A pillar[5]arene[1]quinone and a difunctionalizedpillar[6]arene were synthesized. Their application in host–guest chemistry was investigated by using 1-adamantanylammonium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (3), which possesses a weaklycoordinatingcounteranion, as a model guest. These hosts showed different binding affinities for 3 with different association constants.