Hetero dimer from tetrakisammonium cavitand and tetratopic crown ether cavitand

Hetero dimer 6 [ PF 6 - ] 4 between tetrakis(m-ammonium)cavitand 2 [ PF 6 - ] 4 and tetrakis(dibenzo-25-crown-8)cavitand 5 was formed in CDCl3 at room temperature. The effects of solvent polarity and temperature on the stability of 6 [ PF 6 - ] 4 were studied and the thermodynamic parameters for the formation of 6 [ PF 6 - ] 4 are Δ G 303 K 0 = - 6.6 kcal mol - 1 , ΔH0 = −67.4 kcal mol−1 and ΔS0 = −201.6 cal mol−1 K−1.