Thermotropic phase behavior of trialkyl cyclohexanetriamides

I. Tomatsu; C.F.C. Fitié; D. Byelov; W.H. Jeu, de; P.C.M.M. Magusin; M. Wübbenhorst; R.P. Sijbesma

doi:10.1021/jp9072685

Thermotropic phase behavior of trialkyl cyclohexanetriamides

I. Tomatsu, C.F.C. Fitié, D. Byelov, W.H. Jeu, de, P.C.M.M. Magusin, M. Wübbenhorst, R.P. Sijbesma

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Abstract

The thermotropic phase behavior of symmetric cyclohexanetriamides carrying various linear and branched alkyl chains was investigated using calorimetry, microscopy, solid-state NMR, dielectric relaxation spectroscopy, and X-ray scattering techniques. Cyclohexanetriamides carrying C6 or longer linear alkyl chains formed columnar plastic phases with a pseudocentered rectangular lattice. Those with C8 or longer alkyl chain also showed a nematic liquid crystalline phase. Cyclohexanetriamides carrying branched octyl chains displayed columnar phases with rectangular lattices, except for the triamide with the highly branched tetramethylbutyl group. The occurrence of less symmetrical columnar phases is ascribed to the mode of stacking of cyclohexanetriamides which leads to noncylindrical columns. Dielectric relaxation spectra also featured highly cooperative relaxation processes related to reorientation of the macrodipolar columns in the mesophase, showing the potential of these molecules as building blocks in responsive materials.

Original language	English
Pages (from-to)	14158-14164
Journal	Journal of Physical Chemistry B
Volume	113
Issue number	43
DOIs	https://doi.org/10.1021/jp9072685
Publication status	Published - 2009

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title = "Thermotropic phase behavior of trialkyl cyclohexanetriamides",

abstract = "The thermotropic phase behavior of symmetric cyclohexanetriamides carrying various linear and branched alkyl chains was investigated using calorimetry, microscopy, solid-state NMR, dielectric relaxation spectroscopy, and X-ray scattering techniques. Cyclohexanetriamides carrying C6 or longer linear alkyl chains formed columnar plastic phases with a pseudocentered rectangular lattice. Those with C8 or longer alkyl chain also showed a nematic liquid crystalline phase. Cyclohexanetriamides carrying branched octyl chains displayed columnar phases with rectangular lattices, except for the triamide with the highly branched tetramethylbutyl group. The occurrence of less symmetrical columnar phases is ascribed to the mode of stacking of cyclohexanetriamides which leads to noncylindrical columns. Dielectric relaxation spectra also featured highly cooperative relaxation processes related to reorientation of the macrodipolar columns in the mesophase, showing the potential of these molecules as building blocks in responsive materials.",

author = "I. Tomatsu and C.F.C. Fiti{\'e} and D. Byelov and {Jeu, de}, W.H. and P.C.M.M. Magusin and M. W{\"u}bbenhorst and R.P. Sijbesma",

year = "2009",

doi = "10.1021/jp9072685",

language = "English",

volume = "113",

pages = "14158--14164",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Thermotropic phase behavior of trialkyl cyclohexanetriamides

AU - Tomatsu, I.

AU - Fitié, C.F.C.

AU - Byelov, D.

AU - Jeu, de, W.H.

AU - Magusin, P.C.M.M.

AU - Wübbenhorst, M.

AU - Sijbesma, R.P.

PY - 2009

Y1 - 2009

N2 - The thermotropic phase behavior of symmetric cyclohexanetriamides carrying various linear and branched alkyl chains was investigated using calorimetry, microscopy, solid-state NMR, dielectric relaxation spectroscopy, and X-ray scattering techniques. Cyclohexanetriamides carrying C6 or longer linear alkyl chains formed columnar plastic phases with a pseudocentered rectangular lattice. Those with C8 or longer alkyl chain also showed a nematic liquid crystalline phase. Cyclohexanetriamides carrying branched octyl chains displayed columnar phases with rectangular lattices, except for the triamide with the highly branched tetramethylbutyl group. The occurrence of less symmetrical columnar phases is ascribed to the mode of stacking of cyclohexanetriamides which leads to noncylindrical columns. Dielectric relaxation spectra also featured highly cooperative relaxation processes related to reorientation of the macrodipolar columns in the mesophase, showing the potential of these molecules as building blocks in responsive materials.

AB - The thermotropic phase behavior of symmetric cyclohexanetriamides carrying various linear and branched alkyl chains was investigated using calorimetry, microscopy, solid-state NMR, dielectric relaxation spectroscopy, and X-ray scattering techniques. Cyclohexanetriamides carrying C6 or longer linear alkyl chains formed columnar plastic phases with a pseudocentered rectangular lattice. Those with C8 or longer alkyl chain also showed a nematic liquid crystalline phase. Cyclohexanetriamides carrying branched octyl chains displayed columnar phases with rectangular lattices, except for the triamide with the highly branched tetramethylbutyl group. The occurrence of less symmetrical columnar phases is ascribed to the mode of stacking of cyclohexanetriamides which leads to noncylindrical columns. Dielectric relaxation spectra also featured highly cooperative relaxation processes related to reorientation of the macrodipolar columns in the mesophase, showing the potential of these molecules as building blocks in responsive materials.

U2 - 10.1021/jp9072685

DO - 10.1021/jp9072685

M3 - Article

C2 - 19845404

SN - 1520-6106

VL - 113

SP - 14158

EP - 14164

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

IS - 43

ER -

Thermotropic phase behavior of trialkyl cyclohexanetriamides

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