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A series of unsymmetrical 3,7-(N,N-disubstituted-amino)-phenothiazin-5-ium iodides have been prepared by stepwise reaction of secondary amines with phenothiazin-5-ium tetraiodide hydrate. The singlet oxygen generating efficiencies and polarity characteristics of the dyes are compared with those of Methylene Blue, and the factors influencing the potential value of these compounds as photosensitisers...
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