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Ether solutions of LiAlH 4  have been investigated by  27 Al and  7 Li magnetic resonance in the concentration range 3.75-0.0075 M. The Al-signal shows a fine structure due to Al-H coupling only at concentrations below 0.15 M. The observed chemical shift  27 Al is only slightly concentration dependent. The line width of the  27 Al signal, which is inversely proportional to T2*, reaches a minimum value at a concentration where the best resolution of the  27 Al quintet is observed. This, however, is not matched by the  7 Li line width whose minimum value was found at a somewhat higher concentration. The results are consistent with multiple ion formation at the higher concentrations and with an ion pair at low concentrations.

Lithium-tetrahydroaluminat in Ether: eine NMR-Untersuchung / Lithiumtetrahydroaluminate in Ether: an NMR Study