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Mazzaro R.,University of Bologna | Mazzaro R.,CNR Institute of Neuroscience | Locritani M.,University of Bologna | Molloy J.K.,University of Bologna | And 7 more authors.
Chemistry of Materials | Year: 2015

Two families of strongly luminescent silicon nanocrystals (SiNCs) cofunctionalized with dodecyl chains and pyrene chromophores perform as light-harvesting antennae and interact with carbon allotropes. The energy harvested in the SiNC core can thus be used to populate, for example, the lowest triplet excited state of C60. © 2015 American Chemical Society.

Fermi A.,University of Bologna | Locritani M.,University of Bologna | Di Carlo G.,University of Milan | Pizzotti M.,University of Milan | And 7 more authors.
Faraday Discussions | Year: 2015

Silicon nanocrystals functionalized with tetraphenylporphyrin Zn(ii) chromophores at the periphery perform as light harvesting antennae: excitation of the porphyrin units in the visible spectral region yields sensitized emission of the silicon nanocrystal core in the near infrared with a long lifetime (λmax = 905 nm, τ = 130 μs). This result demonstrates that this hybrid material has a potential application as a luminescent probe for bioimaging. © 2015 The Royal Society of Chemistry.

Giannetto A.,Messina University | Puntoriero F.,Messina University | Puntoriero F.,Centro Interuniversitario per la Conversione Chimica dellEnergia Solare Chemical | Notti A.,Messina University | And 9 more authors.
European Journal of Inorganic Chemistry | Year: 2015

New compounds Ia-h of the form [(Me2SO)ClPt(HR2DTO κ-S,S Pt)] (HR2DTO = secondary dithiooxamide, with R = methyl, ethyl, n-propyl, n-butyl, n-decyl, isopropyl, (R)-1-phenylethyl, or (S)-2-hydroxypropyl; κ-S,S Pt denotes the coordination of the DTO moiety to the Pt atom) have been prepared and used to synthesize platinum(II)/ferrocene dimetallic species IIa-h of formula [(dppf)Pt(HR2DTO κ-S,S Pt)]Cl (dppf = 1,1'-diphosphinoferrocene). Complexes IIa-e, bearing unbranched groups on the dithiooxamide moiety (i.e., R = methyl, ethyl, n-propyl, n-butyl, or n-decyl groups), self-assemble upon standing to form unprecedented hexameric macrocycles IIIa-e. Compounds IIa-e, IIIa-e, as well as IIf-h, have been characterized by a combination of 1H, 13C, 31P NMR spectroscopy and 2D-ROESY and diffusion-ordered NMR spectroscopy (DOSY) experiments; the latter experiments have been used to calculate the hydrodynamic radius of IIa-e and IIIa-e, assisted by the data provided by the X-ray crystal structure of IIh. Compounds IIIa-e are characterized by the presence of six dppf bridging units occupying the inner rim of the macrocycles and exhibit interesting properties, for example, oxidation of IIIa-e occurs around +0.40 V versus saturated calomel electrode (SCE), whereas oxidation of the type II species occurs at potentials greater than +1.0 V. Oxidation of IIIa-e is explained through a delocalized orbital extending over the six dppf subunits. The reversibility of the self-assembly process is finally demonstrated by alternate addition of acids and bases to the type III compounds. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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