乐胖代购免代理版

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The shielding tensor of the carbon nuclei in both molecules is strongly anisotropic and its out\u2010of\u2010plane component determines the up\u2010field chemical shift of 13<\/jats:sup>C in nuclear magnetic resonance spectra. The \u03c0\u2010ring currents flowing beyond the C\u2010skeleton in front of a probe carbon nucleus, and on remote parts of the molecular perimeter, yield positive contributions to the out\u2010of\u2010plane component of carbon shielding as big as \u224810\u201315% of the total values. Near Hartree\u2010Fock estimates of magnetizability and magnetic shielding at the nuclei fully consistent with the current model are reported. \u00a9 2008 Wiley Periodicals, Inc. 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