In this manuscript, we report for the very first time synthesis of a new purple azo dye (E)-1-((5-methoxy thiazolo[4,5-b]pyridin-2-yl) diazenyl) naphthalen-2-ol (TPN1). TPN1 also exhibits very interesting sensing behavior and can be potentially used for highly selective and sensitive detection of Cu2+, Sn2+ and Al3+. The changes in the absorption properties of TPN1 in the presence of various cations were studied extensively by UV visible spectroscopy. TPN1 dye which exhibits purple color changes to blue, orange, and lavender color respectively on addition of Cu2+, Sn2+, and Al3+ ions respectively. Notably, TPN1 reveal different color with the number of metal ions but the peak shifting could be observed only with three metal ions in solution. Addition of Cu2+ to TPN1 caused bathochromic shift, while in the case of Sn2+ and Al3+ a hypsochromic effect could be observed through UV-visible spectroscopy.
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