13C and 15N Cross-Polarization Magic Angle Spinning NMR Spectra of 15N-Enriched 2-Phenethylamine Adsorbed on an Activated Clay

The cross-polarization magic angle spinning (CPMAS) NMR spectra of I5N-enriched 2-phenethylamine as the ammonium salt and adsorbed on an aluminum-exchanged clay are compared with spectra for natural abundance 2-phenethylamine. An important gain in resolution is observed in the /3 carbon chemical shift region of the CPMAS of the 15N-enriched material relative to either the natural abundance material or the W-enriched amine. The CPMAS l5N NMR spectra of '5N-enriched 2-phenethylamine adsorbed on the aluminum-exchanged clay reveal the presence of multiple Bronsted sites for adsorption.