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• W1992815284 abstract "Milligram amounts of the new compounds 1,9- and 1,7-C60F(CF3) (ca. 85:15 mixture of isomers) and C60F3(CF3) were isolated from a high-temperature C60/K2PtF6 reaction mixture and purified to 98 mol % compositional purity by two-dimensional high-performance liquid chromatography using Buckyprep and Buckyclutcher columns. The previously observed compounds C60F5(CF3) and C60F7(CF3) were also purified to 90+ mol % for the first time. Variable-temperature 19F NMR spectra of the mixture of C60F(CF3) isomers and the previously reported mixture of C(s)- and C1-C60F17(CF3) isomers demonstrate for the first time that fullerene(F)n(CF3)m derivatives with adjacent F and CF3 substituents exhibit slow-exchange limit hindered CF3 rotation spectra at -40 +/- 10 degrees C. The experimental and density functional theory (DFT) predicted deltaH++ values for CF3 rotation in 1,9-C60F(CF3) are 46.8(7) and 46 kJ mol(-1), respectively. The DFT-predicted deltaH++ values for 1,7-C60F(CF3), C(s)-C60F17(CF3), and C1-C60F17(CF3) are 20, 44, and 54 kJ mol(-1), respectively. The (> or = 4)J(FF) values from the slow-exchange-limit 19F spectra, which vary from ca. 0 to 48(1) Hz, show that the dominant nuclear spin-spin coupling mechanism is through-space coupling (i.e., direct overlap of fluorine atom lone-pair orbitals) rather than coupling through the sigma-bond framework. The 2J(FF) values within the CF3 groups vary from 107(1) to 126(1) Hz. Collectively, the NMR data provide an unambiguous set of (> or = 4)J(FF) values for three different compounds that can be correlated with DFT-predicted or X-ray diffraction derived distances and angles and an unambiguous set of 2J(FF) values that can serve as an internal standard for all future J(FF) calculations." @default.
• W1992815284 created "2016-06-24" @default.
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• W1992815284 date "2005-07-21" @default.
• W1992815284 modified "2023-10-14" @default.
• W1992815284 title "Variable-Temperature ¹⁹F NMR and Theoretical Study of 1,9- and 1,7-C₆₀F(CF₃) and <i>C</i><i>_s</i>- and <i>C</i>₁-C₆₀F₁₇(CF₃): Hindered CF₃ Rotation and Through-Space <i>J</i>_FF Coupling" @default.
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• W1992815284 doi "https://doi.org/10.1021/ja051954y" @default.
• W1992815284 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16089480" @default.
• W1992815284 hasPublicationYear "2005" @default.
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