"Bicontinuous cubic" liquid crystalline materials from discotic molecules: A special effect of paraffinic side chains with ionic liquid pendants

Md Akhtarul Alam; Jin Motoyanagi; Yohei Yamamoto; Takanori Fukushima; Jungeun Kim; Kenichi Kato; Masaki Takata; Akinori Saeki; Shu Seki; Seiichi Tagawa; Takuzo Aida

doi:10.1021/ja905373d

"Bicontinuous cubic" liquid crystalline materials from discotic molecules: A special effect of paraffinic side chains with ionic liquid pendants

Md Akhtarul Alam, Jin Motoyanagi, Yohei Yamamoto, Takanori Fukushima, Jungeun Kim, Kenichi Kato, Masaki Takata, Akinori Saeki, Shu Seki, Seiichi Tagawa, Takuzo Aida

Research output: Contribution to journal › Article › peer-review

88 Citations (Scopus)

Abstract

(Chemical Equation Presented) Triphenylene (TP) derivatives bearing appropriate paraffinic side chains with imidazolium ion-based ionic liquid (IL) pendants were unveiled to display a phase diagram with liquid crystalline (LC) mesophases of bicontinuous cubic (Cub_bi) and hexagonal columnar (Col_h) geometries. While their phase transition behaviors are highly dependent on the length of the side chains and the size of the ionic liquid pendants, TPs with hexadecyl side chains exclusively form a Cub_bi LC assembly over an extremely wide temperature range of ∼200°C from room temperature when the anions of the IL pendants are relatively small. Wide-angle X-ray diffraction analysis suggested that the Cub_bi LC mesophase contains D-stacked columnar TP arrays with a plane-to-plane separation of ∼3.5 Å. Consistently, upon laser flash photolysis, it showed a transient microwave conductivity comparable to that of a Col_h LC reference.

Original language	English
Pages (from-to)	17722-17723
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	131
Issue number	49
DOIs	https://doi.org/10.1021/ja905373d
Publication status	Published - 2009 Dec 16
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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Alam, M. A., Motoyanagi, J., Yamamoto, Y., Fukushima, T., Kim, J., Kato, K., Takata, M., Saeki, A., Seki, S., Tagawa, S., & Aida, T. (2009). "Bicontinuous cubic" liquid crystalline materials from discotic molecules: A special effect of paraffinic side chains with ionic liquid pendants. Journal of the American Chemical Society, 131(49), 17722-17723. https://doi.org/10.1021/ja905373d

Alam, MA, Motoyanagi, J, Yamamoto, Y, Fukushima, T, Kim, J, Kato, K, Takata, M, Saeki, A, Seki, S, Tagawa, S & Aida, T 2009, '"Bicontinuous cubic" liquid crystalline materials from discotic molecules: A special effect of paraffinic side chains with ionic liquid pendants', Journal of the American Chemical Society, vol. 131, no. 49, pp. 17722-17723. https://doi.org/10.1021/ja905373d

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abstract = "(Chemical Equation Presented) Triphenylene (TP) derivatives bearing appropriate paraffinic side chains with imidazolium ion-based ionic liquid (IL) pendants were unveiled to display a phase diagram with liquid crystalline (LC) mesophases of bicontinuous cubic (Cubbi) and hexagonal columnar (Colh) geometries. While their phase transition behaviors are highly dependent on the length of the side chains and the size of the ionic liquid pendants, TPs with hexadecyl side chains exclusively form a Cubbi LC assembly over an extremely wide temperature range of ∼200°C from room temperature when the anions of the IL pendants are relatively small. Wide-angle X-ray diffraction analysis suggested that the Cubbi LC mesophase contains D-stacked columnar TP arrays with a plane-to-plane separation of ∼3.5 {\AA}. Consistently, upon laser flash photolysis, it showed a transient microwave conductivity comparable to that of a Colh LC reference.",

author = "Alam, {Md Akhtarul} and Jin Motoyanagi and Yohei Yamamoto and Takanori Fukushima and Jungeun Kim and Kenichi Kato and Masaki Takata and Akinori Saeki and Shu Seki and Seiichi Tagawa and Takuzo Aida",

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AU - Alam, Md Akhtarul

AU - Motoyanagi, Jin

AU - Yamamoto, Yohei

AU - Fukushima, Takanori

AU - Kim, Jungeun

AU - Kato, Kenichi

AU - Takata, Masaki

AU - Saeki, Akinori

AU - Seki, Shu

AU - Tagawa, Seiichi

AU - Aida, Takuzo

PY - 2009/12/16

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N2 - (Chemical Equation Presented) Triphenylene (TP) derivatives bearing appropriate paraffinic side chains with imidazolium ion-based ionic liquid (IL) pendants were unveiled to display a phase diagram with liquid crystalline (LC) mesophases of bicontinuous cubic (Cubbi) and hexagonal columnar (Colh) geometries. While their phase transition behaviors are highly dependent on the length of the side chains and the size of the ionic liquid pendants, TPs with hexadecyl side chains exclusively form a Cubbi LC assembly over an extremely wide temperature range of ∼200°C from room temperature when the anions of the IL pendants are relatively small. Wide-angle X-ray diffraction analysis suggested that the Cubbi LC mesophase contains D-stacked columnar TP arrays with a plane-to-plane separation of ∼3.5 Å. Consistently, upon laser flash photolysis, it showed a transient microwave conductivity comparable to that of a Colh LC reference.

AB - (Chemical Equation Presented) Triphenylene (TP) derivatives bearing appropriate paraffinic side chains with imidazolium ion-based ionic liquid (IL) pendants were unveiled to display a phase diagram with liquid crystalline (LC) mesophases of bicontinuous cubic (Cubbi) and hexagonal columnar (Colh) geometries. While their phase transition behaviors are highly dependent on the length of the side chains and the size of the ionic liquid pendants, TPs with hexadecyl side chains exclusively form a Cubbi LC assembly over an extremely wide temperature range of ∼200°C from room temperature when the anions of the IL pendants are relatively small. Wide-angle X-ray diffraction analysis suggested that the Cubbi LC mesophase contains D-stacked columnar TP arrays with a plane-to-plane separation of ∼3.5 Å. Consistently, upon laser flash photolysis, it showed a transient microwave conductivity comparable to that of a Colh LC reference.

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"Bicontinuous cubic" liquid crystalline materials from discotic molecules: A special effect of paraffinic side chains with ionic liquid pendants

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