An Investigation of AlCl 3 Solutions in Ethers by 27Al NMR Spectroscopy

Abstract

27Al NMR studies of AlCl3 solutions in diethyl ether reveal the presence of aici-4at high concentrations. This ion can also be recognized besides A1C13. • OR2 at low temperature in dilute solutions, while at 25 °C a single signal is observed, which represents the average of all species in solution. More extensive dissociation of AICI3 results in tetrahydrofuran. The main Species in equilibrium with one another are AlCl3-2THF, AlCl-4 and A1Cl2(THF)-2. Nearly quantitative dissociation to yield AlCl4 and [AlClL5]2+ occurs in dilute solutions of AJCI3 in monoglyme (L reprents one oxygen donor atom); at higher concentration an adduct AJC13-L with A1 in a tetrahedral environment is also present. This trend towards extensive dissociation is also observed in the solutions of AICI3 in diglyme and triglyme. Relative peak areas are in agreement with the formation of a 1:1 electrolyte [AlCkL4]+AlCl-4 in diglyme, whereas additional dissociation into [AlClL5]2+ and AICI4 occurs in triglyme. 0340-5087/82/0100-29/$01.00/0. © 1982, Verlag der Zeitschrift für Naturforschung. All rights reserved.