Definition of phthalocyanine in US English:



  • 1A greenish-blue crystalline dye of the porphyrin group.

    Chemical formula: C₃₂H₁₈N₈

    • ‘As discussed previously, the phthalocyanine interacts with either the phospholipids or the apoprotein moiety of LDL, and therefore, the radicals are likely to be mainly produced at the lipid-water interface.’
    • ‘Organic compounds such as phthalocyanine produce greens and blues.’
    • ‘By attaching differing substituent groups, some of which are water soluble and some of which are fat soluble, an unsymmetrically substituted phthalocyanine is created which is both water and fat soluble.’
    • ‘This spectrum clearly indicates efficient singlet-singlet energy transfer from carotenoid to phthalocyanine.’
    • ‘In general, these newer drugs have been based on the structure of chlorin, purpurin, phthalocyanine or naphthalocyanine.’
    1. 1.1 Any of a large class of green or blue pigments and dyes that are chelate complexes of this compound or one of its derivatives with a metal (in particular, copper)
      as modifier ‘phthalocyanine blue’
      • ‘It was found that a combination of cobalt or iron phthalocyanine and sodium ascorbate has high in vitro and in vivo antitumor activity.’
      • ‘The suppression of the photodynamic potency of aluminum phthalocyanines was attributed to desorption of the dyes from lipid bilayers induced by fluoride or hydroxyl ions.’
      • ‘Previous investigators have demonstrated that sulfonated aluminum phthalocyanine is primarily distributed outside the nucleus.’
      • ‘Among the aluminum phthalocyanines, the hydrophilic tetrasulfonated derivative is localized in the vascular stroma and induces tumor regression by the indirect mechanism of vascular destruction.’


1930s: from phthalic (see phthalic acid) + Greek kuan(e)os ‘dark blue’ + -ine.