Abstract
A 13 C { 1 H} CPMAS { 27 Al} TRAPDOR NMR experiment is reported with the aim of detecting 13 C− 27 Al proximities and distances in solids. The 13 C and 27 Al pulses are applied to the same probe channel, because their resonance frequencies lie extremely close to each other. The study of the heteronuclear dipolar interaction between these two nuclei, which are of fundamental importance in solid state science, is not possible with standard double resonance approaches. Results are presented for the model compound aluminum lactate. The 13 C signals for the three lactate carbons show different magnitudes of the TRAPDOR effect, in excellent agreement with their mean Al–C distances, calculated from crystal structure data. The results illustrate the feasibility of this method for the study of systems where the interaction of organic and inorganic fractions is directing the structure (template/zeolite) or controlling the catalytic efficiency (organic reactant/catalytically active sites in zeolites or clays).
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