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The dipentyl derivatives of 10- and 12-vertex p-carboranes and bicyclo[2.2.2]octane have been prepared and studied in the pure state and in binary mixtures with a nematic host. Only 1,4-dipentylbicyclo[2.2.2]octane was found to exhibit a monotropic nematic transition. The extrapolated virtual nematic-isotropic transition temperatures provide the expected order of ring effectiveness in supporting the nematic mesophase: bicyclo[2.2.2]octane>12-vertex p-carborane >10-vertex p-carborane. The results for the single ring derivatives [1]b were compared with clearing temperatures for the two-ring mesogens [2]c.
