623149-05-3Relevant academic research and scientific papers
Effect of alkylthio tail on phase behaviors of bent-shaped molecules based on naphthalene core
Li, Xiaodong,Lee, Seng Kue,Kang, Sungmin,Tokita, Masatoshi,Kawauchi, Susumu,Watanabe, Junji
supporting information; scheme or table, p. 424 - 425 (2010/03/04)
New bent-shaped molecules with naphthalene central core and alkylthio tail are prepared, and their banana phase structures and properties are discussed in comparison with those of conventional alkoxy molecules. Copyright
Spontaneous formation of a chiral structure in an achiral banana-shaped molecular system
Thisayukta, Jirakorn,Kamee, Hiroyuki,Kawauchi, Susumu,Watanabe, Junji
, p. 63 - 75 (2007/10/03)
We have synthesized a new banana-shaped compound, having naphthalene as a center of molecule. This compound exhibited an unconventional smectic texture by optical microscopy where the growth of small-fractal domains was observed. Moreover, two different chiral domains were found to form in the smectic phase as well as in the Smblue phase which can be considered to possess a helical structure. The details will be discussed.
Distinct formation of a chiral smectic phase in achiral banana-shaped molecules with a central core based on a 2,7-dihydroxynaphthalene unit
Thisayukta, Jirakorn,Nakayama, Yusuke,Kawauchi, Susumu,Takezoe, Hideo,Watanabe, Junji
, p. 7441 - 7448 (2007/10/03)
We have prepared a novel series of banana-shaped molecules with a central bent core based on a 2,7-dihydroxynaphthalene group, the side wings containing a Schiff's based moiety, and alkoxy flexible tails with carbon numbers n = 6, 8, 10, 12, 14, and 16. Among these, the molecules with n = 8-16 formed a novel smectic phase. Its smectic layer possessed a liquidlike association of the molecules similar to the SmA or SmC phase, although the texture that developed from the isotropic melt was unconventional. Small fractal domains initially grew and then coalesced into several large domains. Very weak birefringence and fine structure without any anisotropy are characteristic of this phase. It is interesting to note that two different domains exist showing the opposite sign of optical rotation. Strong circular dichroism (CD) with a peak at 430 nm was also observed for each domain with the opposite sign. The results suggest a natural occurrence of the helix in these materials. The right-handed and left-handed helices were formed with equal probabilities, but the left-handed helix was selectively formed by the introduction of a chiral dopant. The molecule with n = 6 formed a frustrated smectic phase, which exhibited a simple fan-shaped texture.
