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• W1987366144 abstract "Tetraanions of alkyl-substituted derivatives of cycloocta[1,2,3,4-def;5,6,7,8-d‘e‘f‘]bisbiphenylene (BPD) and their counter lithium cations self-assemble to form helically stacked assemblies, including a dimer, a trimer, and a tetramer. NMR self-diffusion measurements and unprecedented magnetic shielding effects for the sandwiched lithium cations support their aggregated nature. The D2-tetramer assembly is fully characterized by NMR spectroscopy, providing unequivocal evidence for a helix of four tetraanionic BPD layers with an estimated relative twist angle of about 45° and interlayer spacing of ca. 4 Å. The barrier for racemization through the in-plane inter-deck rotation is ΔG200⧧ = 9.5 ± 0.2 kcal mol-1 in the dimer compared to >15 kcal mol-1 in the tetramer." @default.
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• W1987366144 date "2002-04-05" @default.
• W1987366144 modified "2023-10-17" @default.
• W1987366144 title "Self-Assembled, Helically Stacked Anionic Aggregates of 2,5,8,11-Tetra-<i>tert</i>-butylcycloocta[1,2,3,4-<i>d</i><i>ef</i>;5,6,7,8-<i>d</i><i>‘</i><i>e</i><i>‘</i><i>f</i><i>‘</i>]bisbiphenylene, Stabilized by Electrostatic Interactions" @default.
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• W1987366144 doi "https://doi.org/10.1021/ja012140u" @default.
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