Inclusion complex formation of ternary system: Fluoroscein-p-sulfonato calix[4]arene-Cu(2+) by cooperative binding

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Sep 5:148:382-8. doi: 10.1016/j.saa.2015.03.103. Epub 2015 Apr 16.

Abstract

The aqueous solution of fluorescein-para sulfonato calix[4]arene-metal ion complex has been studied based on absorption, fluorescence, (1)H 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-Cu(2+) systems. 1:1 stoichiometry is obtained for pSCX4-Cu(2+) system by continuous variation method. The NMR and IR results indicates the interaction among FL, pSCX4 and Cu(2+). 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.

Keywords: Cooperative binding; Fluorescein (FL); Para sulfonato calix[4]arene; Ternary system.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Calixarenes / chemistry*
  • Cations, Divalent / chemistry
  • Coordination Complexes / chemistry*
  • Copper / chemistry*
  • Fluorescein / chemistry*
  • Magnetic Resonance Spectroscopy
  • Models, Molecular
  • Phenols / chemistry*
  • Spectrometry, Fluorescence
  • Spectroscopy, Fourier Transform Infrared

Substances

  • Cations, Divalent
  • Coordination Complexes
  • Phenols
  • p-sulfonatocalix(4)arene
  • Calixarenes
  • Copper
  • Fluorescein