The 13C NMR spin−lattice relaxation time
(T
1) and
13C{H} NOE of the individual carbon
atoms of each
2-ethylhexyl chain in an aerosol OT (AOT) molecule have been
investigated in the reversed micellar state,
and the segmental mobility of each 2-ethylhexyl chain has been
discussed independently in connection with
the chirality effect on the 13C chemical shifts.
Measurements of the NOESY and ROESY spectra of an AOT
molecule and cross-peak assignments have been made. In particular,
for the ROESY spectrum, the cross-peaks arising from the dipole−dipole interaction have been used to
discuss successfully the spatial proximity
of the two 2-ethylhexyl chains. It has also been found that the
carbon atom having the larger 1/
values
provides larger secondary splitting of the 13C chemical
shift. Furthermore, the dipole−dipole interaction
between the H3 or H3‘ protons and other specific protons has been found
to be strongly dependent on the
diastereoisomers. Selective NOE measurements were also made, and
the proximity of intermolecular or
intramolecular two 2−ethylhexyl chains has been
discussed.
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