Understanding soap formation in paint films by 207Pb, 119Sn and 13C solid-state NMR

Jaclyn Catalano; Yao Yao; Anna Murphy; Nicholas Zumbulyadis; Silvia A. Centeno; Cecil Dybowski

Understanding soap formation in paint films by ²⁰⁷Pb, ¹¹⁹Sn and ¹³C solid-state NMR

Jaclyn Catalano, Yao Yao, Anna Murphy, Nicholas Zumbulyadis, Silvia A. Centeno, Cecil Dybowski

Chemistry and Biochemistry

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Scopus citations

Abstract

The formation of lead carboxylates (lead soaps) has been identified as the cause of deterioration of hundreds of oil paintings. Soaps form when heavy metal-containing pigments, for example lead white and lead-tin yellow, react with saturated fatty acids in the oil medium. Understanding the mechanism of the reactions requires chemical information, which can be obtained with solid-state ²⁰⁷Pb, ¹¹⁹Sn and ¹³C NMR spectroscopy. Using the chemical-shift tensors determined by solid-state NMR we can gain structural insights on the coordination environment of the lead carboxylates and identify and quantify components in a paint film mixture. We have examined the spectroscopy of lead-containing pigments, lead carboxylates, and model paint films that were subjected to accelerated aging. We have also begun to investigate the dynamics of soap formation by ¹³C NMR spectroscopy. The NMR methods applied to the model paint systems could also be applied to other lead-containing materials.

Original language	English
Title of host publication	Materials Science and Technology Conference and Exhibition 2014, MS and T 2014
Publisher	Association for Iron and Steel Technology, AISTECH
Pages	2161-2168
Number of pages	8
ISBN (Electronic)	9781634397230
State	Published - 2014
Event	Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 - Pittsburgh, United States Duration: 12 Oct 2014 → 16 Oct 2014

Publication series

Name	Materials Science and Technology Conference and Exhibition 2014, MS and T 2014
Volume	3

Other

Other	Materials Science and Technology Conference and Exhibition 2014, MS and T 2014
Country/Territory	United States
City	Pittsburgh
Period	12/10/14 → 16/10/14

Keywords

Lead NMR
Lead carboxylases
Lead pigments
Paint films
Solid-state NMR
Tin NMR

Cite this

Catalano, J., Yao, Y., Murphy, A., Zumbulyadis, N., Centeno, S. A., & Dybowski, C. (2014). Understanding soap formation in paint films by ²⁰⁷Pb, ¹¹⁹Sn and ¹³C solid-state NMR. In Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 (pp. 2161-2168). (Materials Science and Technology Conference and Exhibition 2014, MS and T 2014; Vol. 3). Association for Iron and Steel Technology, AISTECH.

Catalano, Jaclyn ; Yao, Yao ; Murphy, Anna et al. / Understanding soap formation in paint films by ²⁰⁷Pb, ¹¹⁹Sn and ¹³C solid-state NMR. Materials Science and Technology Conference and Exhibition 2014, MS and T 2014. Association for Iron and Steel Technology, AISTECH, 2014. pp. 2161-2168 (Materials Science and Technology Conference and Exhibition 2014, MS and T 2014).

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title = "Understanding soap formation in paint films by 207Pb, 119Sn and 13C solid-state NMR",

abstract = "The formation of lead carboxylates (lead soaps) has been identified as the cause of deterioration of hundreds of oil paintings. Soaps form when heavy metal-containing pigments, for example lead white and lead-tin yellow, react with saturated fatty acids in the oil medium. Understanding the mechanism of the reactions requires chemical information, which can be obtained with solid-state 207Pb, 119Sn and 13C NMR spectroscopy. Using the chemical-shift tensors determined by solid-state NMR we can gain structural insights on the coordination environment of the lead carboxylates and identify and quantify components in a paint film mixture. We have examined the spectroscopy of lead-containing pigments, lead carboxylates, and model paint films that were subjected to accelerated aging. We have also begun to investigate the dynamics of soap formation by 13C NMR spectroscopy. The NMR methods applied to the model paint systems could also be applied to other lead-containing materials.",

keywords = "Lead NMR, Lead carboxylases, Lead pigments, Paint films, Solid-state NMR, Tin NMR",

author = "Jaclyn Catalano and Yao Yao and Anna Murphy and Nicholas Zumbulyadis and Centeno, {Silvia A.} and Cecil Dybowski",

note = "Publisher Copyright: Copyright {\textcopyright} 2014 MS&T14{\textregistered}.; Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 ; Conference date: 12-10-2014 Through 16-10-2014",

year = "2014",

language = "English",

series = "Materials Science and Technology Conference and Exhibition 2014, MS and T 2014",

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Catalano, J, Yao, Y, Murphy, A, Zumbulyadis, N, Centeno, SA & Dybowski, C 2014, Understanding soap formation in paint films by ²⁰⁷Pb, ¹¹⁹Sn and ¹³C solid-state NMR. in Materials Science and Technology Conference and Exhibition 2014, MS and T 2014. Materials Science and Technology Conference and Exhibition 2014, MS and T 2014, vol. 3, Association for Iron and Steel Technology, AISTECH, pp. 2161-2168, Materials Science and Technology Conference and Exhibition 2014, MS and T 2014, Pittsburgh, United States, 12/10/14.

Understanding soap formation in paint films by ²⁰⁷Pb, ¹¹⁹Sn and ¹³C solid-state NMR. / Catalano, Jaclyn; Yao, Yao; Murphy, Anna et al.
Materials Science and Technology Conference and Exhibition 2014, MS and T 2014. Association for Iron and Steel Technology, AISTECH, 2014. p. 2161-2168 (Materials Science and Technology Conference and Exhibition 2014, MS and T 2014; Vol. 3).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Catalano, Jaclyn

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AU - Murphy, Anna

AU - Zumbulyadis, Nicholas

AU - Centeno, Silvia A.

AU - Dybowski, Cecil

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AB - The formation of lead carboxylates (lead soaps) has been identified as the cause of deterioration of hundreds of oil paintings. Soaps form when heavy metal-containing pigments, for example lead white and lead-tin yellow, react with saturated fatty acids in the oil medium. Understanding the mechanism of the reactions requires chemical information, which can be obtained with solid-state 207Pb, 119Sn and 13C NMR spectroscopy. Using the chemical-shift tensors determined by solid-state NMR we can gain structural insights on the coordination environment of the lead carboxylates and identify and quantify components in a paint film mixture. We have examined the spectroscopy of lead-containing pigments, lead carboxylates, and model paint films that were subjected to accelerated aging. We have also begun to investigate the dynamics of soap formation by 13C NMR spectroscopy. The NMR methods applied to the model paint systems could also be applied to other lead-containing materials.

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Catalano J, Yao Y, Murphy A, Zumbulyadis N, Centeno SA, Dybowski C. Understanding soap formation in paint films by ²⁰⁷Pb, ¹¹⁹Sn and ¹³C solid-state NMR. In Materials Science and Technology Conference and Exhibition 2014, MS and T 2014. Association for Iron and Steel Technology, AISTECH. 2014. p. 2161-2168. (Materials Science and Technology Conference and Exhibition 2014, MS and T 2014).