Gold nanoparticle dyads stabilized with binuclear Pt(II) dithiol bridges

Ilaria Fratoddi, Iole Venditti, Chiara Battocchio, Giovanni Polzonetti, Federica Bondino, Marco Malvestuto, Emanuela Piscopiello, Leander Tapfer, Maria Vittoria Russo

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The synthesis and characterization of gold nanoparticles (AuNPs-1) stabilized by a novel bifunctional thiolate organometallic complex containing Pt(II) centers, that is, trans,trans-[(CH3COS)(PBu3) 2Pt-C≡C-C6H4-C6H 4-C≡C-Pt(PBu3)2(SCOCH3)] (complex 1), has been carried out. As a comparison, gold nanoparticles stabilized with an organic thiol, allylmercaptane, that is, AuNPs-2, and self-assembled monolayers (SAMs) of both thiols were also prepared and investigated. The AuNPs-1 show a direct link between Pt(II) and Au nanoparticles through a single S bridge and are candidates for the achievement of 2D or 3D networks. The size control of the Au nanoparticles was achieved by careful control of synthesis parameters, and the hybrids were characterized by means of high-resolution transmission electron microscopy (HR-TEM) and synchrotron radiation induced X-ray photoelectron spectroscopy (SR-XPS). SR-XPS measurements allowed the assessment of the anchoring of the organic or organometallic thiols onto gold substrates as well as onto gold nanoparticles. AuNPs-2 with diameters in the range from 1.6 to 3.9 nm were obtained. AuNPs-1 with an average diameter in the range of 4.5-3.6 nm were obtained, and linkage between the nanoparticles can be envisaged with the formation of dyads supported by SR-XPS measurements. In fact, S2p core-level data indicate that both sulfur atoms of the organometallic thiol chemically interact with gold grafting vicinal nanoparticles. © 2011 American Chemical Society.
Original languageEnglish
Pages (from-to)15198 - 15204
Number of pages7
JournalJournal of Physical Chemistry C
Issue number31
Publication statusPublished - 11 Aug 2011
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Fratoddi, I., Venditti, I., Battocchio, C., Polzonetti, G., Bondino, F., Malvestuto, M., ... Russo, M. V. (2011). Gold nanoparticle dyads stabilized with binuclear Pt(II) dithiol bridges. Journal of Physical Chemistry C, 115(31), 15198 - 15204.