Synthesis, characterization and electrochemical properties of novel metal free and zinc(II) phthalocyanines of ball and clamshell types


Ceyhan T., Altindal A., Ozkaya A. R. , Celikbicak O., Salih B., Erbil M. K. , ...Daha Fazla

POLYHEDRON, cilt.26, ss.4239-4249, 2007 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 26 Konu: 15
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.poly.2007.05.028
  • Dergi Adı: POLYHEDRON
  • Sayfa Sayıları: ss.4239-4249

Özet

The phthalodinitrile derivative I was prepared by the reaction of 4-nitrophthalonitrile and 1,3-dimethoxy-4-tert-butylcalix[4]arene in dry dimethylsulfoxide as the solvent, in the presence of the base K2CO3, by nucleophilic substitution of an activated nitro group in an aromatic ring. The tetramerization of compound I gave a binuclear zinc(II) phthalocyanine and a metal-free phthalocyanine of the ball type, 2 and 3, respectively. Its condensation with 4,5-bis(hexylthio)phthalonitrile results in a binuclear plithalocyanine of the clamshell type, 4. The newly synthesized compounds were characterized by elemental analysis, UV-Vis, IR, MS and H-1 NMR spectra. The electronic spectra exhibit an intense pi -> pi* transition with characteristic Q and B bands of the phthalocyanine core. The electrochemical properties of 2-4 were examined by cyclic voltammetry in non-aqueous media. The voltammetric results showed that while there is no considerable interaction between the two phthalocyanine rings in 4, the splitting of a molecular orbital occurs as a result of the strong interaction between the phthalocyanine rings in 2 and 3. (c) 2007 Elsevier Ltd. All rights reserved.