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

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