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Chemical exchange frequency shifts

Calculation of DNMR spectra is based on the construction of operators of interactions of the system and solving their eigenvalue problem. The most complicated interactions are the perturbation effects of the chemical shielding and the scalar coupling on the resonance frequency. The descriptions for these interactions are the same in both dynamic and static (free from chemical exchange processes) systems. Let n be the number of nuclei in a spin system, fi and /( the indices of the nuclei in it, v/( the frequency (in Hz) corresponding to the chemical shift of fi nuclei and the coupling... [Pg.178]

The equilibrium constant K for an isotopic exchange reaction depends on the vibrational frequency shifts produced upon isotopic substitution and can be calculated in principle from knowledge of the fundamental frequencies of the isotopic species. At high temperatures differences in chemical properties cease. [Pg.200]

In spectra dominated by anisotropic interactions like quadrupolar interactions and chemical shifts, the concept of dynamic broadening due to chemical exchange can be applied to the detection of molecular processes the resonance frequency of a nucleus depends not only on its chemical identity (isotropic chemical shift) but also on its... [Pg.166]

See other pages where Chemical exchange frequency shifts is mentioned: [Pg.62]    [Pg.173]    [Pg.348]    [Pg.3]    [Pg.184]    [Pg.874]    [Pg.288]    [Pg.72]    [Pg.44]    [Pg.196]    [Pg.7]    [Pg.138]    [Pg.322]    [Pg.264]    [Pg.184]    [Pg.186]    [Pg.62]    [Pg.259]    [Pg.342]    [Pg.62]    [Pg.174]    [Pg.279]    [Pg.138]    [Pg.349]    [Pg.191]    [Pg.168]    [Pg.166]    [Pg.153]    [Pg.166]    [Pg.218]    [Pg.50]    [Pg.653]    [Pg.40]    [Pg.3]    [Pg.62]    [Pg.64]    [Pg.116]    [Pg.196]    [Pg.78]    [Pg.465]    [Pg.491]    [Pg.159]    [Pg.520]    [Pg.80]    [Pg.60]    [Pg.108]    [Pg.193]    [Pg.196]   
See also in sourсe #XX -- [ Pg.151 ]



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