Synthesis, electrochemical and photophysical studies of axially substituted quarternizable titanyl phthalocyanines


DYES AND PIGMENTS, vol.97, no.2, pp.340-346, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 97 Issue: 2
  • Publication Date: 2013
  • Doi Number: 10.1016/j.dyepig.2012.12.022
  • Journal Name: DYES AND PIGMENTS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.340-346
  • Keywords: Titanyl, Phthalocyanine, Photodynamic therapy, Axial substitution, Water soluble, Fluorescence, PHOTODYNAMIC THERAPY, TITANYLPHTHALOCYANINES, AZAPHTHALOCYANINES, TITANIUM(IV), BEHAVIOR
  • Istanbul Technical University Affiliated: Yes


This work reports on the synthesis, characterization, photophysical properties and electrochemical characterization of new tetra-substituted titanium phthalocyanine with dimethylaminoethanol groups on peripheral positions (2) and water-soluble quaternized counterpart. The water-soluble titanium(IV) phthalocyanine derivative (3) was found to be aggregated in aqueous media but was partially or fully disaggregated in the presence of a surfactant Triton X-100. The capping of the titanyl (metaloxo) inner core with catechol derivatives (4-7) were also synthesized. The axially substituted titanium phthalocyanines show high solubility and a low aggregation tendency due to the steric hindrance. The structures of these compounds were characterized by using elemental analyses, UV-Vis, FT-IR, H-1 NMR and mass spectroscopies. Their photophysical properties were also studied and fluorescence quantum yields were found to range from 0.02 to 0.13. The electrochemical properties of 2 were also investigated by using cyclic voltammetry in this report. (C) 2013 Elsevier Ltd. All rights reserved.