1977 Volume 50 Issue 12 Pages 3118-3123
The nuclear magnetic multiple-resonance method developed by Forsén and Hoffman for the study of exchange rates has been applied to the two different types of OH protons of the 1,3-dihydroxyacetone dimer in dimethyl-d6 sulfoxide, i.e., OH (α) and CH2OH (β). Here, “decay” and “recovery” curves were obtained using the so-called “INDOR” method, instead of a rapid repetitive scan method. Since the INDOR method continuously monitors a peak height, decay and recovery curves as fast as 1 s can be drawn by storing them in a computer after a single scan. The concentration dependence was examined as a two-site exchange system by neglecting the small amount of water (γ) contained in the dimethyl sulfoxide solvent. Both the lifetime, τ, and the longitudinal relaxation time, T1 obtained from this assumption correlate well with the concentration variation of the 1,3-dihydroxyacetone dimer. The difference in the types of OH protons on the concentration dependence is clearly seen for the latter parameter, T1. From the triple-resonance experiments including γ, it was found that the β proton is more “labile” than the α.
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