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• W1993695360 abstract "To improve photodynamic activity of the parent hypocrellin B (HB), a tetra-brominated HB derivative (compound 1) was synthesized in high yield. Compared with HB, compound 1 has enhanced red absorption and high molar extinction coefficients. The photodynamic action of compound 1, especially the generation mechanism and efficiencies of active species (Sens*-, O2*- and 1O2) were studied using electron paramagnetic resonance (EPR) and spectrophotometric methods. In the deoxygenated DMSO solution of compound 1, the semiquinone anion radical of compound 1 is photogenerated via the self-electron transfer between the excited and ground state species. The presence of electron donor significantly promotes the reduction of compound 1. When oxygen is present, superoxide anion radical (O2*-) is formed via the electron transfer from Sens*- to the ground state molecular oxygen. The efficiencies of Sens*- and O2*- generation by compound 1 are about three and two times as much as that of HB, respectively. Singlet oxygen (1O2) can be produced via the energy transfer from triplet compound 1 to ground state oxygen molecules. The quantum yield of singlet oxygen (1O2) is 0.54 in CHCl3 similar to that of HB. Furthermore, it was found that the accumulation of Sens*- would replace that of O2*- or 1O2 with the depletion of oxygen in the sealed system." @default.
• W1993695360 created "2016-06-24" @default.
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• W1993695360 date "2001-01-01" @default.
• W1993695360 modified "2023-10-18" @default.
• W1993695360 title "Photogeneration of singlet oxygen (¹O₂) and free radicals (Sen^·-, O^·-₂) by<i>tetra</i>-brominated hypocrellin B derivative" @default.
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• W1993695360 doi "https://doi.org/10.1080/10715760100301271" @default.
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