Mobility of configuration and conformation in the “push−pull” cross-conjugated derivative 1,3-diphenyl-2-(p-dimethylaminophenyl)iminopropane-1,3-dione has been investigated by NMR. The energetics of the thermal process that interconnects the syn- and anti-configurations of the
imino group with the atropisomeric conformations of the skewed benzoyl groups are defined. It is proposed that a symmetric Y-delocalized
transition state thermally interconnects the inversion of the imino configurations with the mobile interchange of the skewed benzoyl conformations.
This connection is observable through a unique NMR window.
An apodization function, the sinc-TRAF function (S-TRAF), has been developed for application to exponentially decaying data sets where the acquisition times ( AT) is less than or equal to one time constant, T2. For heavily truncated time-domain signals, S-TRAF is able to remove sinc ripple with only minor losses in linewidth (LW) and signal-to-noise ratio (S/N). Ripple removal achieved with the application of S-TRAF rivals that observed from use of the “ultimate ripple-free resolution enhancement” function (URFRE) for AT as low as 0.3 T2*. S-TRAF maintains LW and S/N better than URFRE for all acquisition times examined.
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