[Quenching of singlet oxygen with chlorophylls and porphyrins].

The rate constants (kox) of irreversible oxidation of chlorophylls and porphyrins by 1 delta g state of oxygen (1O2) have been determined. It has been shown that kox values are 1-5 orders of magnitude lower than the values of rate constants of quenching 1O2 (kq) with the same pigments. The correlation between kox and kq has been found.

[Quenching of the luminescence of singlet molecular oxygen by complexes of porphyrins and highly-charged metal ions].

Quenching of singlet oxygen luminescence by the complexes of tetraphenylporphin with Fe3+, Mn3+, Sn4+, and Al3+, synthetic dimer of TTP (mu-oxo-bis-FeTPP) and by Fe3+-meso-porphyrin-IX-dimethylester has been investigated. Quenching obeys the Stern - Folmer equation. The rate constants of 1O2 quenching (Kq) by monomeric Fe-Porphyrins correspond to 1-1.

[Suppression of singlet oxygen luminescence by porphyrins and metalloporphyrins].

The luminescene of 1O2 (1270 nm) has been observed upon illumination of air saturated solutions of different porphyrins and their complexes with Zn in CCl4. In solutions of Co-, Cu-, Ni- and Fe-porphyrins this luminescence has not been revealed. All the porphyrins studied have shown to quench 1O2, the rate constants of the "physical" and "chemical" quenching being measured.