Thermodynamics of complexation of aqueous 18-crown-6 with potassium ion: apparent molar volumes and apparent molar heat capacities of aqueous 18-crown-6 and of the (18-crown-6 + potassium chloride) complex at temperatures (278.15 to 393.15) K, at molalities (0.02 to 0.3) mol·kg−1, and at the pressure 0.35 MPa Niederhauser, T.; Brown, B.; Ziemer, S.; Sargent, J.; Woolley, E.; The Journal of Chemical Thermodynamics 2004, 36, 1067-1077