Phthalocyanines with peripheral azo chromophores

Tetrasubstituted (4-Chlorophenoxy)- And (2,4,5-Trichlorophenoxy)phthalocyanine Metal(ii) Complexes and Their Sulphonated Derivatives: Synthesis and Properties

“…It was also noted that FT-IR spectra of sulfonic acids are more diffuse compared to the initial ones, as was previously noted for phthalocyanines sulfonic acids. [20][21] The solubility in the synthesized phthalocyanines (4-7) in organic solvents or aqueous-alkaline solutions allowed us to study their spectral characteristics. So, electronic absorbance spectra of all synthesized complexes are characterized by intense absorption in the wavelength region of 660-680 nm, caused by the π-π* electronic transition in the main conjugation circuit of the phthalocyanine ring.…”