Long-Range Chirality Transfer in Free Radical Polymerization of Bulky   Vinyl Monomers Containing Laterally Attached p-Terphenyl Groups

doi:10.1021/ma900879f

CORC > 北京大学 > 化学与分子工程学院

	Long-Range Chirality Transfer in Free Radical Polymerization of Bulky Vinyl Monomers Containing Laterally Attached p-Terphenyl Groups
	Cui, Jiaxi ; Lu, Xiaocun ; Liu, Anhua ; Wan, Xinhua ; Zhou, Qifeng
刊名	macromolecules
	2009
关键词	SENSE-SELECTIVE POLYMERIZATION MAIN-CHAIN CHIRALITY CHOLESTERIC LIQUID-CRYSTALS HANDED HELICAL CONFORMATION MACROMOLECULAR HELICITY CONJUGATED POLYMERS SIDE-CHAINS TWIST-SENSE CHIROPTICAL PROPERTIES PROMESOGENIC MONOMERS
DOI	10.1021/ma900879f
英文摘要	Two series of chiral bulky vinyl monomers, 2-(4'-hexyloxyphenyl)-5-(4'-alkoxycarbonylphenyl)styrene and 2-(4'-alkoxycarbonylphenyl)-5-(4'-hexyloxyphenyl)styrene (abbreviated as S-(+)-HexMm/ R-(-)-HexM0 and S-(+)-MmHex/R-(-)-M0Hex (m = 0, 1, 2, 3), respectively), were designed and synthesized. The former differed the latter only by the relative location of vinyl group, i.e., orientation against or toward the stereocenter. Except for S-(+)-HexM1 and S-(+)-HexM3, all the monomers readily underwent radical polymerization to yield the polymers displaying optical rotations and Cotton effects in the UV-vis absorption region of side groups distinct to the corresponding model compounds and mononmers, implying the formation of main chain chirality, most probable helicity. The influences of the configuration, the distance to p-terphenyl, and the position relative to vinyl group of stereocenter on the chiroptical properties of the resultant polymers were systematically studied. It wits found that inverting the absolute spatial configuration of asymmetric center or changing the parity of methylene number between stereocenter and p-terphenyl alternated the direction of optical rotation of polymer, similar to the odd-even alternation behavior observed in the cholesteric phase of achiral 2,5-bis(4'-hexyloxyphenyl)styrene doped with the corresponding monomers. This parallel indicated an identical driving force for the formation of chiral mesophase and the asymmetric secondary structure of the polymer. When the spatial configuration of stereocenter was Fixed, its distance to p-terphenyl rather than vinyl group played a dominant role in the induction of an excess helical sense. However, the stereogenic center at the ortho position of vinyl group exhibited a larger induction power than those at the meta position.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000270807300015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Polymer Science; SCI(E); EI; 45; ARTICLE; 20; 7678-7688; 42
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/151304]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Cui, Jiaxi,Lu, Xiaocun,Liu, Anhua,et al. Long-Range Chirality Transfer in Free Radical Polymerization of Bulky Vinyl Monomers Containing Laterally Attached p-Terphenyl Groups[J]. macromolecules,2009.
APA	Cui, Jiaxi,Lu, Xiaocun,Liu, Anhua,Wan, Xinhua,&Zhou, Qifeng.(2009).Long-Range Chirality Transfer in Free Radical Polymerization of Bulky Vinyl Monomers Containing Laterally Attached p-Terphenyl Groups.macromolecules.
MLA	Cui, Jiaxi,et al."Long-Range Chirality Transfer in Free Radical Polymerization of Bulky Vinyl Monomers Containing Laterally Attached p-Terphenyl Groups".macromolecules (2009).