New TGBA series exhibiting a SC*SASA*N* phase sequence

Bouchta, A.; Nguyen, H. T.; Achard, M. F.; Hardouin, F.; Destrade, C.; Twieg, Robert J.; Maaroufi, A.; Isaert, N.

doi:10.1080/02678299208029094

Cited by 62 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…An excellent planar orientation is needed to obtain regular Grandjean-Cano steps in the TGBC, TGBA and N* phases. 7,19,20 These steps are parallel to the prism edge and correspond to a half pitch thickness increases, therefore they allow helical pitch measurement. If the helical pitch values vary between 0.25 mm and 0.5 mm, a selective reflection coloured light is visible.…”

Section: Liquid Crystalline and Physical Propertiesmentioning

confidence: 99%

Novel chiral liquid crystal with two chiral butyl lactate chains exhibiting several frustrated mesophases including smectic Q and TGB phases separated by an optically isotropic phase

et al. 2004

Self Cite

View full text Add to dashboard Cite

A novel symmetric liquid crystalline compound with two chiral butyl lactate chains, (S,S)-bis[4-(1butoxycarbonyl)ethyloxycarbonyltolanyl]fumarate (BisBLOCTF), was synthesized. This compound was found to exhibit a very unusual phase sequence involving several frustrated mesophases, namely smectic Q, TGBC, TGBA and blue phases. In addition, an ''optically isotropic'' phase occurs between the smectic Q and the SmC*, and TGB phases. The different phases were studied by optical observation, DSC, X-ray diffraction and helical pitch measurements. Changing the nature of the chiral chains reduces the sequence to only a smectic Q mesophase.

show abstract

Section: Liquid Crystalline and Physical Propertiesmentioning

confidence: 99%

Novel chiral liquid crystal with two chiral butyl lactate chains exhibiting several frustrated mesophases including smectic Q and TGB phases separated by an optically isotropic phase

et al. 2004

Self Cite

View full text Add to dashboard Cite

show abstract

“…As modificações estruturais propostas por Bouchta e colaboradores 30 conduziram à seguinte seqüência de fase K -S C * -S A -TGB A -N* -BP -I (X=H, Y=H e X=F, Y=H; BP=Blue phase) para os homólogos que obedecem a seguinte fórmula geral. …”

Section: Esquemaunclassified

Cristais Líquidos Ferroelétricos - CLF. Uma abordagem sintética

2001

View full text Add to dashboard Cite

“…It usually appearsi nt he temperature range between the N* and Sm phases (SmA/A* or SmC*). [14][15][16][17][18][19][20][21] In the contemporary era of LC research,b ent-core liquid crystals (BCLCs) are the frontrunner, duet ot heir extremely rich, diverse, and unparalleled phases tructures. [22] The presence of the small kink at the molecular core of the BCLC helps to develop additionalo rder (unlike rodlikeo rd isklikeL Cs) that can be polar,b iaxial nematic, octupolar,a nd/or chiral, despite being formed from achiral molecules.…”

Section: Introductionmentioning

confidence: 99%

Chiral Bent‐Shaped Molecules Exhibiting Unusually Wide Range of Blue Liquid‐Crystalline Phases and Multistimuli‐Responsive Behavior

Punjani

Mohiuddin

Kaur

et al. 2020

Chemistry A European J

View full text Add to dashboard Cite

Recently,a nu nprecedented observation of polar order,t hermochromic behavior,a nd exotic mesophases in new chiral, bent-shapeds ystemsw ith a ÀCH 3 moiety placed at the transverse position of the central core was reported. Herein,ah omologous series of compounds with even-numbered carbonc hains from n = 4t o1 8w ere synthesized, in which ÀCl was substituted for ÀCH 3 at the kink position and ad rastic modification in the phase structure of the bentshaped moleculew as observed. An unusuals tabilization of the cubic blue phase (BP) over aw ide range of 16.4 8Ch as been witnessed. Twoh omologues in this series (1-12 and 1-14) exhibit an interesting phase sequence consisting of BPI/ II, chiraln ematic, twist grain boundary,s mectic A, and smectic X( SmX) phases.T he higher homologues( 1-16 and 1-18) stabilizet he SmX phase enantiotropically over the entire temperature range. Crystal structure analysis confirmed the bent molecular architecture, with ab ent angle of 1488,a nd revealed the presenceo ft wo different molecular conformations in an asymmetric unit of compound 1-4. AD FT study corroborated that the ÀCl moiety at the central core of the molecule led to an increasei nt he dipole momenta long the transverse direction, which, in turn, facilitated the unusual stabilization of frustrated structures.C rystal polymorphism has been evidenced in three homologues( 1-10, 1-12, and 1-14) of the series. On the application of mechanical pressure through grinding, compound 1-10 transformedf rom a brighty ellow crystalline solid to ad ark orange-green amorphouss olid, which reversed upon dropwise additiono fd ichloromethane, indicating reversible mechanochromism in this class of compounds. In addition,e xcellent thermochromic behavior has been observed for compound 1-10w ith a controlled temperature-colorcombination.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.[a] Cr = crystal;I so = isotropic;N cyb * = chiral nematic phase composed of Sm clusters;T GBA = twist grain boundary phase;S mectic A = SmA; Smectic X = SmX. [b] Phaset ransitionso bserved by meanso fP OM in an ITO-coated planar cell (antiparallelrubbing). [c] Phase transitionso bserved by means of SAXS/WAXS.( 1-14: Cr 1a = amorphous,C r 2b = transition crystalline state, Cr 3c = crystal polymorph.)Chem.E ur.

show abstract

New TGB_A series exhibiting a S_CS_AS_AN* phase sequence

Cited by 62 publications

References 17 publications

Novel chiral liquid crystal with two chiral butyl lactate chains exhibiting several frustrated mesophases including smectic Q and TGB phases separated by an optically isotropic phase

Novel chiral liquid crystal with two chiral butyl lactate chains exhibiting several frustrated mesophases including smectic Q and TGB phases separated by an optically isotropic phase

Cristais Líquidos Ferroelétricos - CLF. Uma abordagem sintética

Chiral Bent‐Shaped Molecules Exhibiting Unusually Wide Range of Blue Liquid‐Crystalline Phases and Multistimuli‐Responsive Behavior

Contact Info

Product

Resources

About