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These nanostructures comprise polyhedral oligomeric silsesquioxanes (POSS) that behave as a nanocage that can be functionalized with terpyridine\u2010based organic ligands, which can be easily complexed with europium (III) ions. The complexes were characterized by UV\u2010Vis and fluorescence spectroscopy and their stoichiometry was also confirmed by <jats:sup>1<\/jats:sup>H NMR spectroscopy. In the presence of the Eu(III) ions, the octafunctionalized nanocages self\u2010assemble to form 3D architectures that display an intense red\u2010emission, 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 <jats:italic>trans<\/jats:italic>\u2010<jats:italic>cis<\/jats:italic> isomerization of the double bond. In the case of the octafunctionalized nanocages (O\u2010POSS), this isomerization was monitored in the presence of Eu(III) cations and was accompanied by an evident colour change from blue (<jats:italic>trans<\/jats:italic>\u2010O\u2010POSS) to red (Eu@<jats:italic>trans<\/jats:italic>\u2010O\u2010POSS) and finally to green (<jats:italic>cis<\/jats:italic>\u2010O\u2010POSS) 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.<\/jats:p>","DOI":"10.1002\/cplu.201900575","type":"journal-article","created":{"date-parts":[[2019,11,17]],"date-time":"2019-11-17T21:59:02Z","timestamp":1574027942000},"page":"391-398","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Tuneable Emission of Polyhedral Oligomeric Silsesquioxane Based Nanostructures that Self\u2010Assemble in the Presence of Europium(III) Ions: Reversible <i>trans<\/i>\u2010to\u2010<i>cis<\/i> Isomerization"],"prefix":"10.1002","volume":"85","author":[{"given":"Valerio","family":"Cin\u00e0","sequence":"first","affiliation":[{"name":"Laboratory of Applied Material Chemistry (CMA) University of Namur  61 rue de Bruxelles 5000 Namur Belgium"},{"name":"Department of 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