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- W1990151166 abstract "Although for planar conjugated hydrocarbons the out-of-plane component of proton magnetic shielding is an unquestionable quantitative aromaticity indicator, the same is not true for tetraazanaphthalenes. As in these compounds the (core + σ)-currents associated to the nitrogen nuclei diminish the perpendicular component of shielding, abnormal values of 1H NMR σzz are obtained. Therefore, a consistent aromaticity measure must be based only on the π-contribution to the out-of-plane component of proton magnetic shielding. Otherwise, the behavior of these compounds in presence of an external magnetic field parallels that of naphthalene, with the nitrogen nuclei contributing to the ring current in a comparable amount to carbon nuclei. The π-current contribution to magnetic shielding represents 6–8% of the out-of-plane shielding for nitrogen and 9–12% for carbon." @default.
- W1990151166 created "2016-06-24" @default.
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- W1990151166 date "2009-01-01" @default.
- W1990151166 modified "2023-09-28" @default.
- W1990151166 title "How nitrogen modifies the nuclear magnetic shielding in tetraazanaphthalenes" @default.
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- W1990151166 doi "https://doi.org/10.1039/b823388h" @default.
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