Measurements on electron-donor–acceptor complex equilibria using fibre-optic photometry

Abstract

The electron-donor–acceptor-complex equilibrium involving 4-methyl-2-nitroaniline (1) and aluminium bromide in diethyl ether has been studied over the temperature range –15°–25 °C using a fibre-optic photometer. The experimental results have been used to calculate the equilibrium constants K_e(T) and the enthalpy of the complex formation ΔH_k. The major design features and advantages of the apparatus used are described and two methods of evaluating the data are compared and discussed.