Zeitschrift für Naturforschung B · 1997 · 25 citations · 0 references
Natural SciencesChemistryMaterials ScienceCrystal StructureOrganic ChemistrySolid-state ChemistryCrystal ChemistryCrystal SymmetryCrystallization ProcessesCrystallographyLiquid Crystal MaterialsLiquid CrystalsChiral Nematic PhaseLiquid Crystal Phase BehaviorNematic Liquid CrystalsOrganic CrystalsSmectic Liquid CrystalsSmectic PhasesThiadiazole ChemistryThiazole Chemistry
The synthesis and mesomorphic behaviour of new series of liquid crystals containing 1,3,4- thiadiazole and thiophene rings with azo central bond are reported (series 5a and 5b). All compounds of series 5a exhibit enantiotropic nematic mesophase and the higher homologues (n = 9 - 10) also show a monotropic smectic C phase. Series 5b show dimorphism S C - N (for n = 5 - 7 the S C is monotropic). These series are compared with the Schiff’s bases analogues, the imine bond gives rise to similar liquid crystals phase but larger mesomorphic range.