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The synthesis of 3-morpholino-7-[<i>N</i>-methyl-<i>N</i>-(4′-carboxyphenyl)amino]phenothiazinium chloride is reported here. Interestingly, non-symmetric phenothiazinium salt is functionalized with a carboxylic acid group that allows the easy and stable anchoring on metal oxides. In addition, the morpholine unit reduces the dye aggregation tendency; thus, improving its potential applications in the biomedical and photo-electrocatalytic field.