Gas chromatographic study of the thermal and analytical properties of a nematic luquid crystal and its cupric complex

Abstract

Abstract The nematic compound N ‐4‐(2′‐(4″‐dodecyloxybenzoyloxy)‐4′‐do‐decyloxy)azobenzenyl‐4‐dodecyloxysalicylideneimine, known as LH, and its cupric complex, bis[ N ‐4‐(2′‐(4″‐dodecyloxybenzoyloxy)‐4′‐dodecyloxy)azobenzenyl‐4‐dodecyloxysalicylidene]iminato of copper (II), known as CuL 2 have been used as stationary phases for gas chromatography. The thermal properties of LH and CuL 2 have been determined with conventional metal columns, using n ‐alkanes as solute probes. Plots of In V 0 g against 1/ T clearly show the temperature transitions of LH and CuL 2 . The analytical capabilities of the two stationary phases were established by use of 25 m glass capillary columns. Satisfactory separations were obtained for positional hydrocarbon and halocarbon isomers, aromatic and polyaromatic compounds, and volatile essential oil constitutents.