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• W2012173615 startingPage "8519" @default.
• W2012173615 abstract "We synthesized novel axially chiral binaphthyl derivatives with highly twisting powers by substituting phenylcyclohexyl (PCH) mesogenic moieties into 2,2‘ positions or 2,2‘,6,6‘ positions of binaphthyl rings. The di- and tetrasubstituted binaphthyl derivatives, abbreviated as D-1 and D-2, respectively, were adopted as chiral dopants to induce chiral nematic liquid crystals (N*-LCs) available for synthesis of helical polyacetylene. The helical twisting power (βM) of D-2 was 449 μm-1, which was ca. 2.6 times larger than that of D-1 (171 μm-1). We prepared two kinds of induced N*-LCs with 5 μm and 270 nm in helical pitch by adding the chiral dopants D-1 and D-2 into the host N-LCs, respectively. The helical polyacetylene synthesized in the N*-LC containing D-2 exhibited highly screwed fibrils, but not a bundle of fibrils. This result is in quite contrast to the usual fibril morphology, where the screwed fibrils are gathered to form the bundle of fibrils, as observed in the helical polyacetylene synthesized in the N*-LC containing a chiral dopant with moderate helical twisting power, such as D-1. It is of keen interest that the helical pitch (270 nm) of the N*-LC including D-2 is much smaller than the diameter (ca. 1 μm) of the bundle of fibrils, which should depress the formation of the bundle of fibrils. The morphology free from the bundle of fibrils might enable us to evaluate more precisely intrinsic electromagnetic properties of a single screwed fibril of helical polyacetylene." @default.
• W2012173615 created "2016-06-24" @default.
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• W2012173615 date "2007-06-19" @default.
• W2012173615 modified "2023-10-13" @default.
• W2012173615 title "Highly Twisted Helical Polyacetylene with Morphology Free From the Bundle of Fibrils Synthesized in Chiral Nematic Liquid Crystal Reaction Field" @default.
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• W2012173615 doi "https://doi.org/10.1021/ja070701x" @default.
• W2012173615 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17579404" @default.
• W2012173615 hasPublicationYear "2007" @default.
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