Abstract
Multinuclear (27A1, 19F, 13C, and 1H) NMR measurements at room temperature of aqueous solutions containing 2 M Al(NO3)3, 2.1 M morpholine, in the presence and absence of 1 M HF, suggest that morpholine is a chemically inactive specie. The proton and carbon chemical shifts of morpholine in the two solutions reveal the same pH dependence, suggesting that morpholine can be used as a probe molecule for pH determination. Moreover, the broad peaks observed in the 19F and 27A1 NMR spectra are consistent with the formation of multinuclear Al species and Al−F complexes. The observed changes in peak intensities of these same nuclei as a function of pH are in semiquantitative agreement with corresponding intensities calculated from chemical equilibrium reaction models. A more detailed spectral analysis reveals some discrepancies between observed and calculated intensities and is discussed in the text.
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