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Solid-State NMR Studies Of Ultramarine Pigments Discoloration

Published online by Cambridge University Press:  26 February 2011

Eleonora Del Federico ,
Jacob Newman ,
Lindsey Tyne ,
Cyndi O'Hern ,
Licio Isolani  and
Alexej Jerschow
Eleonora Del Federico
Affiliation:
[email protected] Pratt Institute Department of Mathematics and Science 200 Willoughby Ave Brooklyn NY 11205 United States 718-636-3764
Jacob Newman
Affiliation:
[email protected] New York University Chemistry Department 100 Washington Square East New York NY 10003 United States
Lindsey Tyne
Affiliation:
[email protected] Pratt Institute Department of Mathematics and Science 200 Willoughby Ave Brooklyn NY 11205 United States
Cyndi O'Hern
Affiliation:
[email protected] Pratt Institute Department of Mathematics and Science 200 Willoughby Ave Brooklyn NY 11205 United States
Licio Isolani
Affiliation:
[email protected] Pratt Institute Fine Arts Department 200 Willoughby Ave Brooklyn NY 11205 United States
Alexej Jerschow
Affiliation:
[email protected] New York University Chemistry Department 100 Washington Square East New York NY 10003 United States
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Abstract

Ultramarines are a family of pigments widely used as colorants in artists' paints, coatings, plastics, cosmetics, and various industrial materials. They are aluminosilicates characterized by a sodalite cage framework which enclarthrates paramagnetic (S3 -., S2 -.) and diamagnetic (S4 or S3Cl) chromophores responsible for the color of these pigments. Solid-state 27Al MAS NMR studies showed that the fading mechanisms in ultramarine pigments, both in acidic and alkaline environments, is initiated via de-alumination leading to framework destruction which in turn triggers the release of the chromophores. This results in color loss and in the emergence of extra-framework aluminum. 29Si MAS studies provide new insight into these processes and suggest that acidic attack leads to the formation of Q1-Q3 silicates and possibly to the emergence of Si(3Al), Si(2Al), Si(1Al) and Si(0Al) fragments indicative of the formation of secondary pores through which the guest chomophores can leave the cage. These findings are important for the design of proper conservation treatments and preservation procedures for artwork containing ultramarine pigments.

Keywords

archaeologyzeolitenuclear magnetic resonance (NMR)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 984: Symposium MM – Magnetic Resonance in Material Science , 2006 , 0984-MM07-13
Copyright
Copyright © Materials Research Society 2007

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