Rotaxanes azo-dye

From elemental analysis, the stoichiometric ratio between Ni2+ and the rotaxanated-azo-Dye was 1 1, which shows that the Ni-Dye complex forms linear chains via the hydroxyquinolone ligands. A possible structure of the Ni2+-Dye complex is shown in Scheme 4. 

Fig. 27 Normalized UV-Vis absorption spectra in the absence (solid line) and presence (dashed line) of Ni2+ ions added to 3 ml of 20-pM rotaxanated-azo-Dye solution...

Fig. 28 Titration of the change in the absorption of a rotaxanated-azo-Dye solution measured at - 532 nm vs. the concentration of added Ni2+ ions...

Scheme 4 Possible stmcture of the 1 1 complex of Ni2+ with the rotaxanated-Azo Dye...

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