Optical investigation of thin films of liquid-crystalline lutetium bisphthalocyanine

BASOVA, T., KOL'TSOV, E., HASSAN, A. K., NABOK, A. V., RAY, A. K., GUREK, A. G. and AHSEN, V. (2004). Optical investigation of thin films of liquid-crystalline lutetium bisphthalocyanine. Journal of Materials Science: Materials in Electronics, 15 (9), 623-628.

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Abstract

Thin films of bis[4,5,4',5',4",5",4"',5"']-octakis(hexylthiophthalocyanine) of lutetium(III) were prepared by spin coating at different speeds in the range of 2000-6000 rpm. The films undergo phase transition on heat treatment at temperatures above 120 degreesC and the formation of a mesophase. The Q-bands in the visible absorption spectra of the films are broader and become red shifted compared to ones obtained for molecules in chloroform solution. Heat treatment produces molecular ordering, which is believed to be due to the edge-to-edge interaction between neighboring Pc moieties. Reduced film thickness and changes in optical constants are also attributed to thermally induced molecular reorganization corresponding to the liquid crystalline phase. AFM and polarized microscopy images are consistent with the phase transformations. (C) 2004 Kluwer Academic Publishers.

Item Type:	Article
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group
Identification Number:	https://doi.org/10.1023/B:JMSE.0000036043.00961.be
Page Range:	623-628
Depositing User:	Ann Betterton
Date Deposited:	20 Apr 2010 15:17
Last Modified:	18 Mar 2021 21:30
URI:	https://shura.shu.ac.uk/id/eprint/1391

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