Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Anisotropic shielding surfaces

Scheme 4. Anisotropic shielding surface surrounding the nitrate anion. Scheme 4. Anisotropic shielding surface surrounding the nitrate anion.
Figure 1 Calculated ring current effects of 1,2-dloxln, 1,2-oxathlln, and 1,2-dithiin (in comparison with the ring current effects of cyclobuta-1,3-dlene, benzene and the anisotropic effect of buta-1,3-dlene) shielding isochemical shielding surface (ICSS) of -0.1 ppm, gray, and deshielding ICSS of 0.1 ppm, dark gray. Figure 1 Calculated ring current effects of 1,2-dloxln, 1,2-oxathlln, and 1,2-dithiin (in comparison with the ring current effects of cyclobuta-1,3-dlene, benzene and the anisotropic effect of buta-1,3-dlene) shielding isochemical shielding surface (ICSS) of -0.1 ppm, gray, and deshielding ICSS of 0.1 ppm, dark gray.
The aromatic surface of the capsule forms favorable CH-n interactions with included guests and provides anisotropic shielding of guest molecules. A map of induced magnetic shielding for the inner space was obtained through nucleus independent chemical shift (NICS) calculations. Comparison of these values with the experimentally measured H NMR upheld shifts provides a means to pinpoint the exact position of guest inside the capsule. [Pg.138]

See other pages where Anisotropic shielding surfaces is mentioned: [Pg.149]    [Pg.149]    [Pg.148]    [Pg.149]    [Pg.101]    [Pg.91]    [Pg.1264]    [Pg.252]    [Pg.262]    [Pg.96]    [Pg.547]    [Pg.163]    [Pg.251]    [Pg.106]    [Pg.12]    [Pg.455]    [Pg.96]    [Pg.235]    [Pg.441]    [Pg.1006]   


SEARCH



Anisotropic surfaces

Surface shielding

© 2024 chempedia.info