Crystal structure and mesogenic behaviour of a new fluorene derivative: 9,9-dimethyl-2,7-bis(4-pentylphenyl)-9H-fluorene

The title com­pound, C37H42, is a new mesogenic com­pound containing the fluorene moiety. It exhibits enanti­otropic nematic liquid crystalline behaviour with melting at 125 °C and isotropization at 175 °C. The crystallographically independent unit contains two mol­ecules oriented face-to-edge with respect to each other. The two mol­ecules have nearly the same conformation of the bis-phenyl fluorene moiety. The mol­ecular packing in the crystal phase is nematic-like.