Syntheses and characterization of novel asymmetric bent-core mesogens exhibiting polar smectic phases

Three series of asymmetric bent-core compounds were synthesized and their mesomorphic properties were studied. All the compounds possess 2-methylresorcinol as central unit and a stilbene bridge as a main element in the structure. Molecules of series I and series II possess only saturated terminal ch...

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Published inJournal of materials chemistry Vol. 19; no. 24; pp. 4240 - 4247
Main Authors GOMOLA, Kinga, LINGFENG GUO, DHARA, Surajit, SHIMBO, Yoshio, GORECKA, Ewa, POCIECHA, Damian, MIECZKOWSKI, Jozef, TAKEZOE, Hideo
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2009
Subjects
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Liquid crystals
Physics
Structure of solids and liquids; crystallography
Polarizing microscope
Differential scanning calorimetry
Temperature dependence
Smectic crystals
Polar crystals
Dynamic properties
XRD
Phase transitions
Mesogenic compound
Optical microscopy
Electro-optical effects
Miscibility
Mesophases
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Abstract Three series of asymmetric bent-core compounds were synthesized and their mesomorphic properties were studied. All the compounds possess 2-methylresorcinol as central unit and a stilbene bridge as a main element in the structure. Molecules of series I and series II possess only saturated terminal chains while those of series III have one or both unsaturated chain/s. The mesophases were characterized by using optical polarizing microscopy, differential scanning calorimetry, X-ray diffraction, electrooptic and dielectric measurements, and miscibility studies. All the compounds exhibit the isotropic to SmAP(R) phase transition and the B(1RevTilted) phase at lower temperatures. For compounds with one olefinic terminal chain, the temperature range of the SmAP(R) phase was found to be narrower in comparison to compounds with both saturated terminal chains. A detailed dielectric investigation was carried out on both the SmAP(R) and B(1RevTilted) phases and two different types of dynamical behaviour were observed.
AbstractList Three series of asymmetric bent-core compounds were synthesized and their mesomorphic properties were studied. All the compounds possess 2-methylresorcinol as a central unit and a stilbene bridge as a main element in the structure. Molecules of series I and series II possess only saturated terminal chains while those of series III have one or both unsaturated chain/s. The mesophases were characterized by using optical polarizing microscopy, differential scanning calorimetry, X-ray diffraction, electrooptic and dielectric measurements, and miscibility studies. All the compounds exhibit the isotropic to SmAP(R) phase transition and the B(1RevTilted) phase at lower temperatures. For compounds with one olefinic terminal chain, the temperature range of the SmAP(R) phase was found to be narrower in comparison to compounds with both saturated terminal chains. A detailed dielectric investigation was carried out on both the SmAP(R) and B(1RevTilted) phases and two different types of dynamical behaviour were observed.
Three series of asymmetric bent-core compounds were synthesized and their mesomorphic properties were studied. All the compounds possess 2-methylresorcinol as central unit and a stilbene bridge as a main element in the structure. Molecules of series I and series II possess only saturated terminal chains while those of series III have one or both unsaturated chain/s. The mesophases were characterized by using optical polarizing microscopy, differential scanning calorimetry, X-ray diffraction, electrooptic and dielectric measurements, and miscibility studies. All the compounds exhibit the isotropic to SmAP(R) phase transition and the B(1RevTilted) phase at lower temperatures. For compounds with one olefinic terminal chain, the temperature range of the SmAP(R) phase was found to be narrower in comparison to compounds with both saturated terminal chains. A detailed dielectric investigation was carried out on both the SmAP(R) and B(1RevTilted) phases and two different types of dynamical behaviour were observed.
Author POCIECHA, Damian
TAKEZOE, Hideo
SHIMBO, Yoshio
GORECKA, Ewa
DHARA, Surajit
GOMOLA, Kinga
LINGFENG GUO
MIECZKOWSKI, Jozef
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  givenname: Kinga
  surname: GOMOLA
  fullname: GOMOLA, Kinga
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  surname: LINGFENG GUO
  fullname: LINGFENG GUO
  organization: Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8552, Japan
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  givenname: Surajit
  surname: DHARA
  fullname: DHARA, Surajit
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  organization: Chemistry Department, Warsaw University, Al. Zwirki i Wigury 101, 02-089 Warsaw, Poland
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  givenname: Hideo
  surname: TAKEZOE
  fullname: TAKEZOE, Hideo
  organization: Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8552, Japan
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Issue 24
Keywords Polarizing microscope
Differential scanning calorimetry
Temperature dependence
Smectic crystals
Polar crystals
Dynamic properties
XRD
Phase transitions
Mesogenic compound
Optical microscopy
Electro-optical effects
Miscibility
Mesophases
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SubjectTerms Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Liquid crystals
Physics
Structure of solids and liquids; crystallography
Title Syntheses and characterization of novel asymmetric bent-core mesogens exhibiting polar smectic phases
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