NDLI: On the balance between syn- and anticlinicity in smectic phases formed by achiral hockey-stick mesogens with and without chiral dopants

Content Provider	Royal Society of Chemistry (RSC)
Author	Findeisen-Tandel, Sonja Enz, Eva Baumeister, Ute Lagerwall, Jan Weissflog, Wolfgang Dabrowski, Roman Giesselmann, Frank
Copyright Year	2009
Abstract	A series of achiral hockey-stick-shaped mesogens forming tilted smectic liquid crystal phases of synclinic SmC- as well as anticlinic SmCa-type was prepared and characterized. While all homologues exhibit both phases, the balance shifts from anticlinic to synclinic order upon elongation of the terminal chain at the meta- position, defining the hockey-stick shape. The elongation also leads to an increased kinetic hindrance of the transition between syn- and anticlinic phases and a decreased transition enthalpy. These observations indicate that a well-defined kink (short meta-substituted chain) promotes the anticlinic structure while a higher flexibility between kinked and rod-shape (long meta-substituted chain) promotes synclinic order. An intermediate chain-length homologue was selected as host material for doping with syn- and anticlinic rod-shaped chiral dopants, respectively, at varying concentrations. Opposite of what might be expected the balance between syn- and anticlinic order was not simply dictated by the choice of dopant. Instead, both types of tilting order prevailed with roughly the same strength as in the achiral host regardless of which chiral material was added, up to concentrations well beyond normal doping conditions. Thus, at least with hockey-stick-shaped achiral hosts, syn- as well as anticlinic chiral compounds can be used effectively as chiral dopants without necessarily having an important impact on the clinicity of the resulting mixture. The hockey-stick design concept should be useful in producing achiral anticlinic-forming mesogens for low-polarization, long-pitch antiferroelectric liquid crystal mixtures. Finally, we point out that a mixture study like the one carried out here yields a conclusive means of establishing the clinicity of achiral tilted smectics, an endeavour that can sometimes be far from trivial.
Starting Page	2950
Ending Page	2957
Page Count	8
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	19
Issue Number	19
Journal	Journal of Materials Chemistry
DOI	10.1039/b820717h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Liquid crystal Enthalpy Dopant Bacillus Chirality
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The detection of chiral perturbations in ferroelectric liquid crystals induced by dopants with axially chiral 2,2′-spirobiindan-1,1′-dione cores

Ferroelectric liquid crystals induced by dopants with axially chiral 2,2′-spirobiindan-1,1′-dione cores: substituent effect on the polarization power

Ferroelectricity of induced smectic C* phases

Coupling between chirality and odd-even effect of twin materials in smectic liquid-crystalline phases

Chirality transfer from atropisomeric chiral inducers to nematic and smectic liquid crystals – synthesis and characterization of di- and tetra-substituted axially chiral binaphthyl derivatives

Influence of substituent and linking moiety on chirality in achiral bent core mesogens _ synthesis and characterization

Influence of substituent and linking moieties on phase structures of achiral hockey_stick mesogens _ synthesis and characterization

Novel liquid-crystalline mesogens and main-chain chiral smectic thiol-ene polymers based on trifluoromethylphenyl moieties

Mesomorphic properties and spontaneous polarization of ferroelectric liquid crystal mixtures based on chiral dopants synthesized by chiral hydroboration

On the balance between syn- and anticlinicity in smectic phases formed by achiral hockey-stick mesogens with and without chiral dopants

Similar Documents

The detection of chiral perturbations in ferroelectric liquid crystals induced by dopants with axially chiral 2,2′-spirobiindan-1,1′-dione cores

Ferroelectric liquid crystals induced by dopants with axially chiral 2,2′-spirobiindan-1,1′-dione cores: substituent effect on the polarization power

Ferroelectricity of induced smectic C* phases

Coupling between chirality and odd-even effect of twin materials in smectic liquid-crystalline phases

Chirality transfer from atropisomeric chiral inducers to nematic and smectic liquid crystals – synthesis and characterization of di- and tetra-substituted axially chiral binaphthyl derivatives

Influence of substituent and linking moiety on chirality in achiral bent core mesogens _ synthesis and characterization

Influence of substituent and linking moieties on phase structures of achiral hockey_stick mesogens _ synthesis and characterization

Novel liquid-crystalline mesogens and main-chain chiral smectic thiol-ene polymers based on trifluoromethylphenyl moieties

Mesomorphic properties and spontaneous polarization of ferroelectric liquid crystal mixtures based on chiral dopants synthesized by chiral hydroboration

On the balance between syn- and anticlinicity in smectic phases formed by achiral hockey-stick mesogens with and without chiral dopants