Alkyl substituent-dependent systematic change in cold crystallization of azo molecules

Honda, Akinori; Hibi, Yukie; Matsumoto, K; Kawai, Masato; Miyamura, Kazuo

doi:10.1039/d2ra00942k

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…The fluorine‐containing compound BBT‐F demonstrated an exothermic peak at 85 °C that was identified as a cold crystallization process, suggesting fast crystallization of BBT‐F at elevated temperature. The reasons for this phenomenon might be attributed to the mobility of molecules fragments [ 19 ] that induce enhanced phase separation between alkyl side chains and conjugated fluorine‐loaded backbone. Obviously, fluorine atoms change the molecular mobility and, according to DSC results, provide stronger intermolecular interactions.…”

Section: Resultsmentioning

confidence: 99%

Improving Charge Mobilities of Novel Push–Pull Small Molecules through Thermally Induced Self‐Ordering

Sideltsev

Piryazev

Akhkiamova

et al. 2023

Physica Rapid Research Ltrs

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The conjugated small molecules (CSMs) are an interesting class of semiconductor materials for thin‐film electronics. Herein, the synthesis of two novel donor–acceptor small molecules BBT‐H and BBT‐F is reported and the impact of morphology rearrangement upon thermal annealing on hole‐transport characteristics of thin films based on them is investigated. It is shown that morphological changes occurring upon annealing of thin films based on fluorine‐containing molecule BBT‐F result in spectacular enhancement of hole mobilities by seven times from 2.13 × 10−4 to 1.52 × 10−3 cm2V−1 s−1, whereas hole mobilities of nonfluorinated BBT‐H do not show any considerable changing. This effect features the importance of molecular engineering for the design of promising CSMs for next‐generation thin‐film electronics.

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Section: Resultsmentioning

confidence: 99%

Improving Charge Mobilities of Novel Push–Pull Small Molecules through Thermally Induced Self‐Ordering

Sideltsev

Piryazev

Akhkiamova

et al. 2023

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

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Toward flame retardants or thermal stabilizers with new mechanism for polymers

et al. 2023

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Effect of Alkyl Chain Length on the Phase Situation of Glass-Forming Liquid Crystals

et al. 2022

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The phase behaviour of the latest synthesised compound belonging to a family of (S)-4′-(1-methyloctyloxycarbonyl) biphenyl-4-yl 4-[‘m’-(2,2,3,3,4,4,4-heptafluorobutoxy) ‘m’alkoxy]-benzoates (where ‘m’ means 3, 5 or 7 methylene groups) is described by polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction and Fourier-transform infrared absorption spectroscopy. It has been shown that as the length of the alkyl chain increases, a given liquid crystal possesses a greater number of mesophases and at a higher temperature it goes into the isotropic liquid phase. All examined compounds form a chiral smectic phase with antiferroelectric properties (SmCA* phase), in which the temperature range of occurrence increases with the length of the molecule. The number of methylene groups also affects the glass transition. The compound with the shortest alkyl chain (‘m’ = 3) is vitrified from the conformationally disordered crystal phase. For the compound with five -CH2- groups (‘m’ = 5), a glass transition from the monotropic high-order hexatic smectic SmXA* phase is observed. In the case of the liquid crystal with the longest carbon chain (‘m’ = 7), the vitrification from the less ordered SmCA* phase is visible. Differences in the crystallization kinetics, e.g., the nucleation-controlled mechanism for the compound with the shortest carbon chain vs. the complex phenomenon for its longer homologs, are discussed.

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Alkyl substituent-dependent systematic change in cold crystallization of azo molecules

Abstract: The change in alkyl substitution position and alkyl chain length of azo molecules led to the variation in cold crystallization behavior.

Cited by 3 publications

References 43 publications

Improving Charge Mobilities of Novel Push–Pull Small Molecules through Thermally Induced Self‐Ordering

Improving Charge Mobilities of Novel Push–Pull Small Molecules through Thermally Induced Self‐Ordering

Toward flame retardants or thermal stabilizers with new mechanism for polymers

Effect of Alkyl Chain Length on the Phase Situation of Glass-Forming Liquid Crystals

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