Investigation of 4′-n-alkyl-4-cyanobiphenyls structure features by IR spectroscopy methods

Babkov, L. M.; Gnatyuk, I. I.; Trukhachev, S. V.

doi:10.1016/j.molstruc.2005.01.035

Cited by 19 publications

(7 citation statements)

References 9 publications

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“…Herein analogous investigations are made for 4CB. They complement results and conclusions obtained previously [2][3][4][5] for other members of the homologous series nCB.…”

supporting

confidence: 90%

“…The phase transition into a nematic liquid crystal occurs upon cooling liquid 4CB to T = 16. The conformational fluxionality and intermolecular interaction in nCB for n = 2, 5, 8, and 9 have been investigated by IR spectroscopy [2][3][4][5]. Spectra of these compounds were measured over a broad temperature range in the crystalline, liquid-crystalline, and liquid phases.…”

mentioning

confidence: 99%

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IR spectra temperature changes and conformational structure of 4-butyl-4′-cyanobiphenyl

et al. 2009

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UDC 535. 34:539.196.3 IR spectra of 4-butyl-4′-cyanobiphenyl in the liquid and solid-crystal states were measured in the 400-4000 cm -1 region at 28-70 o C. Changes of the spectra as a function of temperature are due to the conformational fluxionality of the molecules according to calculated IR spectra of the possible 4-butyl-4′-cyanobiphenyl conformers. Calculations were carried out using the method of fragments and the LEV-100 program package. Bands sensitive to the conformational changes in the molecular structure were found. IR spectra have been interpreted. Conclusions have been made about the conformations of the sample in the solid-crystal and liquid phases.

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“…Herein analogous investigations are made for 4CB. They complement results and conclusions obtained previously [2][3][4][5] for other members of the homologous series nCB.…”

supporting

confidence: 90%

mentioning

confidence: 99%

IR spectra temperature changes and conformational structure of 4-butyl-4′-cyanobiphenyl

et al. 2009

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“…лiчних сполук (5CB, МББА) [6][7][8][9]. Коливальна спектроскопiя може бути корисною для визначення молекулярних конформацiй у рiзних фазових станах та параметрiв порядку, отримання iнформацiї про особливостi мiжмолекулярної взаємодiї та динамiки [10][11][12].…”

Section: вступunclassified

Коливальний Спектр Р-Амілоксібензиліден-Р-Толуідіну В Кристалічній Фазі

Pogorelov¹,

Bukalo²,

Жовтобрюх³

2022

Ukr. J. Phys.

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У роботі виконано аналіз коливального раманівського спектра рідкого кристала p-амілоксібензиліден-p-толуідіну (АБТ).Спектр КРС було зареєстровано в інтервалі 0–1650 cм–1 за кімнатної температури T = 293 К, коли АБТ перебуває у кристалічнійфазі. Проведено квантово-хімічне комп'ютерне моделювання геометрії та розрахунок теоретичних коливальних частот молекули АБТ методом B3LYP/6-31G(d, p). На основі результатів комп'ютерного моделювання виконано інтерпретацію експериментального спектра КРС, отримано конформаційні параметри молекули для кристалічного стану.

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“…For the photothermal studies, a 4-octyl-4 0 -cyanobiphenyl (8CB) liquid crystal sample with well-characterized and rich phase behavior [26][27][28] is chosen. The C-H scissoring band has a characteristic peak at 1607 cm −1 that is targeted in the following experiments.…”

mentioning

confidence: 99%

Vibrational mid-infrared photothermal spectroscopy using a fiber laser probe: asymptotic limit in signal-to-baseline contrast

et al. 2015

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We report on a mid-infrared photothermal spectroscopy system with a near-infrared fiber probe laser and a tunable quantum cascade pump laser. Photothermal spectra of a 6 μm-thick 4-octyl-4^'-cyanobiphenyl liquid crystal sample are measured with a signal-to-baseline contrast above 10³. As both the peak photothermal signal and the corresponding baseline increase linearly with probe power, the signal-to-baseline contrast converges to an asymptotic limit for a given pump power. This limit is independent of the probe power and characterizes the best contrast achievable for the system. This enables sensitive quantitative spectral characterization of linear infrared absorption features directly from photothermal spectroscopy measurements.

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Investigation of 4′-n-alkyl-4-cyanobiphenyls structure features by IR spectroscopy methods

Cited by 19 publications

References 9 publications

IR spectra temperature changes and conformational structure of 4-butyl-4′-cyanobiphenyl

IR spectra temperature changes and conformational structure of 4-butyl-4′-cyanobiphenyl

Коливальний Спектр Р-Амілоксібензиліден-Р-Толуідіну В Кристалічній Фазі

Vibrational mid-infrared photothermal spectroscopy using a fiber laser probe: asymptotic limit in signal-to-baseline contrast

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