Shielding diamagnetic

Diamagnetic shielding factor, spherical water 1 + crCHjO) 1.000 025 64(7) ... 

The paramagnetic term, apara, derives from the excitation of p-elec-trons by the external held, and its impact is opposite to that of diamagnetic shielding. The term,, derives from the effect of neighboring groups, which can increase or decrease the held at the nucleus, a can also be affected by intermolecular effects, in most cases deriving from interaction of the solvent. 

G. Gawne G. W. Kenner N. H. Rogerts R. C. Sheppard K. Titlestad, Diamagnetic Shielding Effects and the Conformations of Small Peptides. In Peptides E. Bricas, Ed. North-Holland Amsterdam, 1968 pp 28-39. 

Here, is a positive term resulting from diamagnetic shielding by electrons localized on atom A, Op is a term (usually negative) which corrects for any deviation from spherical symmetry of the electrons localized on atom A, represents the effect on atom A (shielding or deshielding) of circulation of electrons localized on other atoms, and 0 ° represents the effect on atom A (shield-... 

Diamagnetic shielding tensor Second rank tensor -1 -2... 

Similar conclusions are also reached for the magnetic shielding of atoms, as revealed by a detailed study of a series of amines, nitriles, ammonia, pyridine, pyra-zine, pyrimidine, and pyridazine [119]. Their local diamagnetic shielding is virtually... 

The slight discrepancies between the spectra of adducts 84 and 86 formed from pyridine with phenyllithium and butyllithium, particularly with respect to the proton at the tetrahedral carbon, were attributed to diamagnetic shielding by the phenyl group. 

Tables 3.2 and 3.3 illustrated for iodine that heavy atom substitution causes a significant upheld shift of the substituted carbon. This is attributed to increased diamagnetic shielding caused by the large number of electrons introduced by heavy atoms.

Compton wavelength of neutron Compton wavelength of proton Diamagnetic shielding factor, spherical H20 molecule Electron g factor Electron magnetic moment Electron radius (classical) Electron rest mass... 

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