Liquid crystalline octasubstituted lead(ii) phthalocyanines: Effects of alkoxy and alkylthio substituents on film alignment and electrical properties
Octasubstituted lead(ii) phthalocyanines containing alkylthio- and alkoxy- groups in peripheral positions have been synthesized and characterized using 1H and 13C NMR, UV-Vis, IR and mass spectroscopies as well as elemental analysis. The mesogenic properties of the octasubstituted lead(ii) phthalocyanines have been investigated by differential scanning calorimetry, polarizing optical microscopy, and X-ray diffraction. The sandwich structures ITO/PbPc/In were prepared to investigate the J(V) characteristics of thin films of these molecules. The dissimilar behavior of the films before and after heat-treatment is expected to result in changing the alignment inside the columnar stacking of the molecules in the films.
Physicochemical characterization of octakis(alkyloxy)-substituted Zn(II)-phthalocyanines non-covalently incorporated into an organogel and their remarkable morphological effect on the nanoscale-fibers
A series of octakis(alkyloxy)-substituted Zn(II)-phthalocyanines were efficiently incorporated into an organogel made of (1R,2R)-trans-1,2- bis(dodecanoylamino)cyclohexane by means of multiple cooperative non-covalent interactions, and SEM revealed the fo
Diaz Diaz, David,Torres, Tomas,Zentel, Rudolf,Davis, Riju,Brehmer, Martin
p. 2369 - 2371
(2008/02/12)
Control of the Discotic to Isotropic Transition in Alkoxy-Substituted Silicondihydroxo-Phthalocyanines by Axial Substituents
The synthesis of a homologous series of octaalkoxy-substituted silicondihydroxo-phthalocyanines is described.The mesomorphic properties of these new materials were studied by DSC, optical microscopy and X-ray investigations.Compounds with n >/= 4 (n is the number of carbon atoms in a single alkoxy side chain) show a discotic mesophase transition.A transition to the isotropic state is only observed when n >/= 8.X-ray diffraction patterns of the mesophases confirm that all compounds form a hexagonal columnar mesophase of the type Dhd.
Sauer, Thomas,Wegner, Gerhard
p. 97 - 118
(2007/10/02)
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