Method of quenching singlet and triplet excited states of pigments, such as porphyrin compounds, particularly protoporphyrin IX, with conjugated fused tricyclic compounds have electron withdrawing groups, to reduce generation of reactive oxygen species, particularly singlet oxygen

摘要

A method of quenching excited state energy from a pigment that has been excited by absorption of light having a wavelength in the wavelength range of 290-800 nm, comprising reacting a pigment with a conjugated fused tricyclic compound having electron withdrawing groups:of Formula (II) or a salt thereof:; wherein: A is selected from the group consisting of O, S, C═O, C═S, ; and; B¹, B², D¹, and D² are each independently selected from the group consisting of F, Cl, Br, I, CF₃, CCl₃, NR³₃⁺, NO₂, CN, C(═O)R⁴, C(═O)OR¹, SO₂R⁵, aryl, and —C═CHR⁶; each m independently is 0, 1, 2, 3, or 4; n is 0 or 1; each R¹ is independently selected from the group consisting of H, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, and aryl; R² is selected from the group consisting of H, alkyl, cycloalkyl, alkenyl, alkynyl, and aryl; each R³ is independently selected from the group consisting of H and C₁-C₆ alkyl; each R⁴ is independently selected from the group consisting of H, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, and aryl; each R⁵ is independently selected from the group consisting of H, O⁻, OH, NH₂, and Cl; and, each R⁶ is independently selected from the group consisting of alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, and aryl.