ) as the energy acceptors. The ratiometric fluorescence probes based on ALHSs for N 2 H 4 showed obvious signal amplification and lower limits of detection compared to those of rhodols ( P1, P2, P3 ) alone. The TPEMc –rhodols systems clearly demonstrated a noticeable increase in fluorescence intensity at 550 nm and an obvious fluorescent color shift from cyan to yellow in the presence of N 2 H 4 . Fascinatingly, N 2 H 4 could be visually and quantitatively detected in water by the TPEMc –rhodol systems paired with smartphone RGB analysis. Therefore, the combination of platinum(II) metallacycle with rhodols is a promising strategy for simple, sensitive, and visual detection of N 2 H 4 .