Abstract
The photophysical and photochemical properties of a 5-azaprotoporphyrin derivative ([5]AZPP), a zinc-15-azaporphyrin derivative (Zn-[15]AZIDP) and an E–Z isomeric mixture of a 5-azachlorin derivative ([5]AZCH) were studied in various solvents. The quantum yields of fluorescence Φ 0 F, S 1–T 1 intersystem crossing Φ 0 T and singlet oxygen ( 1Δ g) formation Φ Δ were measured and the Stern—Volmer constants for the quenching of the S 1 states by oxygen and the rate constants of quenching of O 2( 1Δ g) by the different azaporphyrinoid compounds were obtained. The fluorescence quantum yield (Φ 0 F = 0.23), the strong absorption in the red (λ max = 674 nm, ϵ max = 66 000 M −1 cm −1) and the high value of the quantum yield for singlet oxygen ( 1Δ g) formation (Φ Δ = 0.65) observed for [5]AZCH recommend azachlorin derivatives as potential markers and photosensitizers for tumour therapy.
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