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Título

New 1,2,4- and 1,3,4-oxadiazole materials: synthesis, and mesomorphic and luminescence properties.

AutorParra, M. L.; Hidalgo, P.; Carrasco, E.; Barberá, Joaquín; Silvino, L.
Fecha de publicaciónago-2006
CitaciónLiquid Crystals 33(8): 875 - 882 (2006)
ResumenThe synthesis and liquid crystalline properties of new series of 1,2,4- and 1,3,4-oxadiazole derivatives (2a-f and 5a-f respectively) are reported. These compounds contain only one terminal flexible alkoxy chain, the other terminal substituent is a protecting benzyl group. All compounds of series 2 exhibit an enantiotropic nematic phase. The homologue with the longest chain (2f) displays an enantiotropic dimorphism smectic A- nematic. None of the compounds of series 5 shows mesomorphism and only crystal-isotropic transitions were observed. The liquid crystalline properties were investigated by differential scanning calorimetry, polarizing optical microscopy and X-ray measurements. Luminescence properties, in chloroform solution, of 2f and the series 5 compounds were evaluated. Good photoluminescence quantum yields for compounds of series 5 were observed. Compound 2f, incorporating the 1,2,4-oxadiazole ring shows a very strong reduction in emissive properties.
Versión del editorhttp://dx.doi.org/10.1080/02678290600871614
URIhttp://hdl.handle.net/10261/19653
DOI10.1080/02678290600871614
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