Helical structures of N-alkylated poly(p-benzamide)s

Nagao Kobayashi; Atsuya Muranaka; Aya Tanatani; Akihiro Yokoyama; Isao Azumaya; Motoo Shiro; Masanobu Uchiyama; Tsutomu Yokozawa

Helical structures of N-alkylated poly(p-benzamide)s

Nagao Kobayashi, Atsuya Muranaka, Aya Tanatani, Akihiro Yokoyama, Isao Azumaya, Motoo Shiro, Masanobu Uchiyama, Tsutomu Yokozawa

SCI - Chemistry

Research output: Contribution to conference › Paper › peer-review

Abstract

The helical structure of poly(p-benzamide)s (1) bearing a chiral side chain on the nitrogen atom was investigated by UV and CD spectroscopy. The polymers exhibited bisignate CD and much larger compared with the corresponding monomer (2). By applying the coupled oscillator analysis in conjunction with TDDFT calculations, the positive and negative CD signals observed at 300 and 260 nm, respectively, could be assigned to the exciton band arising from the couplings of the long-axis polarized transition of each 4-(alkylamino)benzoyl chromophore. Taking into account the Rosenfeld equation, we assigned the helical sense of the polymers to be right-handed ((P)-helix).

Original language	English
Pages	2800-2801
Number of pages	2
Publication status	Published - 2005 Dec 1
Event	54th SPSJ Symposium on Macromolecules - Yamagata, Japan Duration: 2005 Sep 20 → 2005 Sep 22

Other

Other	54th SPSJ Symposium on Macromolecules
Country/Territory	Japan
City	Yamagata
Period	05/9/20 → 05/9/22

Keywords

Benzamide
Circular dichroism
Helical structures

ASJC Scopus subject areas

Engineering(all)

Cite this

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title = "Helical structures of N-alkylated poly(p-benzamide)s",

abstract = "The helical structure of poly(p-benzamide)s (1) bearing a chiral side chain on the nitrogen atom was investigated by UV and CD spectroscopy. The polymers exhibited bisignate CD and much larger compared with the corresponding monomer (2). By applying the coupled oscillator analysis in conjunction with TDDFT calculations, the positive and negative CD signals observed at 300 and 260 nm, respectively, could be assigned to the exciton band arising from the couplings of the long-axis polarized transition of each 4-(alkylamino)benzoyl chromophore. Taking into account the Rosenfeld equation, we assigned the helical sense of the polymers to be right-handed ((P)-helix).",

keywords = "Benzamide, Circular dichroism, Helical structures",

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T1 - Helical structures of N-alkylated poly(p-benzamide)s

AU - Kobayashi, Nagao

AU - Muranaka, Atsuya

AU - Tanatani, Aya

AU - Yokoyama, Akihiro

AU - Azumaya, Isao

AU - Shiro, Motoo

AU - Uchiyama, Masanobu

AU - Yokozawa, Tsutomu

PY - 2005/12/1

Y1 - 2005/12/1

N2 - The helical structure of poly(p-benzamide)s (1) bearing a chiral side chain on the nitrogen atom was investigated by UV and CD spectroscopy. The polymers exhibited bisignate CD and much larger compared with the corresponding monomer (2). By applying the coupled oscillator analysis in conjunction with TDDFT calculations, the positive and negative CD signals observed at 300 and 260 nm, respectively, could be assigned to the exciton band arising from the couplings of the long-axis polarized transition of each 4-(alkylamino)benzoyl chromophore. Taking into account the Rosenfeld equation, we assigned the helical sense of the polymers to be right-handed ((P)-helix).

AB - The helical structure of poly(p-benzamide)s (1) bearing a chiral side chain on the nitrogen atom was investigated by UV and CD spectroscopy. The polymers exhibited bisignate CD and much larger compared with the corresponding monomer (2). By applying the coupled oscillator analysis in conjunction with TDDFT calculations, the positive and negative CD signals observed at 300 and 260 nm, respectively, could be assigned to the exciton band arising from the couplings of the long-axis polarized transition of each 4-(alkylamino)benzoyl chromophore. Taking into account the Rosenfeld equation, we assigned the helical sense of the polymers to be right-handed ((P)-helix).

KW - Benzamide

KW - Circular dichroism

KW - Helical structures

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M3 - Paper

AN - SCOPUS:33645558735

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T2 - 54th SPSJ Symposium on Macromolecules

Y2 - 20 September 2005 through 22 September 2005

ER -

Helical structures of N-alkylated poly(p-benzamide)s

Abstract

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Keywords

ASJC Scopus subject areas

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