129Xe and 1H NMR study of the reversible trapping of xenon by cryptophane-A in organic solution

A study was conducted on the interaction of xenon with cryptophane-A in 1,1,2,2-tetrachloroethane-d2 using 129Xe and 1H NMR spectroscopy. The stability of the xenon complex seems to be much greater than that of the previously described xenon complex of alpha-cyclodextrin in water. The findings indicate that the incoming xenon atom must displace the departing one to enter the cryptophane cavity. Moreover, the results suggest that the complexation equilibrium does not involve the empty cryptophane.