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Communication Dans Un Congrès Année : 2014

In-depth study of the solid-state crystallization of a luminescent gold-thiolate coordination polymer

C. Lavenn
  • Fonction : Auteur
N. Guillou
  • Fonction : Auteur
G. Ledoux

Résumé

Gold(I) thiolate coordination polymers are an important class of materials [1]. Indeed gold thiolate, (Au-SR)n, have been commercialized in diverse areas as pharmaceuticals or as gilding inks for a long time and today they are essential in nanotechnology for Self-Assembled Monolayers fabrication for electronics or as a key step in nanoparticles synthesis that find application as sensors, biomaterials or in catalysis [2]. Gold(I) atoms are also known to form aurophilic interactions that can induced luminescence. However, despite the importance of (Au-SR)n coordination polymers in those different areas, a little is known about their structure and the relationship with their luminescent properties. Figure 1. On the left, scheme of the thermal induced amorphous-to-crystalline isomerization of (Au-SPh)n at solid-state along with the apparition of luminescent properties. On the right, DSC experiment carried out on the amorphous (Au-SPh)n to characterize the crystallization process. Here we present first, the direct solvothermal synthesis and the structure resolution of a new (Au-SPh)n coordination polymer with thiophenolate. The structure is made of two interpenetrated helices made of infinite –Au-S-Au-S- chains (Figure 1). This gold thiophenolate hybrid material is luminescent at room temperature due to the aurophilic interactions. A two-step synthesis can also be used to obtain this crystalline (Au-SPh)n compound, which is the heating of a preformed amorphous and non-luminescent (Au-SPh)n at solid-state. This amorphous-to-crystalline isomerization is fully characterized by powder X-ray diffraction, thermo-gravimetric analysis, differential scanning calorimetry, scanning electron microscopy and the apparition of the luminescence with the temperature is followed by emission experiments. Different conditions to observe this crystallization, namely heating rate, targeted temperature and isotherms are also discussed. This gold thiophenolate material is the seco nd structure reported for (Au-SR)n coordination polymer and the first example of a thermal induced amorphous-to-crystalline isomerization along with the apparition of light emission.
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Dates et versions

hal-01112155 , version 1 (02-02-2015)

Identifiants

  • HAL Id : hal-01112155 , version 1

Citer

C. Lavenn, N. Guillou, G. Ledoux, Rodica Chiriac, A. Fateeva, et al.. In-depth study of the solid-state crystallization of a luminescent gold-thiolate coordination polymer. GEFTA 40, Sep 2014, Berlin, Germany. ⟨hal-01112155⟩
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