6.16 CPNOESYPS—Cross-Polarization Phase-Sensitive NOESY
01-999162-00 C0402 VNMR 6.1C User Guide: Solid-State NMR
104
Parameters
cpcosyps uses
UNITY
INOVA and UNITYplus parameters tpwr, tpwrm, dpwr, cppwr,
dipolr, crossp, dblvl2, pw, and cntct. See page 85 for a description of these
parameters.
xpol is set to 'n' for preparation by direct polarization; xpol is set to 'y' for
preparation by cross-polarization.
pw is the observe 90
° pulse (xpol='n') or the proton 90° pulse (xpol ='y'). pw is in
microseconds.
pwx is the mixing pulse, in microseconds. If xpol='n', pwx=pw; if xpol='y', it is set
to the observe 90
° pulse.
srate is the measured MAS spinning speed. CPCOSYPS does not require rotor speed
control. However, with rotor speed control, set sw1 equal to srate to remove spinning
sidebands in both dimensions.
phase=1,2 for the hypercomplex method (use wft2da for the 2D FT); phase=3 for
TPPI (use wft2d(1,0,0,0) for the 2D FT).
Reference
Wu, G.; Wasylishen, R. E. Organometallics 1992, 11, 3242.
6.16 CPNOESYPS—Cross-Polarization Phase-Sensitive
NOESY
The CPNOESYPS sequence is a 3-pulse 2D exchange correlation sequence similar to the
high-resolution NOESY experiment. CPNOESYPS can be run as a direct polarization
experiment or the first 90
° pulse can be substituted with a cross-polarization pulse element.
Figure 45 is a diagram of this sequence.
Figure 44. CPCOSYPS Pulse Sequence
pw
cntct
cntct
(tpwrm)
(crossp)
(dipolr)
Tx
Dec
at
d1
AC
pwx
d2
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