MESOGENIC PROPERTIES OF (4''-ALKOXYPHENYL)-3'-OXO-1'-PROPENYLAMINO]PROPANE

The properties of compounds incorporating three mesogenic cores linked to a central 1,2,3-trisubstituted propane unit are reported. They for m S-A and S-C calamitic liquid crystalline phases with a layer spacing in the orthogonal smectic phase significantly smaller than a single m olecular length. The mesogenic properties of related molecules with tw o mesogenic cores depend on the position of the enaminoketone ring wit h respect to the joint. Intramolecular dipolar interactions of the ena minoketone rings are suggested as being responsible for the hindered f rmation of the trans-conformational structure of the cores in the dime ric molecules.