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Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Phys. Chem. B 2012, 116, 30, 9255-9260
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Calorimetric and Spectroscopic Evidence of Chain-Melting in Smectic E and Smectic A Phases of 4-Alkyl-4′-isothiocyanatobiphenyl (nTCB)

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† Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
§ The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Kraków 31-342, Poland
∥ Institute of Physics, Jagiellonian University, Reymonta 4, Kraków 30-059, Poland
*Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan. E-mail: [email protected]
Cite this: J. Phys. Chem. B 2012, 116, 30, 9255–9260
Publication Date (Web):July 5, 2012
https://doi.org/10.1021/jp303972s
Copyright © 2012 American Chemical Society
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Abstract

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To confirm the molten state of the alkyl chain in soft crystalline phase, smectic E (SmE) phase, thermodynamic and spectroscopic analyses were performed on 4-n-alkyl-4′-isothiocyanatobiphenyl (nTCB, n: the number of carbon atoms in the alkyl group). DSC results of 11TCB and 12TCB, having extra smectic A phase besides smectic E phase, show that their chain-length dependence of entropies of transition (ΔtrsS) from the ordered crystalline (OC) phase to the SmE phase matches the trend found for nTCB (n = 4–10), while no chain-length dependence is observed in ΔtrsS at the SmE-to-SmA and SmA-to-isotropic liquid (IL) phase transitions in 11TCB and 12TCB. Temperature dependences of FT-IR spectra of six compounds (n = 2, 3, 5, 8, 10, and 12) were recorded. The CH stretching modes of the chain exhibited more pronounced change at the transition from the OC to the SmE phase than at the transition from the SmE phase to the IL or SmA phase. These results indicate that the alkyl chain is molten in the SmE phase as in IL. The disordering process of nTCB molecules from the OC to IL via anisotropic mesophases is discussed in terms of entropy.

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Optimized Cartesian coordinates of all atoms and molecular vibrational frequencies of 8TCB, 10TCB, and 12TCB, and graphical representation of temperature dependence of IR spectra of 12TCB in the whole spectral range and of nTCB (n = 2, 3, 5, and 10) in the CH stretching region of alkyl group. This material is available free of charge via the Internet at http://pubs.acs.org.

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