Pre-regulation of the planar chirality of pillar[5]arenes for preparing discrete chiral nanotubes

Pillar[5]arene-based chiral nanotube formation via pre-regulation of the building blocks' chirality is more efficient than post-regulating the chirality of nanotubes.

Growth and SHG of a 3D chiral nanoporous coordination framework consisting of homochiral nanotubes

A 3D chiral nanoporous coordination framework consisting of homochiral nanotubes was synthesized. The sample was assembled from octuple helices. The chiral nanotube had a free aperture about 20 A. The structure of the sample was characterized by X-ray diffraction. The UV–Vis was used to investigate the optical property of the sample. The absorption appears in the range of 210–290 nm. Second harmonic generation (SHG) was studied by powder measurement using a YAG laser. Especially, the efficient SHG of sample is about 3.5[Formula: see text] of urea.

Ab Inito Study of Absorption Spectra in Ultra Small Diameter Single Walled Boron Nanotubes

We have investigated the absorption spectra in ultra small diameter single walled boron nanotubes for parallel and perpendicular polarized light as well as unpolarized light. In this paper we have studied absorption spectra for armchair (3,3),zigzag (5,0) and chiral (4,2) boron nanotubes containing 12, 20 and 56 atoms respectively. It is observed that absorption is highest for armchair followed by zigzag and chiral nanotubes. It is also found that absorption is higher for (3,3) and (5,0) nanotubes for perpendicular polarized light as compared to parallel polarized light, whereas chiral nanotube shows higher and wide range of absorption for parallel polarized light instead of perpendicular polarized light. We have compared our results with SWCNT and SWBNNT of same chiral vectors.