# Crystallization kinetics of (S)-4'-(1-methylheptyloxycarbonyl)biphenyl-4-yl 4-\[4-(2,2,3,3,4,4,4-heptafluorobutoxy)but-1-oxy\]-2-fluorobenzoate

Source: [Crystallization kinetics of (S)-4'-(1-methylheptyloxycarbonyl)biphenyl-4-yl 4-\[4-(2,2,3,3,4,4,4-heptafluorobutoxy)but-1-oxy\]-2-fluorobenzoate](<https://www.sota2.com/research/paper/68fa46ae1e209131ce92241c>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-27T04:29:08.381Z

Authors: Aleksandra Deptuch, Sebastian Lalik, Ma{\\l}gorzata Jasiurkowska-Delaporte, Magdalena Urba\\'nska, Monika Marzec

Published: 2023-12-18T10:22:45.000Z

## Abstract

Chiral liquid crystalline compounds belonging to the homologous series of (S)-4'-(1-methylheptyloxycarbonyl)biphenyl-4-yl 4-\[m-(2,2,3,3,4,4,4-heptafluorobutoxy)alk-1-oxy\]-2-fluorobenzoates show various behavior on cooling depending on the length of the CmH2m chain. The homologue with m = 2 crystallizes, while for m = 5, 6, 7, and presumably also for m = 3, the glass of the anticlinic smectic CA\* phase is formed. The previous results for m = 4 suggest that this homologue may also be a glassformer. This paper presents the study of the crystallization kinetics for the compound with m = 4 in isothermal conditions (by polarizing optical microscopy) and for the 5-40 K/min cooling rates (by differential scanning calorimetry). Microscopic observations enable estimation of the energy barrier for nucleation, which equals 409 kJ/mol. The threshold cooling rate necessary for complete vitrification of the smectic CA\* phase, obtained by extrapolating the enthalpy change during crystallization to zero, is equal to 81 K/min or 64 K/min for the linear and parabolic fit, respectively. The structural studies by X-ray diffraction show that crystal phases have lamellar structures both in the pristine sample and after crystallization from the melt but with different layer spacing. A weak relaxation process is detected in the sample after melt crystallization, revealing the presence of the conformational disorder. The dynamic glass transition temperature of the SmCA\* phase, estimated from the relaxation time of the PH process (as the {\\alpha}-relaxation time could not be registered in a wide enough temperature range), is 244 K.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2312.11082>)

[PDF](<https://arxiv.org/pdf/2312.11082.pdf>)