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Insertion of indigo molecules in the sepiolite structure as evidenced by H-1-Si-29 heteronuclear correlation spectroscopy

Abstract : Despite the numerous studies of the famous indigo-based pigment Maya Blue, there are still many questions regarding the elucidation of its structure. Here, two-dimensional (2D) H-1-Si-29 heteronuclear correlation (HETCOR) spectroscopy with frequency-switched Lee-Goldburg (FSLG) homonuclear decoupling is applied to sepiolite and sepiolite-indigo complexes. Owing to the high resolution in the H-1 dimension of the 2D H-1-Si-29 HETCOR spectrum obtained by FSLG homonuclear decoupling, the assignment of the Si-29 cross-polarization magic-angle spinning (CPMAS) spectrum of sepiolite is clearly confirmed. Moreover, 2D H-1-Si-29 FSLG-HETCOR spectroscopy gives the first direct evidence that some indigo molecules are inserted in the sepiolite structure whereas no interaction between indigo and the external side surface (silanol groups) is observed in the Si-29 CPMAS spectra. These results are consistent with the fact that indigo molecules interact with water coordinated to magnesium and suggest that Maya Blue made from sepiolite is not a surface complex.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00570521
Contributeur : Magalie Prudon <>
Soumis le : lundi 28 février 2011 - 15:44:08
Dernière modification le : lundi 12 octobre 2020 - 10:28:08

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Jesus Raya, Jerôme Hirschinger, Sonia Ovarlez, Francoise Giulieri, Anne-Marie Chaze, et al.. Insertion of indigo molecules in the sepiolite structure as evidenced by H-1-Si-29 heteronuclear correlation spectroscopy. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2010, 12 (43), pp.Pages 14508-14514. ⟨10.1039/C0CP00834F⟩. ⟨hal-00570521⟩

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