Portal de Periódicos da CAPES

Bridging Solution and Solid-State Chemistry of Dicyanoaurate: The Case Study of Zn–Au Nucleation Units

2019; American Chemical Society; Volume: 59; Issue: 1 Linguagem: Inglês

10.1021/acs.inorgchem.9b00961

1520-510X

Emanuele Priola, Giorgio Volpi, Roberto Rabezzana, Elisa Borfecchia, Claudio Garino, Paola Benzi, Andrea Martini, Lorenza Operti, Eliano Diana,

Crystallography and molecular interactions

The behavior in solution of the dicyanoaurate anion in the presence of other metal centers has so far been little explored, despite its importance in material science. The design and synthesis of systems with controlled coordination behavior, using chelating ligands and ZnII, has allowed us to detect self-assembly and oligomerization in solution. This phenomenon has been studied with 13C and 1H NMR, absorption and emission UV–vis spectroscopy, ESI-MS, and XAS at both the Au L3-edge and Zn K-edge: all of these techniques confirm the presence of Au–Zn aggregation products. These fragments, resembling structural units in the solid state, reveal that coordination of dicyanoaurate to free sites around metal centers can occur at a lower concentration than those at which crystals start to form and at which aurophilic interactions are observed, forming the connection between solution species and solid-state architectures.