Dilatometry of binary nematogenic mixtures. 4-Ethoxy-4'-pentanoyl- and 4-ethoxy-4'-nonanoyloxyazobenzene

Hecke, Gerald R. Van; Theodore, Louis

doi:10.1021/j100503a020

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Recently, this has been confirmed with statistical mechanical methods based on hard particle theories,' and experimentally with volume-temperature studies for a binary system of weekly polar mesogens. 8 Although several reports on mixing enthalpy (H')-composition studies in nonmesogen-NLC systems have been pub1ished,9-l3 studies for binary mixtures of mesogens have not been published up to now.…”

Section: Introductionmentioning

confidence: 99%

Enthalpies of Mixing in Binary Systems of Nematic Liquid Crystals

Churjusova

Sokolova

1992

Molecular Crystals and Liquid Crystals Science and Technology.

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The mixing enthalpies of binary mixtures of nematic liquid crystals are studied using a Calvet calorimeter. The systems studied are: 4-ethoxybenzylidene-4'-n-butylaniline-4-n-pentylphenyl-4'-methoxybenzoate and 4-n-butyl-4'-methoxyazoxybenzene-4-n-pentyl-4'-cyanobipheny~. In the second system the induced smectic A phase occurs in the medium concentration range.The results are discussed in terms of molecular properties and interactions.

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Section: Introductionmentioning

confidence: 99%

Enthalpies of Mixing in Binary Systems of Nematic Liquid Crystals

Churjusova

Sokolova

1992

Molecular Crystals and Liquid Crystals Science and Technology.

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EDA complex stability constants and formation enthalpies in a binary liquid crystalline system with induced smectic phase

Demus

Hauser

Pelzl

et al. 1985

Cryst. Res. Technol.

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LII t h e birrary systeiii 4,4'-bis-[n-l~utyla1iii~io]-biphenyl/4-(Z,Z-dicyano-et~ie1~~ l)-plieiiyl 4-11-nonyloxybenzoate which due to EDA coniplex formation exhibits a n induced SA phase, nieasurernents o f t h e charge transfer band, the molar voluniina and transition enthalpies were done. By t h e concentration a n d teniperature dependence, resp., of t h e charge transfer absorption and t h e strongly negative excess voluinina we estimated t h e stability constant and t h e foriiiation enthalpy of t h e coniplex.The d a t a obtained by the two independent iiiethods agree sufficiently. J in biniiren System 4,4'-Bis-[n-but~lainino]-biphenyl/4-n-N01~yloxyl;eii~~~~ii~ire-[4-(2,2-tlicyan-ethenyl)-phenylester], welches infolge EDA-Kornplexbildung eine induzierte SA-l'hase zeigt, wurden die Charge-Transfer-Rande, Molvolumina und Umwantllungsenthalpien gemessen. Aus der Konzentrations-bzw. Temperaturabhangigkeit der ChargeTransfer-Absorption und der stark negativen XxzeBvolumina ermittelten wir die Stabilitatskonstante und die Bildungsenthalpie des Komplexes. Die aus den beiden unabhangigen Methotlen erhaltenen Werte stirninen hinreichend iiherein.

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