The rotational spectra have been assigned for six isotopologues of the CH 2 ClF⋯Xe, arising from some combinations of the 35 Cl, 37 Cl, 129 Xe, 131 Xe, 132 Xe and 134 Xe isotopes of Cl and Xe. The xenon atom is located out of the ClCF plane, interacting with both F and Cl atoms. All rotational transitions are split in several component lines, due to the 35 Cl or 37 Cl (or 131 Xe) quadrupole components, and to the tunneling motion of the Xe atom between two equivalent positions, below and above the ClCF plane. The barrier between these two equivalent conformations is ca. 76cm −1 .