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Lapadula, Giuseppe; Trummer, David; Conley, Matthew P; Steinmann, Martin; Ran, Ying-Fen; Brasselet, Sophie; Guyot, Yannick; Maury, Olivier; Decurtins, Silvio; Liu, Shi-Xia; Copéret, Christophe
Chemistry of materials, 03/2015, Letnik: 27, Številka: 6Journal Article
Silica nanoparticles of 12 nm diameter were surface-doped with ca. 350 (TTF-dppz)Yb(III) surface species, containing bis(propylthio)tetrathiafulvenylidipyrido-3,2-a:2′,3-cphenazine (TTF-dppz) as an antenna ligand through a surface organometallic chemistry approach. These nanoparticles absorb and emit in the NIR (λabs = 750 nm, λem = 983 and 1050 nm) with a lifetime (τ1) of 2.8 μs, similarly to the corresponding Yb(III) molecular complex (λabs = 750 nm, λem = 975, 986, 1009, and 1020 nm with τ1 = 6.93 μs). The silica materials were fully characterized using combined spectroscopic techniques (IR, NMR, UV–vis, luminescence and lifetime), molecular models and isostructural diamagnetic yttrium-containing materials for easier characterization by NMR spectroscopy. Having established the surface structures and photophysical properties of these nanoparticles, we transposed this methodology to larger silica particles with a diameter of ca. 100 nm. These larger nanoparticles have similar photophysical properties and contain ca. 30 000 chromophores, making possible one-photon NIR-to-NIR emission optical microscopy imaging of single nanoparticles.
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