Design and investigation of de Vries liquid crystals based on 5-phenyl-pyrimidine and (R,R)-2,3-epoxyhexoxy backbone

S. P. Sreenilayam, D. Rodriguez-Lojo, V. P. Panov, V. Swaminathan, J. K. Vij, Yu P. Panarin, E. Gorecka, A. Panov, P. J. Stevenson

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Calamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The one involving a perfluorinated chain shows SmA∗ phase over a wide temperature range of 82 °C, whereas the siloxane analog exhibits both SmA∗ and SmC∗ phases over a broad range of temperatures, and a weak first-order SmA∗-SmC∗ transition is observed. For the siloxane analog, the reduction factor for the layer shrinkage R (relative to its thickness at the SmA∗-SmC∗ transition temperature, TAC) is ∼0.373, and layer shrinkage is 1.7% at a temperature of 13 °C below the TAC. This compound is considered to have "de Vries smectic" characteristics with the de Vries coefficient CdeVries of ∼0.86 on the scale of zero (maximum-layer shrinkage) to 1 (zero-layer shrinkage). A three-parameter mean-field model is introduced for the orientational distribution function (ODF) to reproduce the electro-optic properties. This model explains the experimental results and leads to the ODF, which exhibits a crossover from the sugar-loaf to diffuse-cone ODF some 3 °C above TAC.

Original languageEnglish
Article number042701
Number of pages13
JournalPhysical Review E
Volume96
Issue number4
DOIs
Publication statusPublished - 03 Oct 2017
Externally publishedYes

Fingerprint

pyrimidines
Shrinkage
Backbone
shrinkage
Liquid Crystal
siloxanes
liquid crystals
Distribution Function
distribution functions
analogs
Analogue
Mean-field Model
Electro-optics
Zero
sugars
Sugars
Range of data
electro-optics
temperature
Crossover

Cite this

Sreenilayam, S. P. ; Rodriguez-Lojo, D. ; Panov, V. P. ; Swaminathan, V. ; Vij, J. K. ; Panarin, Yu P. ; Gorecka, E. ; Panov, A. ; Stevenson, P. J. / Design and investigation of de Vries liquid crystals based on 5-phenyl-pyrimidine and (R,R)-2,3-epoxyhexoxy backbone. In: Physical Review E. 2017 ; Vol. 96, No. 4.
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abstract = "Calamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The one involving a perfluorinated chain shows SmA∗ phase over a wide temperature range of 82 °C, whereas the siloxane analog exhibits both SmA∗ and SmC∗ phases over a broad range of temperatures, and a weak first-order SmA∗-SmC∗ transition is observed. For the siloxane analog, the reduction factor for the layer shrinkage R (relative to its thickness at the SmA∗-SmC∗ transition temperature, TAC) is ∼0.373, and layer shrinkage is 1.7{\%} at a temperature of 13 °C below the TAC. This compound is considered to have {"}de Vries smectic{"} characteristics with the de Vries coefficient CdeVries of ∼0.86 on the scale of zero (maximum-layer shrinkage) to 1 (zero-layer shrinkage). A three-parameter mean-field model is introduced for the orientational distribution function (ODF) to reproduce the electro-optic properties. This model explains the experimental results and leads to the ODF, which exhibits a crossover from the sugar-loaf to diffuse-cone ODF some 3 °C above TAC.",
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Sreenilayam, SP, Rodriguez-Lojo, D, Panov, VP, Swaminathan, V, Vij, JK, Panarin, YP, Gorecka, E, Panov, A & Stevenson, PJ 2017, 'Design and investigation of de Vries liquid crystals based on 5-phenyl-pyrimidine and (R,R)-2,3-epoxyhexoxy backbone', Physical Review E, vol. 96, no. 4, 042701. https://doi.org/10.1103/PhysRevE.96.042701

Design and investigation of de Vries liquid crystals based on 5-phenyl-pyrimidine and (R,R)-2,3-epoxyhexoxy backbone. / Sreenilayam, S. P.; Rodriguez-Lojo, D.; Panov, V. P.; Swaminathan, V.; Vij, J. K.; Panarin, Yu P.; Gorecka, E.; Panov, A.; Stevenson, P. J.

In: Physical Review E, Vol. 96, No. 4, 042701, 03.10.2017.

Research output: Contribution to journalArticle

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T1 - Design and investigation of de Vries liquid crystals based on 5-phenyl-pyrimidine and (R,R)-2,3-epoxyhexoxy backbone

AU - Sreenilayam, S. P.

AU - Rodriguez-Lojo, D.

AU - Panov, V. P.

AU - Swaminathan, V.

AU - Vij, J. K.

AU - Panarin, Yu P.

AU - Gorecka, E.

AU - Panov, A.

AU - Stevenson, P. J.

PY - 2017/10/3

Y1 - 2017/10/3

N2 - Calamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The one involving a perfluorinated chain shows SmA∗ phase over a wide temperature range of 82 °C, whereas the siloxane analog exhibits both SmA∗ and SmC∗ phases over a broad range of temperatures, and a weak first-order SmA∗-SmC∗ transition is observed. For the siloxane analog, the reduction factor for the layer shrinkage R (relative to its thickness at the SmA∗-SmC∗ transition temperature, TAC) is ∼0.373, and layer shrinkage is 1.7% at a temperature of 13 °C below the TAC. This compound is considered to have "de Vries smectic" characteristics with the de Vries coefficient CdeVries of ∼0.86 on the scale of zero (maximum-layer shrinkage) to 1 (zero-layer shrinkage). A three-parameter mean-field model is introduced for the orientational distribution function (ODF) to reproduce the electro-optic properties. This model explains the experimental results and leads to the ODF, which exhibits a crossover from the sugar-loaf to diffuse-cone ODF some 3 °C above TAC.

AB - Calamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The one involving a perfluorinated chain shows SmA∗ phase over a wide temperature range of 82 °C, whereas the siloxane analog exhibits both SmA∗ and SmC∗ phases over a broad range of temperatures, and a weak first-order SmA∗-SmC∗ transition is observed. For the siloxane analog, the reduction factor for the layer shrinkage R (relative to its thickness at the SmA∗-SmC∗ transition temperature, TAC) is ∼0.373, and layer shrinkage is 1.7% at a temperature of 13 °C below the TAC. This compound is considered to have "de Vries smectic" characteristics with the de Vries coefficient CdeVries of ∼0.86 on the scale of zero (maximum-layer shrinkage) to 1 (zero-layer shrinkage). A three-parameter mean-field model is introduced for the orientational distribution function (ODF) to reproduce the electro-optic properties. This model explains the experimental results and leads to the ODF, which exhibits a crossover from the sugar-loaf to diffuse-cone ODF some 3 °C above TAC.

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