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The corresponding porphyrin\u2010type chlorophyll derivatives were prepared by the oxidation (17,18\u2010didehydrogenation) of the chlorin\u2010type. Their Qy absorption and fluorescence emission maxima in dichloromethane correlated well with Hammett substituent constants of the <jats:italic>p<\/jats:italic>\u2010substituents. Several electron\u2010withdrawing <jats:italic>p\u2010<\/jats:italic>substituents suppressed the emission due to photoinduced electron transfer quenching in a molecule. 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