Abstract
Abstract The effect of chemical exchange on the longitudinal magnetization recovery (LMR) was investigated by means of the 27Al NMR in aqueous Al2(SO4)3 solution. It was elucidated for the first time that in the case of the rapid ligand-exchange between [A1(H2O)5SO4]+(A) and [Al(H2O)6]3+(B) the slope of a single exponential decay in the observed LMR gives a slow rate R1,B(<R1,A) of the time evolution of the longitudinal magnetization under the presence of energy relaxation as well as chemical exchange. The value of R1,B at the rapid exchange limit becomes equal to fAR1,A*+fBR1,B* as reported so far, where R1,α* is energy relaxation rate at site α.
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