Molecular dynamics of branched hexaalkyl hexa-peri-hexabenzocoronenes

M. M. Elmahdy; G. Floudas; M. Kastler; K. Müllen

doi:10.1088/0953-8984/20/24/244105

Molecular dynamics of branched hexaalkyl hexa-peri-hexabenzocoronenes

M. M. Elmahdy, G. Floudas, M. Kastler, K. Müllen

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Abstract

The molecular dynamics of discotic liquid crystalline hexa-peri- hexabenzocoronenes (HBC-C_10,6 and HBC-C_14,10) with long alkyl side chains branched in close vicinity to the HBC aromatic core were studied by dielectric spectroscopy. The two compounds display a weak dipolar relaxation (α-process) manifested by a Vogel-Fulcher-Tammann (VFT) dependence and have almost the same glass temperature (∼215 K) in excellent agreement with the value from differential scanning calorimetry. The origin of this process is the freezing of the in-plane disc rotation. Controlled experiments revealed that the weak dipole moment associated with the α-process is due to oxidation.

Original language	English
Article number	244105
Journal	Journal of Physics Condensed Matter
Volume	20
Issue number	24
DOIs	https://doi.org/10.1088/0953-8984/20/24/244105
State	Published - 18 Jun 2008
Externally published	Yes

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title = "Molecular dynamics of branched hexaalkyl hexa-peri-hexabenzocoronenes",

abstract = "The molecular dynamics of discotic liquid crystalline hexa-peri- hexabenzocoronenes (HBC-C10,6 and HBC-C14,10) with long alkyl side chains branched in close vicinity to the HBC aromatic core were studied by dielectric spectroscopy. The two compounds display a weak dipolar relaxation (α-process) manifested by a Vogel-Fulcher-Tammann (VFT) dependence and have almost the same glass temperature (∼215 K) in excellent agreement with the value from differential scanning calorimetry. The origin of this process is the freezing of the in-plane disc rotation. Controlled experiments revealed that the weak dipole moment associated with the α-process is due to oxidation.",

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AU - Elmahdy, M. M.

AU - Floudas, G.

AU - Kastler, M.

AU - Müllen, K.

PY - 2008/6/18

Y1 - 2008/6/18

N2 - The molecular dynamics of discotic liquid crystalline hexa-peri- hexabenzocoronenes (HBC-C10,6 and HBC-C14,10) with long alkyl side chains branched in close vicinity to the HBC aromatic core were studied by dielectric spectroscopy. The two compounds display a weak dipolar relaxation (α-process) manifested by a Vogel-Fulcher-Tammann (VFT) dependence and have almost the same glass temperature (∼215 K) in excellent agreement with the value from differential scanning calorimetry. The origin of this process is the freezing of the in-plane disc rotation. Controlled experiments revealed that the weak dipole moment associated with the α-process is due to oxidation.

AB - The molecular dynamics of discotic liquid crystalline hexa-peri- hexabenzocoronenes (HBC-C10,6 and HBC-C14,10) with long alkyl side chains branched in close vicinity to the HBC aromatic core were studied by dielectric spectroscopy. The two compounds display a weak dipolar relaxation (α-process) manifested by a Vogel-Fulcher-Tammann (VFT) dependence and have almost the same glass temperature (∼215 K) in excellent agreement with the value from differential scanning calorimetry. The origin of this process is the freezing of the in-plane disc rotation. Controlled experiments revealed that the weak dipole moment associated with the α-process is due to oxidation.

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JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

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ER -

Molecular dynamics of branched hexaalkyl hexa-peri-hexabenzocoronenes

Abstract

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