Investigation of glass transition and polymorphism of smectogenic, partially fluorinated chiral compound by X-ray diffraction and infra-red spectroscopy

Deptuch, Aleksandra; Górska, Natalia; Baran, Stanisław; Urbańska, Magdalena

doi:10.1016/j.molliq.2024.125001

Journal of Molecular Liquids

2024

DOI: 10.1016/j.molliq.2024.125001

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Investigation of glass transition and polymorphism of smectogenic, partially fluorinated chiral compound by X-ray diffraction and infra-red spectroscopy

Aleksandra Deptuch,

Natalia Górska,

Stanisław Baran

et al.

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Synthesis and Characterization of New Chiral Smectic Four-Ring Esters

Urbańska,

Gratzke,

Czerwiński

2024

Molecules

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Orthoconic antiferroelectric liquid crystals (OAFLCs) represent unique self-organized materials with significant potential for applications in photonic devices due to their sub-microsecond switching times and high optical contrast in electro-optical effects. However, almost all known OALFCs suffer from low chemical stability and short helical pitch values. This paper presents the synthesis and study results of two chiral AFLCs, featuring a four-ring structure in the rigid core and high chemical stability. The mesomorphic properties of these compounds were investigated using polarizing optical microscopy and differential scanning calorimetry. Spectrometry and electro-optical studies were employed to estimate the helical pitch, tilt angle, and spontaneous polarization of the synthesized compounds and the prepared mixtures. All studied compounds exhibit enantiotropic chiral smectic mesophases including the SmA*, the SmC*, and a very broad temperature range of the SmCA* phase. Doping top-modern antiferroelectric mixture with synthesized compounds offers benefits such as increased helical pitch and tilt angle values without significantly influencing spontaneous polarization. This allows the prepared mixture to be regarded as an OAFLC with high optical contrast, characterized by an almost perfect dark state. These valuable physicochemical and optical properties suggest significant potential of studied materials for practical applications.

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Synthesis and Characterization of New Chiral Smectic Four-Ring Esters

Urbańska,

Gratzke,

Czerwiński

2024

Molecules

View full text Add to dashboard Cite

show abstract

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Investigation of glass transition and polymorphism of smectogenic, partially fluorinated chiral compound by X-ray diffraction and infra-red spectroscopy

Cited by 1 publication

References 40 publications

Synthesis and Characterization of New Chiral Smectic Four-Ring Esters

Synthesis and Characterization of New Chiral Smectic Four-Ring Esters

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