Metallomesogens derived from chelating schiffs bases containing 1,3,4-oxadiazole and 1,3,4-thiadiazole: Synthesis, characterization and study of mesomorphic properties

MARIA PARRA ^[1] ; SILVIA HERNÁNDEZ ^[1] ; JOEL ALDERETE ^[1]
1. [1] Universidad de Concepción
  
  Universidad de Concepción
  
  Comuna de Concepción, Chile
Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 48, Nº. 1, 2003, págs. 57-60
Idioma: inglés
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Resumen
- The preparation of copper (II) and palladium (II) complexes derived from ligands of Schiffs bases (L¹, L², L³, L4) incorporating 1,3,4-oxadiazole and 1,3,4-thiadiazole rings are reported. The thermal behaviour of the complexes was characterized by DSC, TGA and polarizing optical microscopy. Only the complexes derived from Schiff`s base L¹ display liquid crystalline properties. The complexes Ic and IIc, exhibit an enantiotropic smectic C phase, whereas the complexes IIa and IIb display dimorphism smectic C-nematic