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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. Thus, a sensitive selective off-luminescence chemical sensor EuW/[C-2-Cim]Br was developed for the label-free detection of Cr and MnO in aqueous solution with lower detection limits of 0.926 μM and 1.70 μM, respectively. Collision between the fluorophore and Cr or MnO caused dynamic quenching. Luminescence quenching of Cr was attributed to Förster resonance energy transfer (FRET) while luminescence quenching of MnO was attributed to UV-vis competitive absorption. Our strategy for combining polyoxometalates with surfactants to construct aggregation enhanced emission systems is expected to provide new ways to develop simple, economical, fast and sensitive sensors in environmental applications such as metal ion detection.
This article was published in the following journal.
Name: Journal of colloid and interface science
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A class of G-protein-coupled receptors that react to varying extracellular CALCIUM levels. Calcium-sensing receptors in the PARATHYROID GLANDS play an important role in the maintenance of calcium HOMEOSTASIS by regulating the release of PARATHYROID HORMONE. They differ from INTRACELLULAR CALCIUM-SENSING PROTEINS which sense intracellular calcium levels.
The secretory proteins of the seminal vesicles are proteins and enzymes that are important in the rapid clotting of the ejaculate. The major clotting protein is seminal vesicle-specific antigen. Many of these seminal vesicle proteins are under androgen regulation, and are substrates for the prostatic enzymes, such as the PROSTATE-SPECIFIC ANTIGEN, a protease and an esterase.
A member of the vesicle associated membrane protein family. It has a broad tissue distribution and is involved in MEMBRANE FUSION events of the endocytic pathways.
Process whereby a cell, bodily structure, or organism (animal or plant) receives or detects a gravity stimulus. Gravity sensing plays an important role in the directional growth and development of an organism (GRAVITROPISM).
A member of the vesicle-associated membrane protein family involved in the MEMBRANE FUSION of TRANSPORT VESICLES to their target membrane.