Abstract
27Al NMR spectroscopy is a powerful tool for the study of coordination and solvation in both aqueous and nonaqueous solutions. In this study, the complexes coexisting upon dissolution of AlCl3 in acidic acetone + methanol solutions are shown to consist essentially of mixed hexacoordinated species of the general formula [Al(CH3OH)6−n (CH3COCH3) n ]3+ (n=1,2 and 3), all exhibiting distinctly different 27Al shielding effects. The relative populations of the various mixed species are found to be highly dependent upon the acetone:methanol mole ratio that in the more acetone-rich mixtures with aluminum become appreciably coordinated by acetone. The results demonstrate that the key factor for the formation of acetone-containing species in acidic methanolic solutions is having the CH3COCH3:CH3OH mole ratio at 3:1.
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Samadi-Maybodi, A., Pourali, S.M. & Tafazzoli, M. Aluminum Solvate Complexes Forming in Acidic Methanol-Acetone Mixtures Studied by 27Al NMR Spectroscopy. J Solution Chem 38, 159–169 (2009). https://doi.org/10.1007/s10953-008-9364-1
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DOI: https://doi.org/10.1007/s10953-008-9364-1