• DOI:10.1039/c0dt00793e
• Corpus ID: 33247530

Exploration and characterisation of novel bronze patinas derived from simple coordination complexes.

@article{Devantier2011ExplorationAC,
  title={Exploration and characterisation of novel bronze patinas derived from simple coordination complexes.},
  author={Ashley E Devantier and Susan J. Murch and W. Stephen McNeil},
  journal={Dalton transactions},
  year={2011},
  volume={40 3},
  pages={
          614-22
        }
}

• Ashley E Devantier, S. Murch, W. McNeil
• Published 21 January 2011
• Chemistry
• Dalton transactions

The chemical reactions of aqueous solutions containing simple transition-metal salts and bidentate nitrogen ligands on bronze surfaces results in a series of brightly coloured patinas. Chemically and physically robust patinas involve a chemical oxidation of the copper atoms within the bronze surface, either by an applied ferric salt or atmospheric dioxygen. The combination of Fe(NO(3))(3)·9H(2)O and 2,2'-bipyridine produces a coloured patina that is either red or blue, depending on whether oxygen was present during application, due to the presence of [Fe(bpy)(3)](2+) or [Fe(bpy)(3))](3+), respectively. Application of pyrazine produces a bright orange patina, due to the formation of Cu(i) coordination polymers on the bronze surface. Application of Fe(NO(3))(3)·9H(2)O and tetramethylethylenediamine (TMEDA) yields a forest green coloration, believed to be due to a bimetallic copper-iron complex, while TMEDA alone affords the sapphire blue of [Cu(TMEDA)(2)](2+). These patinas were characterized with ESI-TOF MS, UV-Vis spectrophotometry, and IR spectrophotometry, to determine the molecular basis for the patina chromophores.