Stereoregular configuration and higher order structure of liquid crystalline polyacetylene derivatives

Iino, Kiyoshi; Goto, Hiromasa; Akagi, Kazuo; Shirakawa, Hideki; Kawaguchi, Akiyoshi

doi:10.1016/s0379-6779(96)04233-6

Cited by 18 publications

(15 citation statements)

References 3 publications

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“…These spectroscopic features suggest the existence of molecular interaction under equilibrium, probably due to a charge transfer reaction between the polyacetylene derivative and the iodine dopant. The results of the present experiment are consistent with the results of Masuda and Higashimura, who evaluated the formation of the charge transfer-type complex of polyphenylacetylene with low molecular weight electron acceptors, such as dichlorodicyanoquinone (DDQ), 7,7',8,, bromine, and antimony pentachloride [8].…”

Section: Gas-phase Dopingsupporting

confidence: 89%

“…This absorption band is thus considered to be due to a C-H out-of-plane deformation vibration of the trans polyene main-chain. The LC-substituted acetylene monomers approaching catalytically active sites are polymerized via a sequence of head-to-head and tail-to-tail linkages, yielding the stereoregular cis form [7]. The cis form is a kinetic product and hence upon heating is converted to the thermodynamic trans form.…”

Section: Liquid Crystallinity and Cis-trans Isomerizationmentioning

confidence: 99%

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Synthesis and properties of mono-substituted liquid crystalline polyacetylene derivatives—doping, magnetic orientation, and photo-isomerization

2005

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Mono-substituted acetylene monomers with a liquid crystalline (LC) group are polymerized using rhodium, iron or molybdenum complex catalysts. LC polyacetylene derivatives with number-averaged molecular weights of 4000-330000 were obtained in 5-92% yield. The LC behavior is examined by X-ray diffraction, differential scanning calorimetry, and polarizing optical microscopy. The polymers prepared using rhodium or iron catalyst are confirmed to assume a cis form and to undergo an irreversible isomerization to the trans form upon heating. Photo-responsive polyacetylene derivatives are successfully synthesized through the introduction of an azobenzene moiety as a mesogenic core into the side-chain, and these forms exhibit a reversible photochemical cis-to-trans isomerization of the azobenzene moiety.3

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Section: Gas-phase Dopingsupporting

confidence: 89%

Section: Liquid Crystallinity and Cis-trans Isomerizationmentioning

confidence: 99%

Synthesis and properties of mono-substituted liquid crystalline polyacetylene derivatives—doping, magnetic orientation, and photo-isomerization

2005

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“…4), suggesting that the liquid crystalline phase being a smectic state. 13,14 Diffraction angles of these peaks are evaluated 49.04 and 4.72 Å, respectively. These values well correspond to an interlayer distance of layered structure of the smectic A phase and a distance between side chains, which are estimated by molecular mechanics calculations 15 based on a decameric oligomer of 2a.…”

Section: Structure and Properties Of Poly(n-substituted Pyrrole)smentioning

confidence: 99%

Syntheses and properties of liquid crystalline N-substituted pyrroles and their polymers

Kijima¹,

Hasegawa²,

Shirakawa³

1998

J. Polym. Sci. A Polym. Chem.

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Three liquid crystalline N‐substituted pyrroles were synthesized from 6‐(1‐pyrrolyl)hexanol with phenolic derivatives having a mesogenic core of cyclohexylbenzene or biphenyl by Mitsunobu reaction. These pyrroles had two anodic peaks at 1.4 and 1.8 V (vs. SCE). The former was due to an oxidation of the pyrrole moiety and the latter was due to an oxidation of the mesogenic moiety. These pyrrole monomers were polymerized by electrochemical and chemical methods. The potentiostatic method and the chemical method using FeCl3 gave a soluble and fusible polymer, respectively. A polymer having a mesogenic core of cyclohexyl benzene obtained by the chemical method and a polymer having a mesogenic core of biphenylketone obtained by the potentiostatic method had a liquid‐crystalline phase. The phase was identified as smectic A by polarizing microscopy and XRD analysis. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 2691–2698, 1998

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“…These values well correspond to an inter-layer distance and a side chain distance of smectic liquid crystalline structure. [9] The assignments were supported by molecular mechanics calculations based on finite systems of the PAB403A polymers, as discussed below.…”

Section: °Cmentioning

confidence: 96%

Photo-Responsible Liquid Crystalline Conducting Polymers.

Akagi¹,

Goto

Fujita

et al. 1997

J. Photopol. Sci. Technol.

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Stereoregular configuration and higher order structure of liquid crystalline polyacetylene derivatives

Cited by 18 publications

References 3 publications

Synthesis and properties of mono-substituted liquid crystalline polyacetylene derivatives—doping, magnetic orientation, and photo-isomerization

Synthesis and properties of mono-substituted liquid crystalline polyacetylene derivatives—doping, magnetic orientation, and photo-isomerization

Syntheses and properties of liquid crystalline N-substituted pyrroles and their polymers

Photo-Responsible Liquid Crystalline Conducting Polymers.

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