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Novel paramagnetic clays obtained through intercalation of Gd3+-complexes

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Abstract

Novel paramagnetic lanthanide-exchanged saponite clays, bearing in the interlamellar region positively charged Gd3+-complexes, were synthesized using a hydrothermal approach followed by a classical ion exchange reaction. A detailed characterization was performed to assess the physico-chemical properties of the samples, which showed a hydrodynamic diameter between 50 and 90 nm and good thermal stability. 1H-NMR relaxometric studies in aqueous solution as a function of magnetic field and temperature were carried out to evaluate the local chemical environment of the intercalated paramagnetic centres and their interaction with water molecules. The data indicate a strong interaction of the confined complexes with the lamellae, resulting in a restriction of the local rotational dynamics and of the exchange process of water molecules between the inner coordination sphere of Gd3+ and the bulk. The stability over time in aqueous solutions of varying complexity was also studied by relaxometric techniques.

Graphical abstract: Novel paramagnetic clays obtained through intercalation of Gd3+-complexes

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Publication details

The article was received on 07 Mar 2018, accepted on 22 Apr 2018 and first published on 23 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00875B
Citation: Dalton Trans., 2018, Advance Article
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    Novel paramagnetic clays obtained through intercalation of Gd3+-complexes

    S. Marchesi, F. Carniato, C. Bisio, L. Tei, L. Marchese and M. Botta, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT00875B

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