Abstract
Density functional theory (DFT) calculations are performed for a representative set of low-energy structures of C60-n Si n heterofullerenes (n = 1, 2, 6, 12, 20, 24, 30) to investigate the effect of silicon doping on the electron structure of fullerene. The results show that chemical shielding (CS) parameters are so sensitive to the structural distortion made by outwardly relaxing silicon doped atoms from the fullerene surface which results in puckered Si-doped rings. As a result, the chemical shifts of the nearest carbon sites of silicon atoms considerably shift to downfield. Our survey shows that those first neighbors of silicon atoms which have minor 13C chemical shift belong to normal (un-puckered) rings. Meanwhile, the chemical shielding anisotropy (Δσ) parameter detects the effects of dopant so that Δσ values of the carbon atoms which are contributed to the Si–C bond are mainly larger than the others. Compensation between diatropic and paratropic ring currents lead to less negative NICS values at cage centers of Si-doped fullerenes than that of C60 except C58Si2-b and C54Si6-b in which more negative NICS values may be attributed to more spherical geometries of their carbon cages.
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Ghafouri, R., Anafcheh, M. A Computational NICS and 13C NMR Characterization of C60−n Si n Heterofullerenes (n = 1, 2, 6, 12, 20, 24, 30). J Clust Sci 23, 469–480 (2012). https://doi.org/10.1007/s10876-012-0456-0
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DOI: https://doi.org/10.1007/s10876-012-0456-0