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In the calculated structures by MM method, the intramolecular nonbonded N⋯N distances (1.14-1.18 nm for small space, 1.51-1.59 nm for large space) in 3a with the biphenylene spacer are longer than those (0.76-0.80 nm for small space, 1.09-1.12 nm for large space) in 3d with the phenylene spacer, suggesting the possible entanglement at the terminal moieties. A similar trend was observed in the comparison of 3c with 3e.
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A weak and broad halo was observed in the wide angle region. A shoulder detected ca. 24°degree would be attributed to the intracolumnar disk-disk distance of ca. 0.37 nm, which is comparable to those (0.35-0.36 nm) of alkyl-chain-containing aryl-substituted triphenylenes and hexaazatriphenylenes: see ref 11e and Boden, N.; Bushby, R. J.; Headdock, G.; Lozman, O. R.; Wood, A. Liq. Cryst. 2001, 28, 139 -144. Around room temperature, 3a indicated weak and broad reflections, suggesting the formation of an amorphous type solid. In contrast, 3c showed the multiple reflections arising from the formation of a crystalline solid at the lower temperature.
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note
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XRD diffraction pattern of the xerogel of 3a was similar to that observed in the liquid crystalline state, although the reflections (100 reflection and halo) were detected very slightly. The result seems to suggest the formation of the hexagonal packing also in the organogel phase. Probably, almost organogel fibrous structure was decomposed during the freeze-drying treatment to prepare the xerogel.
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48
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14044253921
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note
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c, respectively, along with further peak broadening (Figure S2-b). The results suggest the slow gelation process based on the formation of the π-stacked aggregate and the subsequent self-assembling and entanglement. The lower magnetic field shift during the gel generation process is not clear at the moment. We feel that the first higher magnetic field shift is ascribe to the π-π stacking among the HAT core moieties and the subsequent lower magnetic field shift to the further self-assembling and the entanglement of the formed π-stacked aggregate.
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