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Abstract
The X-ray investigation of a binary mixture of two homologues of 2-(4-alkoxyben-zylideneamino)fluorenones [dodecyloxy and tridecyloxy derivatives, abbreviated as FLNOC12 and FLNOC13, respectively] and pure compounds FLNOC12, FLNOC13 has been carried out. It has been clarified that the reentrant smectic A phase in the mixture has a partially bilayer structure in contrast with the higher temperature smectic A phase, where the layer spacing is nearly equal to the average molecular length. The reentrant smectic A phase is found to be induced by the molecular association and by the destabilization mechanism of the smectic C structure.
