Reaction of Pb(II) and Zn(II) with Ethyl Linoleate To Form Structured Hybrid Inorganic–Organic Complexes: A Model for Degradation in Historic Paint Films
| Autor: | Barbara H. Berrie, Michael Palmer, Matthew R. Suchomel, Margaret G. MacDonald |
|---|---|
| Přispěvatelé: | Scientific Research Department, National Gallery of Art, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Charles E. Culpeper Fellowship at the National Gallery of Art, Washington, DC, Use of the APS at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
General Chemical Engineering Metal ions in aqueous solution Analytical chemistry 02 engineering and technology 01 natural sciences Article Absorbance Metal lcsh:Chemistry chemistry.chemical_compound [CHIM.COOR]Chemical Sciences/Coordination chemistry Carboxylate Fourier transform infrared spectroscopy 010401 analytical chemistry General Chemistry [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Oil paint chemistry lcsh:QD1-999 visual_art visual_art.visual_art_medium Crystallite 0210 nano-technology Powder diffraction Nuclear chemistry |
| Zdroj: | ACS Omega ACS Omega, ACS Publications, 2016, 1 (3), pp.344-350. ⟨10.1021/acsomega.6b00075⟩ ACS Omega, Vol 1, Iss 3, Pp 344-350 (2016) |
| ISSN: | 2470-1343 |
| DOI: | 10.1021/acsomega.6b00075⟩ |
| Popis: | International audience; To investigate soap formation in drying oils in historic paints, the reaction between metal acetates (K+, Zn2+, Pb2+) and ethyl linoleate (EL) was studied using optical microscopy, X-ray powder diffraction, and electron microscopy. Pb(II) and Zn(II) react rapidly with EL to form highly structured, spherulitic, luminescent crystallites that aggregate. Evidence from Fourier transform infrared (FTIR) and scanning electron microscopy/energy dispersive X-ray analysis and high-resolution synchrotron powder X-ray diffraction indicates that these are organic–inorganic hybrid complexes or coordination polymers. FTIR absorbance peaks at ca. 1540 cm–1 for Pb(II) and ca. 1580 cm–1 for Zn(II) are consistent with the formation of carboxylate complexes. The complexes formed offer insight into the degradation processes observed in oil paint films, suggesting that soap formation is rapid when metal ions are solubilized and can occur with unsaturated fatty acids that are present in fresh oils. These complexes may account for the atypical luminescence observed in lead-containing cured oil paint films. |
| Databáze: | OpenAIRE |
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