Synthesis of some new mono azo organic compounds, based on 1‐arylazo‐2‐naphthol nucleus is performed by diazo‐coupling strategy of β‐naphthol with different 1ry aromatic amines. Interestingly, the monoazo products undergo functionalized reactions to obtain the target azo naphthol derivatives (3–14). The synthesized dyes are conjugated with gold and/ or silver nanoparticles by electrostatic interaction. Photodynamic therapeutic efficiencies of the synthesized naphthol azo dyes and their conjugates have been evaluated against promyelocytic leukemia cell lines (HL‐60) in dark and light conditions. Dye‐Nanometal conjugates act as photosensitizers (PSs) exhibiting an enhancement of the optical properties as well as in photodynamic therapeutic efficiencies in variable degrees depending on dye structure.
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