aE (AB), ∆E (BC), and ∆E (ABC) are the interaction energies of A…B, B…C, A…B…C complexes, respectively. ∆E (A-C)far is the interaction energy between two unbonded molecules in the A…B…C ternary system. ∆∆Eis the difference of ∆E in the ternary complex relative to the corresponding binary complex.