A new mononuclear dysprosium(III)-cucurbituril com-
plex has been synthesized and characterized structurally and magnetically.
It exhibits single-ion magnet (SIM) behavior with two slow magnetic
relaxation processes, which are very sensitive to the solvation degree of
the sample. Depending on the amount and type of the solvent in the
structure, it is possible to switch the slow magnetic relaxation of this
compound between the temperature-independent and temperature-