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Optical properties of soluble phthalocyanines

S. POCHEKAYLOV1,* , D. RAIS1, S. NEŠPŮREK2, J. RAKUŠAN3, M. KARÁSKOVÁ3

Affiliation

  1. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic
  2. Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
  3. Research Institute for Organic Syntheses, 532 18 Pardubice-Rybitví, Czech Republic

Abstract

The optical properties of a new group of soluble phthalocyanines (Pc), containing sulpho-, amino- and sulphonamide groups are presented. The optical absorption spectrum consists of two main bands, Q and Soret ones, with maxima at about 600 – 700 and 350 – 400 nm, respectively, and of a broad optical window with a lower linear absorption at about 500 nm. The oxidation energies for different sulphonamide substituted phthalocyanines were determined using cyclic voltammetry. They ranged from -5.46 to -5×10 eV. Thus, the positions of the LUMO levels are in the region -3.85 to -4.27 eV. The band gap energies were determined from optical absorption spectra, and ranged from 1.69 to 1.75 eV. The thin films, after deposition by spin coating or dipping, were usually amorphous, but they could be converted into crystalline films by thermal treatment, as shown by WAXS studies..

Keywords

Phthalocyanine, Optical properties, Absorption spectrum, Charge transfer complex, Thin film.

Submitted at: Nov. 28, 2006
Accepted at: Feb. 15, 2007

Citation

S. POCHEKAYLOV, D. RAIS, S. NEŠPŮREK, J. RAKUŠAN, M. KARÁSKOVÁ, Optical properties of soluble phthalocyanines, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 2, pp. 479-482 (2007)