Article

Journal of Materials Science: Materials in Electronics

, Volume 15, Issue 9, pp 623-628

First online:

Optical investigation of thin films of liquid–crystalline lutetium bisphthalocyanine

  • T. BasovaAffiliated withInstitute of Inorganic Chemistry
  • , E. Kol’tsovAffiliated withInstitute of Inorganic Chemistry
  • , A. K. HassanAffiliated withNanotechnology Research Laboratory, School of Engineering, Sheffield Hallam University
  • , A. NabokAffiliated withNanotechnology Research Laboratory, School of Engineering, Sheffield Hallam University
  • , A. K. RayAffiliated withNanotechnology Research Laboratory, School of Engineering, Sheffield Hallam University
  • , A. G. GürekAffiliated withDepartment of Chemistry, Gebze Institute of Technology
  • , V. AhsenAffiliated withDepartment of Chemistry, Gebze Institute of TechnologyTUBITAK-Marmara Research Center, Materials and Chemical Technologies Research Institute

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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 °C 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.