In this paper, we review and illustrate applications, reported in the literature or used in our group, of 27Al-27Al double-quantum single-quantum (DQ-SQ) MAS NMR experiments for the structural characterization of Al-containing microporous solids, namely zeolites, aluminophosphates and metal-organic frameworks. Information regarding the periodic frameworks or the localization of the various aluminum species in the materials are obtained from the analysis of the two-dimensional NMR spectra, which allows getting local structural details sometimes inaccessible from other characterization technique. An application of 27Al-27Al of the DQ-SQ experiment for the detection of aluminum pairing in zeolite is shown.

Institut Lavoisier de Versailles CNRS UMR 8180 Université de Versailles Saint Quentin en Yvelines 45 Avenue des Etats Unis Versailles Cedex 78035 France

Institut Lavoisier de Versailles CNRS UMR 8180 Université de Versailles Saint Quentin en Yvelines 45 Avenue des Etats Unis Versailles Cedex 78035 France; CNRS CEMHTI UPR3079 Université d'Orléans Orléans F 45071 France

J Heyrovsky Institute of Physical Chemistry Dolejskova 3 Prague 8 CZ 182 23 Czechia

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