Inclusion complex formation of ternary system: Fluoroscein-p-sulfonato calix[4]arene-Cu2+ by cooperative binding

• The complexation of ternary system of fluorescein, p-SCX4 and Cu2+ were investigated.
• The binding constants and life time measurements were established.
• NMR and IR spectroscopic analysis studied for possible interaction in system.
• p-SCX4 is found efficient host for Cu2+ and fluorescein.

The aqueous solution of fluorescein-para sulfonato calix[4]arene-metal ion complex has been studied based on absorption, fluorescence, 1H NMR and FTIR spectroscopic results. It was found that the fluorescence intensity quenched regularly upon addition of pSCX4 and metal ion. The quenching constants and binding constants were determined for pSCX4–FL and pSCX4-FL–Cu2+ systems. 1:1 stoichiometry is obtained for pSCX4–Cu2+ system by continuous variation method. The NMR and IR results indicates the interaction among FL, pSCX4 and Cu2+. The combined results demonstrate the cooperative binding to design the complex for ternary system. The life time for binary and ternary system has been studied.

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