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The effect of temperature and concentration of the added electrolyte tetrabutylammoniumpicrate on the electric conductivity of homologous 4,4′-di-n-alkoxyazoxybenzenes (C 1  to C 8 ) in their nematic phase is investigated. In general an increase of the alkyl chain length results in a decrease of the ratio of anisotropy x ∥ /x ⊥ . At the lowest temperature of the nematic phase values between 1,6 (C 2 ) and 0,45 (C 8 ) are obtained. This behaviour can be explained by the formation of cybotactic groups with a smectic structure. Increasing the electrolyte concentration reduces the ratio of anisotropy for short alkyl chains, whereas for long chains the ratio rapidly increases.

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Untersuchungen der elektrischen Leitfähigkeit homologer 4,4′-Di-n-alkyloxy-azoxybenzole im nematischen Phasenbereich / Investigation of the Electric Conductivity of Homologous 4,4′-Di-n-alkoxyazoxybenzenes in their Nematic Phase