Host-guest supramolecular chemistry. 34. The incremental approach to noncovalent interactions: coulomb and van der Waals effects in organic ion pairs

摘要: The equilibria of 10 ion pairs with aromatic units in one or both ions are determined water by UV/vis and partially NMR conductivity experiments, showing most cases satisfactory agreement. measurements at different wavelengths usually exhibit weaker 1:2, addition to 1:1, complexes. On the basis a generalized principle additive binding increments, results from about 40 pairs-many literature-show surprisingly constant Coulomb increment ΔG=5±1 kJ/mol per single salt bridge