An investigation of the kinetic and thermodynamic stability of a tribenzomacrobicyclic polyether complex with Diquat in acetone solution

Abstract

Variable-temperature ¹H n.m.r. spectroscopic studies in CD₃COCD₃ and u.v. spectroscopic measurements in Me₂CO demonstrate that in the 1 : 1 complex, [Diquat·(1)]²⁺, the quest is encapsulated within the host and that the complexation strength (ΔG°=–7.4 Kcal mol^–1) is enhanced by the macrobicyclic cryptate effect.