diatomic molecule (whether homonuclear
or heteronuclear) always changes
Johnson Jr, "Three-dimensional diffusion-ordered NMR spectroscopy: the homonuclear
COSY-DOSY experiment," Journal of Magnetic Resonance, Series A, vol.
The excitation of atoms of some diatomic molecules especially the homonuclear
diatomic molecules is the principle used in spectrophotometric technique.
Furthermore, this technique can provide 2D homonuclear
[sup.13]C-[sup.13]C correlation solid-state NMR spectra at natural isotopic abundance, yielding, and an atomic level structural investigation [75, 76].
500 ppm) , which helps to avoid signal overlap and shows less interference from homonuclear
coupling [11-13] and more importantly the solvent (mostly containing no fluorine) has no effect on the [sup.19]F NMR signal and as such solvent suppression is not necessary.
TABLE 1: [sup.1]H (300.13 MHz) and [sup.13]C (75.47 MHz) NMR spectral data for compound 2 in CD[Cl.sub.3], including results obtained by homonuclear
2D shift-correlated and heteronuclear 2D shift- correlated HSQC ([sup.1][J.sub.CH]).
Additional 2-dimensional NMR experiments were performed for the purpose of confirming chemical shift assignments, including homonuclear
total correlation spectroscopy (2D [sup.1]H-[sup.1]H TOCSY) and hetero-nuclear single quantum coherence spectroscopy (2D [sup.1]H-[sup.13]C HSQC) acquired by Bruker's standard pulse sequences mlevphpr and hsqcphpr.
Peterson, "Active Thermochemical Tables: dissociation energies of several homonuclear
firstrow diatomics and related thermochemical values," Theor.
Parella, "Spin-edited 2D HSQC-TOCSY experiments for the measurement of homonuclear
and heteronuclear coupling constants: application to carbohydrates and peptides," Journal of Magnetic Resonance, vol.
(COSY) and heteronuclear (HSQC, HMBC) correlations enabled the assignment of the entire set of [sup.1]H and [sup.13]C resonances and identifying the five new furostanol saponin derivatives (1a/b-5).
For proton 2-D, COSY and homonuclear
j-resolved spectroscopy are offered along with [T.sub.1] and [T.sub.2] relaxation experiments.