Synthesis and study of electronic spectra of planar polymeric phthalocyanines

The electronic spectra of planar polymeric phthalocyanines complexed with copper and iron have been studied in concentrated sulphuric acid in comparison with the spectra of the 'monomeric counterparts used as model compounds both in concentrated sulphuric acid and in the vapour phase. Interpretation of the transitions associated with the B-band (Soret band) and the e-band have been made. Using oleum as solvent, it was possible to observe in fresh solutions the radical cation transitions of both monomeric and polymeric phthalocyanines occurring in the near-IR region between 850 and 1100 nm. The polymeric phthalocyanines were also characterized by Fourier transform IR spectroscopy. (C) 1997 Elsevier Science Ltd.