Cation complexing of crown ethers using fluorescence spectroscopy, part II.
The complex formations of benzo[12]crown-4, benzo[15]crown-5 and benzo[18]crown-6 with perchlorate salts of Mg(2+), Li(+) and Na(+) were investigated using the steady state fluorescence emission spectroscopy in acetonitrile. The complexation enhanced quenched fluorescence spectra, (CEQFS) exhibited the ion complexation role of the macrocyclic ethers and equilibrium constant, K(e) of 1:1 stoichiometry were estimated. The K(e) were found in the order of Mg(+)>Na(+)>Li(+) for benzo[15]crown-5 whilst Na(+)>Mg(+)>Li(+) order was found with benzo[12]crown-4 at 298 K.
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Organic Chemistry Laboratoires, Chemistry Department, Istanbul Technical University, Maslak, 80626 Istanbul, Turkey.
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