Some Properties of an Unmetalled Phthalocyanine Obtained by Chance at Low Temperature

Abstract

A novel tetrasubstituted metal-free phthalocyanine bearing phthalonitrile groups on theperipheral positions was synthesized accidentally by the cyclotetramerization reaction of the 4,4’-(1,3-phenylenebis(oxy))diphthalonitrile. For photodynamic therapy (PDT) application, photophysicalproperties including fluorescence quantum yield (ΦF), fluorescence lifetime (τF), triplet state lifetime(τT), and triplet quantum yield (ΦT) and photochemical properties including singlet oxygen quantumyield (Φ) and photodegradation quantum yield (Φd) as well as magnetic circular dichroism (MCD)properties were described. The ΦT of the phthalocyanine was 0.81. The obtained lifetime (τT) was 40 μsfor metal-free Pc.