title: Highly photoluminescent polyoxometaloeuropate-surfactant complexes by ionic self-assembly.
abstract: Facile organization of the inorganic sandwiched heteropolytungstomolybdate K13[Eu(SiW9Mo2O39)2] (E) into highly ordered supramolecular nanostructured materials by complexation with a series of cationic surfactants is achieved by the ionic self-assembly (ISA) route. The structure and phase behavior of the complexes were examined by IR spectroscopy, differential scanning calorimetry, optical microscopy, and small- and wide-angle X-ray scattering. This class of materials shows a number of interesting physicochemical properties, namely liquid-crystalline phases (both thermotropic and lyotropic) and strong photoluminescence. The photophysical behavior (fluorescence spectra, fluorescence lifetimes, fluorescence quantum yield) of the complexes differs widely in solid powders, films, and solutions. The amphiphilic cationic surfactants not only play a structural role but also have a strong influence on the photophysical properties of E. The photophysical behavior of E can in this way be easily modified by its organizational motifs.
authors.affiliation: Max Planck Institute of Colloids and Interfaces, Research Campus Golm, 14424 Potsdam-Golm, Germany.
authors.forename: Tierui
authors.initials: T
authors.lastname: Zhang
authors.forename: Christian
authors.initials: C
authors.lastname: Spitz
authors.forename: Markus
authors.initials: M
authors.lastname: Antonietti
authors.forename: Charl F J
authors.initials: CF
authors.lastname: Faul