Perylene quinone compounds of natural and syntheitc origin have been investigated for their quantum efficiency of singlet‐oxygen production (Φ Δ ). The results may be interpreted by a qualitative relation between Φ Δ and the planarity of the sensitizer molecules, highest values (0.8–0.9) being observed where planarity is favoring tautomeric structures. On the other hand, derivatives exhibiting non‐planar quinoid structures show lower Φ Δ , and methylated derivatives react photochemically.
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Aminian‐Saghafi et al. (1992) studied this question.
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