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The influence of lateral fluorination and cyanation on the mesomorphism of polycatenar mesogens and the nature of the SmC phase therein

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The influence of lateral fluorination and cyanation on the mesomorphism of polycatenar mesogens and the nature of the SmC phase therein. / Smirnova, Antonina I.; Heinrich, Benoît; Donnio, Bertrand; Bruce, Duncan W.

In: RSC Advances, Vol. 5, No. 92, 27.08.2015, p. 75149-75159.

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Harvard

Smirnova, AI, Heinrich, B, Donnio, B & Bruce, DW 2015, 'The influence of lateral fluorination and cyanation on the mesomorphism of polycatenar mesogens and the nature of the SmC phase therein', RSC Advances, vol. 5, no. 92, pp. 75149-75159. https://doi.org/10.1039/c5ra17100h

APA

Smirnova, A. I., Heinrich, B., Donnio, B., & Bruce, D. W. (2015). The influence of lateral fluorination and cyanation on the mesomorphism of polycatenar mesogens and the nature of the SmC phase therein. RSC Advances, 5(92), 75149-75159. https://doi.org/10.1039/c5ra17100h

Vancouver

Smirnova AI, Heinrich B, Donnio B, Bruce DW. The influence of lateral fluorination and cyanation on the mesomorphism of polycatenar mesogens and the nature of the SmC phase therein. RSC Advances. 2015 Aug 27;5(92):75149-75159. https://doi.org/10.1039/c5ra17100h

Author

Smirnova, Antonina I. ; Heinrich, Benoît ; Donnio, Bertrand ; Bruce, Duncan W. / The influence of lateral fluorination and cyanation on the mesomorphism of polycatenar mesogens and the nature of the SmC phase therein. In: RSC Advances. 2015 ; Vol. 5, No. 92. pp. 75149-75159.

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@article{f06ce19a32514450973837afae34836d,
title = "The influence of lateral fluorination and cyanation on the mesomorphism of polycatenar mesogens and the nature of the SmC phase therein",
abstract = "Several series of tetracatenar mesogens having different lateral substituents (-F, -CN, -CF3) on the central phenylene ring of the molecule have been synthesised and their mesomorphic behaviour investigated by polarising microscopy, differential scanning calorimetry and small-angle X-ray scattering methods. The study offers an insight into the effect of different lateral polar functions on the mesomorphism of tetracatenar mesogens and starts to try to delineate polar and steric contributions. Thus -CF3 exerts a strong steric effect that destabilises more organised mesophases (SmC, ribbon) and reduces transition temperatures. Use of a central tetrafluorophenyl unit also destabilises organised phases in common with observations made in calamitic materials, but the use of only one or two lateral fluorines has relatively little effect on transition temperatures and mesomorphism. The more polar cyano function is different in that addition of one such group reduces transition temperatures and destabilises the nematic and crystal phases, whereas the more symmetric derivative with two cyano functions shows more stable crystal and mesophases. A detailed geometrical analysis supported by X-ray diffraction data (and a dilatometry data base) leads to the proposal of a model for the SmC-to-Colr phase transformation triggered by chain-induced layer undulations in the smectic phase.",
author = "Smirnova, {Antonina I.} and Beno{\^i}t Heinrich and Bertrand Donnio and Bruce, {Duncan W.}",
year = "2015",
month = "8",
day = "27",
doi = "10.1039/c5ra17100h",
language = "English",
volume = "5",
pages = "75149--75159",
journal = "AIP Advances",
issn = "2046-2069",
publisher = "The Royal Society of Chemistry",
number = "92",

}

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TY - JOUR

T1 - The influence of lateral fluorination and cyanation on the mesomorphism of polycatenar mesogens and the nature of the SmC phase therein

AU - Smirnova, Antonina I.

AU - Heinrich, Benoît

AU - Donnio, Bertrand

AU - Bruce, Duncan W.

PY - 2015/8/27

Y1 - 2015/8/27

N2 - Several series of tetracatenar mesogens having different lateral substituents (-F, -CN, -CF3) on the central phenylene ring of the molecule have been synthesised and their mesomorphic behaviour investigated by polarising microscopy, differential scanning calorimetry and small-angle X-ray scattering methods. The study offers an insight into the effect of different lateral polar functions on the mesomorphism of tetracatenar mesogens and starts to try to delineate polar and steric contributions. Thus -CF3 exerts a strong steric effect that destabilises more organised mesophases (SmC, ribbon) and reduces transition temperatures. Use of a central tetrafluorophenyl unit also destabilises organised phases in common with observations made in calamitic materials, but the use of only one or two lateral fluorines has relatively little effect on transition temperatures and mesomorphism. The more polar cyano function is different in that addition of one such group reduces transition temperatures and destabilises the nematic and crystal phases, whereas the more symmetric derivative with two cyano functions shows more stable crystal and mesophases. A detailed geometrical analysis supported by X-ray diffraction data (and a dilatometry data base) leads to the proposal of a model for the SmC-to-Colr phase transformation triggered by chain-induced layer undulations in the smectic phase.

AB - Several series of tetracatenar mesogens having different lateral substituents (-F, -CN, -CF3) on the central phenylene ring of the molecule have been synthesised and their mesomorphic behaviour investigated by polarising microscopy, differential scanning calorimetry and small-angle X-ray scattering methods. The study offers an insight into the effect of different lateral polar functions on the mesomorphism of tetracatenar mesogens and starts to try to delineate polar and steric contributions. Thus -CF3 exerts a strong steric effect that destabilises more organised mesophases (SmC, ribbon) and reduces transition temperatures. Use of a central tetrafluorophenyl unit also destabilises organised phases in common with observations made in calamitic materials, but the use of only one or two lateral fluorines has relatively little effect on transition temperatures and mesomorphism. The more polar cyano function is different in that addition of one such group reduces transition temperatures and destabilises the nematic and crystal phases, whereas the more symmetric derivative with two cyano functions shows more stable crystal and mesophases. A detailed geometrical analysis supported by X-ray diffraction data (and a dilatometry data base) leads to the proposal of a model for the SmC-to-Colr phase transformation triggered by chain-induced layer undulations in the smectic phase.

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U2 - 10.1039/c5ra17100h

DO - 10.1039/c5ra17100h

M3 - Article

VL - 5

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EP - 75159

JO - AIP Advances

JF - AIP Advances

SN - 2046-2069

IS - 92

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