Quantum yield of singlet molecular oxygen sensitization by copper(II) tetracarboxyphthalocy anine

Abstract The quantum yield φ Δ for sensitization of singlet molecular oxygen, O 2 ( 1 Δ g ), by copper(II) tetracarboxyphthalocyanine (CuTCPc) in dimethyl sulphoxide was determined under stationary illumination, using diphenyl-isobenzofurane as chemical quencher. A constant value of φ Δ = 0.16 ± 0.03 was obtained, independent of sensitizer concentration in the range 2–26 μM even though dimers and possibly oligomers are present at the highest concentrations. The monomer and the aggregates of CuTCPc physically quench O 2 ( 1 Δ g ) with a nearly diffusional rate constant.

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