Characterization of Hydrogen Bonds in the End-Functionalized Single-Wall Carbon Nanotubes: A DFT Study

다국어 초록 (Multilingual Abstract)

A systematic computational study is carried out to shed some light on the structure of semiconducting armchair single-wall carbon nanotubes (n; n) SWCNTs, n = 4, 5 and 6, functionalized at the end with carboxyl (–COOH) and amide (–CONH2) from the viewpoint of characterizing the intramolecular hydrogen bondings at the B3LYP/6-31++G(d, p) level. Geometry parameters display different types of intramolecular hydrogen bonding possibilities in the considered functionalized SWCNTs. All of the hydrogen bondings are confirmed by natural bonding orbitals (NBO) analysis as well as nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) parameters. Based on NBO analysis, the calculated nO → σ*CH delocalization energies E(2), 1.15 kcal/mol to 7.04 kcal/mol, are in direct relation with the hydrogen bonding strengths. Differences in the chemical shielding principal components of 13C(=O) and 17O isotropic chemical shieldings, σiso, consistent with the NBO analysis. The considerable changes of 13C/17O σiso can be interpreted as a result of shielding tensor component orientation. The 13C(=O) and 17O quadrupole coupling constants CQ decrease under the effect of hydrogen bonding while asymmetry parameters ηQ significantly increase, indicating that 17O ηQ is more sensitive to hydrogen bondings.

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