Multi-responsible chameleon molecule with chiral naphthyl and azobenzene moieties

Soft Matter
Dae-Yoon KimKwang-Un Jeong

Abstract

A photochromic chiral molecule with azobenzene mesogens and a (R)-configuration naphthyl moiety (abbreviated as NCA2M) was specifically designed and synthesized for the demonstration of chameleon-like color changes responding to multitudinous external stimuli, such as temperature, light and electric field. The basic phase transition behaviors of NCA2M were first studied by the combination of differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Based on the structure-sensitive X-ray diffraction results obtained at different temperatures, it was comprehended that the NCA2M molecule exhibited the tilted version of highly ordered smectic crystal phase with 5.45 nm layer thickness. Chiral nematic (N*) liquid crystals (LC) with helical superstructures were formed by doping the NCA2M photochromic chiral molecule in an achiral nematic (N) LC medium. By controlling the helical pitch length of N*-LC with respect to temperature, light and electric field, the wavelength of selectively reflected light from the N* photonic crystal was finely tuned. The light-induced color change of N*-LC film was the most efficient method for covering the whole visible region from blue to green and to red, which allowed us to fabri...Continue Reading

References

Oct 13, 2006·Journal of the American Chemical Society·Liliana Cseh, Georg H Mehl
Jan 26, 2007·The Journal of Physical Chemistry. B·Kwang-Un JeongStephen Z D Cheng
Oct 12, 2007·Journal of the American Chemical Society·Quan LiJ William Doane
Jan 16, 2008·The Journal of Physical Chemistry. B·Deng-Ke YangS Z D Cheng
May 14, 2009·Journal of the American Chemical Society·Changjoon KangEdwin L Thomas
Sep 19, 2009·Organic & Biomolecular Chemistry·Lisa GreenQuan Li
Nov 20, 2009·Journal of the American Chemical Society·Stéphane DiringRaymond Ziessel
Sep 21, 2013·Chemical Communications : Chem Comm·Xingwu ChenHuai Yang
Nov 25, 2014·Chemistry : a European Journal·Dae-Yoon KimKwang-Un Jeong

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Citations

Jun 13, 2015·Chemical Communications : Chem Comm·Dae-Yoon KimKwang-Un Jeong
Oct 26, 2016·Chemical Communications : Chem Comm·Dae-Yoon KimKwang-Un Jeong
Mar 16, 2019·Frontiers in Chemistry·Juan PangXiaohong Hu
Dec 23, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Dongxu ZhaoXiaolin Xie

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