Synthesis of Platinum(Ⅱ)Metallacycle with Aggregation-induced Emission Property
Platinum(Ⅱ)metallacycle containing tetraphenylethene(TPE)moieties exhibits excellent aggregation-induced emission(AIE)properties and hold great potential for constructing artificial light-harvesting systems.To obtain a novel platinum(Ⅱ)metallacycle with excellent AIE properties,4,4-dibromotetraphenylethene was initially nitrated to obtain compound 2,subsequently reduced to yield compound 3.Compound 4 was synthesized via the condensation reaction between compound 3 and lauroyl chloride.The tetraphenylethene derivative 5 was obtained through Sonogashira coupling of 4 with 4-ethynylpyridine hydrochloride.A hexagonal platinum(Ⅱ)metallacycle 7 was synthesized through[3 +3]coordination driven self-assembly between 5 and platinum(Ⅱ)metal ligand 6.The structure of compound 7 was characterized using NMR,MS and UV-Vis spectrum.The results indicate that Compound 7 exhibited a maximum absorption peak at 302 nm,as observed from the UV-visible absorption spectrum.Fluorescence spectroscopy indicated that the fluorescence intensity of Compound 7 was extremely low in a DMSO/H2O mixed solvent with a water content(volume fraction,same be-low)below 20％.However,the fluorescence intensity increased significantly when the water content increased to 30％,demonstrating its excellent AIE properties.
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