White light emitting silsesquioxane based materials: The importance of a ligand with rigid and directional arms

Andrea Santiago-Portillo, Valerio Cinà, Esther Carbonell, Luca Fusaro, Vincent Lemaur, Roberto Lazzaroni, Michelangelo Gruttadauria, Francesco Giacalone, Carmela Aprile

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

The synthesis of a novel polyhedral oligomeric silsesquioxane functionalized with eight rigid and directional terpyridine-based arms (Ter-POSS) was successfully achieved via a Sonogashira reaction. The POSS based ligand was extensively characterized using different techniques including 1H, 13C and 29Si NMR as well as UV-Vis and fluorescence spectroscopies. The assembly of these nano-caged units in the presence of different transition metal ions (Fe2+, Zn2+ and Cu2+) as well as of a cation from the lanthanides (Eu3+) was investigated using absorption and emission spectroscopies. The final materials display an evident emission in different regions of the visible spectrum as a function of the cation employed. Additional insights into the structural organization of Ter-POSS in the presence of metal cations were obtained via molecular mechanics and molecular dynamics simulations. The polymeric material resulting from the complexation with europium displays a white light emission ascribed to the presence of combined contributions from the blue, green and red regions. The final self-assembled organizations display an increased quantum yield with the highest value (29.6%) obtained in the presence of Zn2+. Moreover, the white-light emitting europium-based nanostructure exhibits one of the highest quantum yields reported in the literature for similar solids.

langue originaleAnglais
Pages (de - à)570-578
Nombre de pages9
journalMaterials Advances
Volume3
Numéro de publication1
Les DOIs
Etat de la publicationPublié - 7 janv. 2022

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