Direct time-resolved detection of the luminescence at 1270 nm from 'singlet oxygen' was used to estimate the quantum yield of singlet oxygen production (aa) from a series of related porphyrins in benzene and in D 2 0 . From this and available data the fraction of oxygen quenching interactions leading to singlet oxygen production (S,) was derived in most cases. A marked increase in aA value was observed for di-haematoporphyrin ester (DHE) in cetyltrimethyl ammonium bromide/DzO solution in comparison to D,O alone, this increase is attributed to a major structural alteration of DHE on introduction of the detergent.

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