EPR and NMR investigation on the interactions of nitroxide probes with resorcin[4]arene molecular capsules.
EPR experiments in water-saturated CH(2)Cl(2) solution clearly indicate that oxotempo is not included inside hexameric molecular capsules of resorcin[4]arene. In fact, the tumbling rate of oxotempo only experiences minor changes when resorcinarene is present in the solution. However, NMR spectroscopic data suggest that oxotempo engages in labile hydrogen-bonding interactions with water molecules interacting with the resorcinarene molecular capsules.
Yi
Song
S
Center for Supramolecular Science and Department of Chemistry, University of Miami, Coral Gables, Florida 33124-0431, USA.
Mileo
Elisabetta
E
Kaifer
Angel E
AE