The 1-(trans-4′-n-Alkylcyclohexyl)-2-(4”-cyanophenyl)ethanes— A New Series of Stable Nematogens of Positive Dielectric Anisotropy

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Abstract
The synthesis and some important properties of the l-(trans-4′-n-alkylcyclohexyl)-2-(4”-cyanophenyl)ethanes—where n-alkyl = C 1 to C 7—are described. These stable low melting materials have excellent properties comparable in many ways with those of the PCH materials wherein the cyclohexyl and phenyl rings are directly linked. The properties of the new series of materials, which we propose should be called the PECH compounds, are further elaborated in a companion paper by Raynes, et al, also presented at the Bangalore conference. In that paper it is made clear that the PECH materials have in fact higher order parameters and give superior order parameters for dissolved dyes compared with the PCH materials. The PECH compounds are therefore significant new nematogens to be considered for use in both twisted nematic and cholesteric-nematic dyed phase change displays.