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Issue 3, 2011

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

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Abstract

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(NO3)3·9H2O 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(NO3)3·9H2O 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.

Graphical abstract: Exploration and characterisation of novel bronze patinas derived from simple coordination complexes

Supplementary files

Article information


Submitted
06 Jul 2010
Accepted
13 Oct 2010
First published
01 Dec 2010

Dalton Trans., 2011,40, 614-622
Article type
Paper

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

A. E. Devantier, S. J. Murch and W. S. McNeil, Dalton Trans., 2011, 40, 614 DOI: 10.1039/C0DT00793E

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