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(top) 27Al heteronuclear Overhauser effect spectroscopy (HOESY) spectrum of Al2(SO4)3 recorded in L1 solution at pH 3 with 30 ms mixing time (left) with the region characteristic for hexa-coordinated aluminium (magnified, right); (bottom) 27Al exchange spectroscopy (EXSY) spectra recorded with 0 ms mixing time (left) as a reference spectrum and 10 ms mixing time (right).
