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Title

Tuneable Emission of Polyhedral Oligomeric Silsesquioxane Based Nanostructures that Self-Assemble in the Presence of Europium(III) Ions: Reversible trans-to-cis Isomerization

AuthorsCinà, V.; Carbonell, Esther; Fusaro, L.; García Gómez, Hermenegildo; Gruttadauria, M.; Giacalone, F.; Aprile, C.
Issue Date17-Nov-2019
PublisherWiley-VCH
CitationChemPlusChem 85(3): 391-398 (2019)
AbstractHybrid nanostructures with switchable and reversible “blue-red-green” emission were efficiently synthesized. These nanostructures comprise polyhedral oligomeric silsesquioxanes (POSS) that behave as a nanocage that can be functionalized with terpyridine-based organic ligands, which can be easily complexed with europium (III) ions. The complexes were characterized by UV-Vis and fluorescence spectroscopy and their stoichiometry was also confirmed by H NMR spectroscopy. In the presence of the Eu(III) ions, the octafunctionalized nanocages self-assemble to form 3D architectures that display an intense red-emission, especially in the solid state. The presence of an alkenyl group bridging the inorganic core to the organic moiety was employed to tune the emission properties by trans-cis isomerization of the double bond. In the case of the octafunctionalized nanocages (O-POSS), this isomerization was monitored in the presence of Eu(III) cations and was accompanied by an evident colour change from blue (trans-O-POSS) to red (Eu@trans-O-POSS) and finally to green (cis-O-POSS) as consequence of the release of the metal cations. This behaviour, together with the easy dispersion of the dry powder and the possibility of coating as a film in presence of small amounts of solvent, makes the emissive solid promising for applications in materials science.
Publisher version (URL)http://dx.doi.org/10.1002/cplu.201900575
URIhttp://hdl.handle.net/10261/207838
Identifiersdoi: 10.1002/cplu.201900575
issn: 2192-6506
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