Jin et al. 10.1073/pnas.0500852102. |
Fig. 9. SEM micrograph of a powdery precipitate formed from chiral HBC amphiphile (S)-3 in MeTHF. The sample was prepared by slow cooling of a hot solution of (S)-3 (1 mg/ml) from 50° to 30°C, applied onto a silicon substrate, and air-dried. Pt was sputter-deposited on the sample specimen before observation.
Fig. 10.
Time-dependent changes in electronic absorption (a) and CD spectra (b) of chiral HBC amphiphile (S)-2 in ClCy (2 mg/ml) at 20°C on rapid cooling from 50°C in a quartz cell of 0.1-mm path length. The spectra were taken with a 3-min interval.Fig. 11.
TEM micrographs of self-assembled nano-objects from the enantiomers [(S)-2 (a–d) and (R)-2 (e–h)] of chiral HBC amphiphile 2. The samples containing helical coils along with nanotubes were prepared by slow diffusion of a hexane vapor at 20°C into dilute ClCy solutions of 2, applied onto a specimen grid covered with a thin carbon support film, and air-dried.Fig. 12.
TEM micrographs of self-assembled nano-objects from chiral HBC amphiphile 2 at varying mole ratios of its enantiomers in MeTHF at 20°C. The samples were prepared by slow cooling of hot solutions of 2 (1 mg/ml) from 50° to 20°C, and the resulting suspensions were diluted by a factor of 10, applied onto a specimen grid covered with a thin carbon support film, and air-dried.Fig. 13.
DSC thermographs (first heating) of tubularly assembled 2 at varying mole ratios of its enantiomers in MeTHF at 20°C (scan rate 10°C/min).