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
Abstract
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. Finally, these complexes may account for the atypical luminescence observed in lead-containing cured oil paint films.
- Authors:
-
- Scientific Research Department, Conservation Division, National Gallery of Art, 2000B South Club Drive, Landover, Maryland 20785, United States
- CNRS, University of Bordeaux, ICMCB, 87 Avenue du Docteur A. Schweitzer, UPR 9048, 33608 Pessac Cedex, France
- Publication Date:
- Research Org.:
- National Gallery of Art, Landover, MD (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Gallery of Art (United States)
- Contributing Org.:
- Univ. of Bordeaux (France)
- OSTI Identifier:
- 1321031
- Alternate Identifier(s):
- OSTI ID: 1329023
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Published Article
- Journal Name:
- ACS Omega
- Additional Journal Information:
- Journal Name: ACS Omega Journal Volume: 1 Journal Issue: 3; Journal ID: ISSN 2470-1343
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
MacDonald, Margaret G., Palmer, Michael R., Suchomel, Matthew R., and Berrie, Barbara H. 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. United States: N. p., 2016.
Web. doi:10.1021/acsomega.6b00075.
MacDonald, Margaret G., Palmer, Michael R., Suchomel, Matthew R., & Berrie, Barbara H. 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. United States. https://doi.org/10.1021/acsomega.6b00075
MacDonald, Margaret G., Palmer, Michael R., Suchomel, Matthew R., and Berrie, Barbara H. Wed .
"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". United States. https://doi.org/10.1021/acsomega.6b00075.
@article{osti_1321031,
title = {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},
author = {MacDonald, Margaret G. and Palmer, Michael R. and Suchomel, Matthew R. and Berrie, Barbara H.},
abstractNote = {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. Finally, these complexes may account for the atypical luminescence observed in lead-containing cured oil paint films.},
doi = {10.1021/acsomega.6b00075},
journal = {ACS Omega},
number = 3,
volume = 1,
place = {United States},
year = {Wed Sep 07 00:00:00 EDT 2016},
month = {Wed Sep 07 00:00:00 EDT 2016}
}
https://doi.org/10.1021/acsomega.6b00075
Web of Science
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