Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 6, 2012
Previous Article Next Article

Notable formation of a cubic phase from small bent-angle molecules based on the 1,7-naphthalene central core and alkylthio tails

Author affiliations

Abstract

The mesomorphic properties of small angle, bent-shaped molecules [N(1,7)-S-n] consisting of a 1,7-naphthalene central core, typical Schiff-base side wings, and alkylthio tails with the carbon number n have been investigated, and a notable formation of a cubic (Cub) phase in addition to a distinct hexagonal columnar (Colh) phase was observed. The Cub phase can form when the terminal chain length is longer than 22 and is stable over a wider temperature range (25 °C) as the length increases up to 30. The space symmetry of the Cub phase was determined as Pm[3 with combining macron]n with a lattice size of 160–170 Å regardless of the terminal chain length. Assuming that the cubic unit cell is composed of a spherical assembly with a spatial electron density distribution, it can be described as containing eight spheres, each having a radius of 53 Å and comprising 300 molecules. This formation of a novel Cub phase, like the micellar assembly phases, was understood as an enclosed layer formation caused by layer deformation with significant curvature resulting from the asymmetric packing of bent molecules in combination with the longer alkylthio tail groups of N(1,7)-S-n. It is noteworthy that the present observation of a Cub phase with unequivocal experimental evidence establishing both its lattice structure and size is the first example of a novel self-assembly mode in a bent-core liquid crystal (LC) molecular system.

Graphical abstract: Notable formation of a cubic phase from small bent-angle molecules based on the 1,7-naphthalene central core and alkylthio tails

Back to tab navigation

Supplementary files

Article information


Submitted
14 Aug 2011
Accepted
17 Nov 2011
First published
22 Dec 2011

Soft Matter, 2012,8, 1916-1922
Article type
Paper

Notable formation of a cubic phase from small bent-angle molecules based on the 1,7-naphthalene central core and alkylthio tails

S. Kang, M. Harada, X. Li, M. Tokita and J. Watanabe, Soft Matter, 2012, 8, 1916
DOI: 10.1039/C1SM06554H

Social activity

Search articles by author

Spotlight

Advertisements