The free porphyrin 2,3,7,8,12,13,17,18-octakis (octylthio)tetraazaporphyrin (H2P8) and its copper (II) complex (CuP8) have been synthesized and studied by UV-VIS spectroscopy, calorimetric and X-ray analysis. The calorimetric analysis, as well the optical observations, indicate for CuP8 the existence of a liquid—crystalline mesophase between 67.6 and 151.7°c. The mesophase is characterized by X-ray diffraction at 81°C as discotic with an hexagonal arrangement of the columns. The stacking periodicity along the axes of the columns is ≈ 4.1 Å, with a tilt angle of molecular planes estimated to be about 30°.
Discotic mesomorphism of the 2,3,7,8,12,13,17,18-octakis- (octylthio) tetraazaporphyrin copper (II) complex
RICCIARDI, Giampaolo;
1991-01-01
Abstract
The free porphyrin 2,3,7,8,12,13,17,18-octakis (octylthio)tetraazaporphyrin (H2P8) and its copper (II) complex (CuP8) have been synthesized and studied by UV-VIS spectroscopy, calorimetric and X-ray analysis. The calorimetric analysis, as well the optical observations, indicate for CuP8 the existence of a liquid—crystalline mesophase between 67.6 and 151.7°c. The mesophase is characterized by X-ray diffraction at 81°C as discotic with an hexagonal arrangement of the columns. The stacking periodicity along the axes of the columns is ≈ 4.1 Å, with a tilt angle of molecular planes estimated to be about 30°.File in questo prodotto:
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