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The shielding effect of fluoroaromatics on nuclei was estimated using nucleus-independent chemical shift (NICS) calculations at the GIAO/B3LYP/6-311++G(2d,p) level. The strengths of diamagnetic contributions of hexafluorobenzene at more than 3.5Å above the ring center were estimated to be ca. 0.73 times those of benzene. The chemical shift of a proton located above the fluoroaromatic ring is shifted...
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