Abstract— –Photophysical properties of [26] porphyrin (26 P) were investigated in chloroform. The quantum yields of fluorescence, of S1→ T1 intersystem crossing and singlet oxygen formation were measured. The purity, stability, the strong absorption in the red (δmax= 783 nm; εmax= 28 000 M1 cm‐1) and the ability of singlet oxygen formation recommend 26 P as potential photosensitizer for tumor therapy.
Abstract— Photophysical properties of two chlorin type molecules (CHLI) and (CHLII) were investigated in different solvents. Quantum yields of fluorescence φF of S, → T, intersystem crossing φT, and of singlet oxygen (1Δg) formation φΔ, as well as the Stern‐Volmer constants for the quenching of the S, states by oxygen and the bimolecular rate constants of quenching of 1Δg by the chlorins were measured. The values of φT and φΛ can be given as 0.57 and 0.58 for CHLI and 0.69 and 0.58 for CHLII. The values of the fluorescence quantum yields, the strong absorption of the chlorins in the red (Λ > 630 nm) and the high values of the quantum yields for 1Δg formation recommend the chlorin derivatives as potential markers and photosensitizers for tumor therapy.
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