Circular Dichroism of Optically Active Poly(dialkylsilane) Aggregates in Microcapsules

Terao, Ken; Kikuchi, Noriaki; Sato, Takahiro; Teramoto, Akio; Fujiki, Michiya; Dobashi, Toshiaki

doi:https://doi.org/10.1021/la060810+

Circular Dichroism of Optically Active Poly(dialkylsilane) Aggregates in Microcapsules

Terao, Ken; Kikuchi, Noriaki; Sato, Takahiro et al.

Langmuir, 2006, 22(19), 7975-7980

Number of Access:767（2026-05-10 00:46 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/81828

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Title	Circular Dichroism of Optically Active Poly(dialkylsilane) Aggregates in Microcapsules
Creator	NRID 1000060334132 1000060334132 ORCID 0000-0001-7363-4491 0000-0001-7363-4491 researchmap permalink kenterao kenterao Scopus Author ID 7101653015 7101653015 CreatorName Terao, Ken
	CreatorName Kikuchi, Noriaki
	NRID 1000010196248 1000010196248 CreatorName Sato, Takahiro
	CreatorName Teramoto, Akio
	NRID 1000000346313 1000000346313 CreatorName Fujiki, Michiya
	NRID 1000030155626 1000030155626 CreatorName Dobashi, Toshiaki
Description	Terao K., Kikuchi N., Sato S., et al. Circular Dichroism of Optically Active Poly(dialkylsilane) Aggregates in Microcapsules. Langmuir, 22(19), 7975-7980, August 10, 2006. Copyright © 2006, American Chemical Society. https://doi.org/10.1021/la060810+.
Abstract	Poly[n-hexyl-(S)-3-methylpentylsilane] aggregates confined in microcapsules to keep the aggregation number and ranging in average polymer mass mp in a microcapsule from 2 × 10-16 to 2 × 10-14 g were studied by circular dichroism measurements in ethanol (a nonsolvent) and tetrahydrofuran (an associative solvent at low temperature) at various temperatures. The weight-average molecular weight Mw and the polydispersity index (the ratio of Mw to the number-average molecular weight) of the polysilane sample were 6.6 × 104 and 1.07, respectively, and the average number of polymer molecules in each capsule was estimated to be 1.9 × 103 for mp = 2 × 10-16 g and 1.7 × 105 for mp = 2 × 10-14 g. The size of each aggregate did not affect the optical activity because the circular dichroism thus obtained was proportional to mp under the same conditions in the investigated mp range; on the other hand, the peak height of the circular dichroism in tetrahydrofuran had a significant hysteresis between 0 and 25 °C. Moreover, the circular dichroism appreciably reflected the prepared method, that is, the temperature and solvent; in other words, the aggregates memorized the initial conditions in their stacking structures. © 2006 American Chemical Society.
Publisher	American Chemical Society
Source Title	Langmuir
Volume (Issue)	22(19)
Page	7975-7980
Date of Issued	2006-08-10
Language	English
Handle URL	https://hdl.handle.net/11094/81828
PISSN	07437463
NCID	AA10461730
Relation.isVersionOf	DOI (Publisher Version) https://doi.org/10.1021/la060810+
Access Rights	open access
CopyRight	This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/la060810+.
oaire:version	Accepted Manuscript
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Langmuir. 2006, 22(19), p. 7975-7980
DC.title	Circular Dichroism of Optically Active Poly(dialkylsilane) Aggregates in Microcapsules
DC.creator	Terao, Ken
	Kikuchi, Noriaki
	Sato, Takahiro
	Teramoto, Akio
	Fujiki, Michiya
	Dobashi, Toshiaki
DC.publisher	American Chemical Society
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2006-08-10
DC.identifier	https://doi.org/10.1021/la060810+
DC.description	Terao K., Kikuchi N., Sato S., et al. Circular Dichroism of Optically Active Poly(dialkylsilane) Aggregates in Microcapsules. Langmuir, 22(19), 7975-7980, August 10, 2006. Copyright © 2006, American Chemical Society. https://doi.org/10.1021/la060810+.
DCTERMS.abstract	Poly[n-hexyl-(S)-3-methylpentylsilane] aggregates confined in microcapsules to keep the aggregation number and ranging in average polymer mass mp in a microcapsule from 2 × 10-16 to 2 × 10-14 g were studied by circular dichroism measurements in ethanol (a nonsolvent) and tetrahydrofuran (an associative solvent at low temperature) at various temperatures. The weight-average molecular weight Mw and the polydispersity index (the ratio of Mw to the number-average molecular weight) of the polysilane sample were 6.6 × 104 and 1.07, respectively, and the average number of polymer molecules in each capsule was estimated to be 1.9 × 103 for mp = 2 × 10-16 g and 1.7 × 105 for mp = 2 × 10-14 g. The size of each aggregate did not affect the optical activity because the circular dichroism thus obtained was proportional to mp under the same conditions in the investigated mp range; on the other hand, the peak height of the circular dichroism in tetrahydrofuran had a significant hysteresis between 0 and 25 °C. Moreover, the circular dichroism appreciably reflected the prepared method, that is, the temperature and solvent; in other words, the aggregates memorized the initial conditions in their stacking structures. © 2006 American Chemical Society.
DC.rights	This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/la060810+.
DC.format	81828
citation_title	Circular Dichroism of Optically Active Poly(dialkylsilane) Aggregates in Microcapsules
citation_author	Terao, Ken
	Kikuchi, Noriaki
	Sato, Takahiro
	Teramoto, Akio
	Fujiki, Michiya
	Dobashi, Toshiaki
citation_publisher	American Chemical Society
citation_language	English
citation_date	2006-08-10
citation_journal_title	Langmuir
citation_volume	22
citation_issue	19
citation_firstpage	7975
citation_lastpage	7980
citation_doi	https://doi.org/10.1021/la060810+
citation_public_url	https://hdl.handle.net/11094/81828

Circular Dichroism of Optically Active Poly(dialkylsilane) Aggregates in Microcapsules

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