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Highly luminescent and multi-sensing aggregates co-assembled from Eu-containing polyoxometalate and an enzyme-responsive surfactant in water

Abstract

Hybrid co-assembly of polyoxometalates (POMs) with cationic organic matrices offers a preferable way to greatly enhance POMs’ functionality as well as processability. Thus, multi-stimuli responsive supramolecular materials based on lanthanide-containing POM with improved luminescence may be fabricated from appropriate components through this convenient strategy. Herein, we reported that the co-assembly from Na9(EuW10O36)•32H2O (EuW10) and a commercially available cationic surfactant, myristoylcholine chloride (Myr), in water could produce enhanced red-emitting luminescent aggregates, with their photophysical properties highly dependent on the molar ratio (R) between Myr and EuW10. R of 36 was finally selected owing to the displayed superior luminescence intensity and good aggregate stability. The Myr/EuW10 hybrids induced by electrostatic and hydrophobic forces presented practically as multilamellar spheres with diameters varying from 80 to 300 nm. Compared to aqueous solution of EuW10 nanocluster, a 12-fold increase in absolute luminescence quantum yield (~23.3 %) was observed for hybrid spheres, which was ascribed to the efficient shielding of water molecules. An unusual aggregation arrangement mechanism and the excellent photophysical properties for these aggregates were thoroughly investigated. Both the enzyme substrate character of Myr and the sensitive coordination structure of EuW10 to surrounding environment made Myr/EuW10 aggregates exhibit multi-stimuli responsiveness to enzyme, pH, and transition metal ions, and thus providing potential applications in fluorescent sensing, target-releasing, and optoelectronics.

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Publication details

The article was received on 07 Nov 2018, accepted on 07 Dec 2018 and first published on 07 Dec 2018


Article type: Paper
DOI: 10.1039/C8SM02276C
Citation: Soft Matter, 2018, Accepted Manuscript
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    Highly luminescent and multi-sensing aggregates co-assembled from Eu-containing polyoxometalate and an enzyme-responsive surfactant in water

    N. Lei, D. Shen and X. Chen, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM02276C

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