Abstract: The syntheses and free energies of association of 12 new macrocyclic ligand systems (hosts) with alkali metal and ammonium and alkylammonium picrates in CDCI3 are reported at 25" C. Ten of the hosts were composed of 4-methylanisole units (abbreviated AN) incorporated into the macroring by substitution at their 2, 6 positions by CH20 (MO) units, or by direct attachment to other AN units at their 2, 6 positions. The macrorings were ...