Rotational-echo double-resonance (REDOR) 13 C{ 19 F} and 15 N{ 19 F} NMR spectra have been obtained for guest−host complexes of 6-fluorotryptophan and 4-(trifluoromethyl)benzophenone with polymeric amphiphilic nanoparticles, consisting of a polystyrene core covalently attached to a poly(acrylic acid)- co -[ 15 N]polyacrylamide shell. The REDOR spectra were used both to determine the composition of the nanoparticles and to find the locations of the fluorinated guests. Each guest resides near the core−shell interface of the nanoparticle, with the hydrophobic 4 - (trifluoromethyl)benzophenone within the core and the amphiphilic 6-fluorotryptophan within the shell.
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Huang et al. (2001) studied this question.