X-Ray Diffraction Study on Discotic Lamellar Phase in Bis(1,3-di(p-n-alkoxyphenyl)propane-1,3-dionato)copper(II)

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Abstract
X-ray diffraction measurements have been carried out on bis(1,3-di(p-n-alkoxyphenyl)propane-1,3-dionato)copper(II) to clarify the detailed structural properties on the discotic mesophase. It is confirmed that the lamellar structure is realized in the discotic phase and the tilt angle of molecules to the layer is about 5°. The crystal-to-discotic phase transition occurs involving a large fluctuation of the inter-molecular distance along normal to the molecular plane within the layer. On the other hand, the transition from the discotic-to-isotropic liquid phase is characterized by the destabilization of the layer structure due to the randomizing of both the position and the orientation of molecules.