NDLI: Enthalpy-Entropy Compensation and Solubility Parameters for Solutions of Nonmesomorphic Solutes in the Smectic-A, Nematic and Isotropic Phases of the Liquid Crystal p-n-octyl-p′-cyanobiphenyl

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Enthalpy-Entropy Compensation and Solubility Parameters for Solutions of Nonmesomorphic Solutes in the Smectic-A, Nematic and Isotropic Phases of the Liquid Crystal p-n-octyl-p′-cyanobiphenyl

Content Provider	Springer Nature Link
Author	Oweimreen, G. A.
Copyright Year	2010
Abstract	Ratios of infinite dilution solute activity coefficients ( $\gamma_{2}^{\infty} )$ for nonmesomorphic solutes at the smectic-A-to-nematic ( $\gamma_{2,\mathrm{SA}}^{\infty}/\gamma_{2,\mathrm{N}}^{\infty} )$ and the nematic-to-isotropic ( $\gamma_{2,\mathrm{N} '}^{\infty} /\gamma_{2,\mathrm{I}}^{\infty} )$ phase transition temperatures, $T_{\mathrm{S}\mbox{\scriptsize--}\mathrm{N}}$ and $T_{\mathrm{N} \mathrm{'}\mbox{\scriptsize--}\mathrm{I}}$ respectively, of p-n-octyl-p′-cyanobiphenyl (8CB) show that the solutes are more soluble in the isotropic phase than in the smectic-A and nematic phases where they exhibit a nearly equal solubility. The Flory-Huggins size effect correction ( $\gamma_{\mathrm{F}\mbox{\scriptsize--}\mathrm{H}}^{\infty} )$ , and the thermal ( $\gamma_{\mathrm{T}}^{\infty} )$ and athermal ( $\gamma_{\mathrm{I}\mbox{\scriptsize--}\mathrm{S}}^{\infty} )$ contributions to $\gamma_{2}^{\infty}$ , are evaluated. Solute partial molar enthalpies (Δ$_{solv}$ H) and entropies (Δ$_{solv}$ S) of solvation show a compensation effect that reflects a delicate interplay between solute-solvent interactions and size and structure effects. Both the solute and solvent solubility parameters, δ $_{2}$ and δ $_{1}$ respectively, decrease as temperature increases. Additionally the δ $_{1}$ values undergo a discontinuous increase at $T_{\mathrm{S}\mbox{\scriptsize--}\mathrm{N}}$ attributed to the disappearance of the layered structure of the Smectic-A phase and a discontinuous decrease at $T_{\mathrm{N}'\mbox{\scriptsize--}\mathrm{I}}$ attributed to an increase in the flexibility of the alkyl tails of the liquid crystal molecules in the nematic phase. Evidence that hints at the effect of the structure of the liquid crystal solvent on the solution process is presented.
Starting Page	79
Ending Page	92
Page Count	14
File Format	PDF
ISSN	00959782
Journal	Journal of Solution Chemistry
Volume Number	40
Issue Number	1
e-ISSN	15728927
Language	English
Publisher	Springer US
Publisher Date	2010-11-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Enthalpy-entropy compensation Liquid crystal solvents Nonmesomorphic solutes Solubility parameters Condensed Matter Physics Inorganic Chemistry Oceanography Geochemistry Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Molecular Biology Biophysics Physical and Theoretical Chemistry

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