ComparativeAnalysis of Fluorine-Containing MesogenicDerivatives of Carborane, Bicyclo[2.2.2]octane, Cyclohexane, and Benzeneusing the Maier–Meier Theory.

Two series of related three-ringnematoges with Δε> 0 and containing 12-vetex carborane (A), 10-vertexcarborane (B), bicyclo[2.2.2]octane (C),cyclohexane (D) and benzene (E) were preparedand investigated as additives to 6-CHBT nematic host and in the pureform (series 2). Dielectric results were analyzed withthe Maier–Meier relationship to gain an understanding of behaviorof additives in nematic solutions. Molecular parameters for each nematogenwere obtained at the B3LYP/6-31G(d,p) level of theory in the host’sdielectric medium, and dielectric data was used as the only experimentalparameter to calculate apparent order parameter Sappand the Kirkwood factor g. The resultsdemonstrated that compounds in series 1stabilize thenematic phase (high Sapp) of the hostmore than additives in series 2(low Sapp), and carbocycles Cand Dare more effective (higher Sapp) thancarborane analogues Aand B(lower Sapp). The method provides insight into behaviorof additives in nematic solutions and is useful for comparative analysisof a series of compounds or a series of hosts. [ABSTRACT FROM AUTHOR]