Liquid crystalline octasubstituted lead(ii) phthalocyanines: effects of alkoxy and alkylthio substituents on film alignment and electrical properties?

New Journal of Chemistry Pub Date: 2012-06-13 DOI: 10.1039/C2NJ40247E

Abstract

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.

Graphical abstract: Liquid crystalline octasubstituted lead(ii) phthalocyanines: effects of alkoxy and alkylthio substituents on film alignment and electrical properties
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