The synthesis of the chiral non-mesogenic D-seco estrone derivatives and their influence on the phase transitions of cholesteric liquid crystals

D. Ž Obadović, A. Vajda, M. Stančić, S. Jovanović-Šanta, J. Petrović, D. Lazar

Research output: Contribution to journalArticle

Abstract

The synthesis of new chiral seco-estrone derivatives is presented, as well as their influence on the phase transition of binary mixtures of cholesteryc liquid crystals. The new chiral derivatives do not posses any liquid crystalline phases and were synthesized in several synthetic steps, starting from estrone. We have studied the mixtures of cholesteryl non-anoate (40%) with cholesteryl myristate (40%) and addition of new chiral derivatives 3, 4, or 5 (20%). It was concluded that the addition of chiral derivative 3 to the binary mixture stabilizes smectic A and cholesteric phase and shifts the phase transition temperature with respect to pure binary mixture for about 5°C towards lower temperatures. The extension of the temperature range of the cholesteric phase from 5°C to 15°C was established in the case when the derivatives 3 and 4 are added to the binary mixture of cholesteryl nonanoate with cholesteryl myristate. The phase diagrams of investigated compounds are formed on the basis of data obtained by the optical microscopy. Using X-ray diffraction on the crystalline powder of unoriented samples we have determined the molecular parameters: the thickness of smectic and cholesteric layers and average distance between the long axes of neighboring molecules.

Original languageEnglish
Pages (from-to)509-519
Number of pages11
JournalPhase Transitions
Volume74
Issue number4
Publication statusPublished - 2001

Fingerprint

Cholesteric liquid crystals
Estrone
binary mixtures
Binary mixtures
Phase transitions
liquid crystals
Derivatives
synthesis
Crystalline materials
Liquid Crystals
Powders
Liquid crystals
transition temperature
phase diagrams
Superconducting transition temperature
Phase diagrams
Optical microscopy
microscopy
shift
liquids

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

The synthesis of the chiral non-mesogenic D-seco estrone derivatives and their influence on the phase transitions of cholesteric liquid crystals. / Obadović, D. Ž; Vajda, A.; Stančić, M.; Jovanović-Šanta, S.; Petrović, J.; Lazar, D.

In: Phase Transitions, Vol. 74, No. 4, 2001, p. 509-519.

Research output: Contribution to journalArticle

Obadović, DŽ, Vajda, A, Stančić, M, Jovanović-Šanta, S, Petrović, J & Lazar, D 2001, 'The synthesis of the chiral non-mesogenic D-seco estrone derivatives and their influence on the phase transitions of cholesteric liquid crystals', Phase Transitions, vol. 74, no. 4, pp. 509-519.
Obadović, D. Ž ; Vajda, A. ; Stančić, M. ; Jovanović-Šanta, S. ; Petrović, J. ; Lazar, D. / The synthesis of the chiral non-mesogenic D-seco estrone derivatives and their influence on the phase transitions of cholesteric liquid crystals. In: Phase Transitions. 2001 ; Vol. 74, No. 4. pp. 509-519.
@article{a0488f265a3443c99752db19349a5866,
title = "The synthesis of the chiral non-mesogenic D-seco estrone derivatives and their influence on the phase transitions of cholesteric liquid crystals",
abstract = "The synthesis of new chiral seco-estrone derivatives is presented, as well as their influence on the phase transition of binary mixtures of cholesteryc liquid crystals. The new chiral derivatives do not posses any liquid crystalline phases and were synthesized in several synthetic steps, starting from estrone. We have studied the mixtures of cholesteryl non-anoate (40{\%}) with cholesteryl myristate (40{\%}) and addition of new chiral derivatives 3, 4, or 5 (20{\%}). It was concluded that the addition of chiral derivative 3 to the binary mixture stabilizes smectic A and cholesteric phase and shifts the phase transition temperature with respect to pure binary mixture for about 5°C towards lower temperatures. The extension of the temperature range of the cholesteric phase from 5°C to 15°C was established in the case when the derivatives 3 and 4 are added to the binary mixture of cholesteryl nonanoate with cholesteryl myristate. The phase diagrams of investigated compounds are formed on the basis of data obtained by the optical microscopy. Using X-ray diffraction on the crystalline powder of unoriented samples we have determined the molecular parameters: the thickness of smectic and cholesteric layers and average distance between the long axes of neighboring molecules.",
author = "Obadović, {D. Ž} and A. Vajda and M. Stančić and S. Jovanović-Šanta and J. Petrović and D. Lazar",
year = "2001",
language = "English",
volume = "74",
pages = "509--519",
journal = "Phase Transitions",
issn = "0141-1594",
publisher = "Taylor and Francis Ltd.",
number = "4",

}

TY - JOUR

T1 - The synthesis of the chiral non-mesogenic D-seco estrone derivatives and their influence on the phase transitions of cholesteric liquid crystals

AU - Obadović, D. Ž

AU - Vajda, A.

AU - Stančić, M.

AU - Jovanović-Šanta, S.

AU - Petrović, J.

AU - Lazar, D.

PY - 2001

Y1 - 2001

N2 - The synthesis of new chiral seco-estrone derivatives is presented, as well as their influence on the phase transition of binary mixtures of cholesteryc liquid crystals. The new chiral derivatives do not posses any liquid crystalline phases and were synthesized in several synthetic steps, starting from estrone. We have studied the mixtures of cholesteryl non-anoate (40%) with cholesteryl myristate (40%) and addition of new chiral derivatives 3, 4, or 5 (20%). It was concluded that the addition of chiral derivative 3 to the binary mixture stabilizes smectic A and cholesteric phase and shifts the phase transition temperature with respect to pure binary mixture for about 5°C towards lower temperatures. The extension of the temperature range of the cholesteric phase from 5°C to 15°C was established in the case when the derivatives 3 and 4 are added to the binary mixture of cholesteryl nonanoate with cholesteryl myristate. The phase diagrams of investigated compounds are formed on the basis of data obtained by the optical microscopy. Using X-ray diffraction on the crystalline powder of unoriented samples we have determined the molecular parameters: the thickness of smectic and cholesteric layers and average distance between the long axes of neighboring molecules.

AB - The synthesis of new chiral seco-estrone derivatives is presented, as well as their influence on the phase transition of binary mixtures of cholesteryc liquid crystals. The new chiral derivatives do not posses any liquid crystalline phases and were synthesized in several synthetic steps, starting from estrone. We have studied the mixtures of cholesteryl non-anoate (40%) with cholesteryl myristate (40%) and addition of new chiral derivatives 3, 4, or 5 (20%). It was concluded that the addition of chiral derivative 3 to the binary mixture stabilizes smectic A and cholesteric phase and shifts the phase transition temperature with respect to pure binary mixture for about 5°C towards lower temperatures. The extension of the temperature range of the cholesteric phase from 5°C to 15°C was established in the case when the derivatives 3 and 4 are added to the binary mixture of cholesteryl nonanoate with cholesteryl myristate. The phase diagrams of investigated compounds are formed on the basis of data obtained by the optical microscopy. Using X-ray diffraction on the crystalline powder of unoriented samples we have determined the molecular parameters: the thickness of smectic and cholesteric layers and average distance between the long axes of neighboring molecules.

UR - http://www.scopus.com/inward/record.url?scp=27844612120&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=27844612120&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:27844612120

VL - 74

SP - 509

EP - 519

JO - Phase Transitions

JF - Phase Transitions

SN - 0141-1594

IS - 4

ER -