Photoluminescent sensing vesicle platform self-assembled by polyoxometalate and ionic-liquid-type imidazolium gemini surfactants for the detection of Cr and MnO ions.

In this paper, in order to successfully achieve a fluorescent polyoxometalate (POM) probe with high luminescence, aggregation enhanced emission of POM is achieved by a self-assembly strategy. In detail, Eu-polyoxometalate (Na[EuWO]·32HO (EuW)) and ionic-liquid-type imidazolium gemini surfactants ([C-n-Cim]Br, n = 2, 4, 6) constructed a vesicle with aggregation enhanced emission phenomenon. With the introduction of [C-n-Cim]Br, the luminescence intensity increased sharply and compared the effect of the different space length of [C-n-Cim]Br, the introduction of [C-2-Cim]Br had the best luminescence effect and the strongest luminescence of EuW/[C-2-Cim]Br was 32 times that of pure EuW.