Elastic and Optical Properties of Some 4′-<i>n</i>-Alkyl-4-Cyanobiphenyls

Karat, P. P.; Madhusudana, N. V.

doi:10.1080/00268947608084830

Cited by 279 publications

(43 citation statements)

References 14 publications

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“…5 for dye 2 mixed with both liquid crystals, can be connected with the odd-even effect. Such effect was found for the nematic-isotropic transition temperature and other physical properties of some homologous series of liquid crystals [12,[33][34][35][36] and was explained as the alteration of interaction between alkyl chains [37]. For molecules of liquid crystals with alkoxy chain, the opposite behaviour to that for molecules with alkyl chain should be predicted, as the presence of the oxygen atom causes a change in the alignment alteration of the carbon atoms in the chain.…”

Section: Resultsmentioning

confidence: 97%

Oriental behaviour of some homologues of 4-n-pentyl-phenylthio-4′-n-alkoxybenzoate doped with dichroic dye

Bauman

Zięba

Mykowska

2008

Opto-Electronics Review

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The long-range orientational order of three members of 4-n-pentylphenylthio-4′-n-alkoxybenzoate $$ (\bar nS5) $$ series doped with a dichroic dye was studied by means of electronic absorption and fluorescence measurements. The order parameters <P2> and <P4> as well as the orientational distribution function were determined on the basis of absorption and emission spectra of linearly polarized light recorded as a function of temperature in the nematic, smectic A, and smectic C phases. An influence of the dye molecular structure on the orientational order of the dye/liquid crystal mixture was observed. Moreover, the dependence of the order parameter values on the length of the alkoxy chain in liquid crystal molecules was found. It was shown that the order parameter <P4>, obtained from fluorescence measurements, can be helpful in recognizing the second-order or weakly first-order transitions between various liquid crystalline phases.

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Section: Resultsmentioning

confidence: 97%

Oriental behaviour of some homologues of 4-n-pentyl-phenylthio-4′-n-alkoxybenzoate doped with dichroic dye

Bauman

Zięba

Mykowska

2008

Opto-Electronics Review

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“…As the number of carbon rises, the effect becomes progressively smaller, which can be simply explained in terms of the increasing flexibility of the end chain [39]. Such alternation of S was also observed for other homologous series of liquid crystals [34,37,39]. The order parameter of dye III behaves differently.…”

Section: Order Parametermentioning

confidence: 84%

“…It is well known that most macroscopic parameters of homologous series of liquid crystals show the odd-even effect [21,[32][33][34][35][36][37][38], which was explained as the alternation of interaction between alkyl chains [39]. From Fig.…”

Section: Order Parametermentioning

confidence: 99%

Guest-Host Interactions in Nematic p-Cyano-p'-Alkylphenylcyclohexanes

1994

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Studies of the temperature dependence of the guest order parameter for binary mixtures of the dichroic azo dye in the homologous series of the p-cyano-p'-alkylphenylcyclohexane were performed. Odd-even effect for the order parameter value was observed. A correlation between the shift in the nematic-isotropic transition temperature after dye addition and the orientation of the guest molecules in the nematic host was discussed.

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“…Previously it was found that the nematic-isotropic transition temperature and other physical properties of some homologous series show the odd-even effect [29][30][31][32]. Such behaviour was explained as the alteration of interaction between alkyl chains [33].…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of Orientational Order of Some Liquid Crystals from Various Homologous Series

et al. 2006

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The long-range orientational order of liquid crystals from homologous series of 4-n-alkyl-4 -cyanobiphenyl, 4-n-alkoxy-4 -cyanobiphenyl, trans-4-n-alkyl(4 -cyano-phenyl)-hexane, and 4-(trans-4 -n-alkylcyclohexyl)--isothiocyanato-benzene was studied by means of classical methods of optical spectroscopy: absorption of the polarized light, fluorescence depolarization, and Raman scattering depolarization. The absorption, emission, and Raman scattering spectra of linearly polarized light were recorded as a function of temperature in the whole range of the mesophase. On the basis of these spectra the order parameters P2 and P4 as well as the orientational distribution function were determined. The results obtained for members of various series with the same number of carbon atom in the alkyl chain were compared. It was found that the orientational order of liquid crystal molecules depends on the structure of the rigid core, on the kind of the terminal group as well as on the alkyl chain length. The odd-even effect for the order parameters, explained as the alteration of interaction between alkyl chains, was observed.

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Elastic and Optical Properties of Some 4′-n-Alkyl-4-Cyanobiphenyls

Cited by 279 publications

References 14 publications

Oriental behaviour of some homologues of 4-n-pentyl-phenylthio-4′-n-alkoxybenzoate doped with dichroic dye

Oriental behaviour of some homologues of 4-n-pentyl-phenylthio-4′-n-alkoxybenzoate doped with dichroic dye

Guest-Host Interactions in Nematic p-Cyano-p'-Alkylphenylcyclohexanes

Comparative Study of Orientational Order of Some Liquid Crystals from Various Homologous Series

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