Aluminium-27 nuclear magnetic resonance studies of the hydrolysis of aluminium(III). Part 2. Gel-permeation chromatography

Abstract

The gel-permeation chromatography of two different type of hydrolysed aluminium(III) solution are described, the separations being monitored by conductivity, pH, pCl, and ²⁷Al n.m.r. measurements. Solutions hydrolysed by dissolution of aluminium metal in AlCl₃ solution contain at least four components including [Al(OH₂)₆]³⁺ and [AlO₄Al₁₂(OH)₂₄(OH₂)₁₂]⁷⁺ whereas hydrolysis with Na₂[CO₃] produces only a high-molecular-weight polymeric ionic material and the Al₁₃⁷⁺ cation. A fraction was obtained which contained only the latter ion and was more stable than the original solution.