Cation complexing of crown ethers using fluorescence spectroscopy, part II

Erk C., Gocmen A.

TALANTA, cilt.53, ss.137-140, 2000 (SCI İndekslerine Giren Dergi) identifier identifier


The complex formations of benzo[12]crown-4, benzo[15]crown-5 and benzo[18]crown-6 with perchlorate salts of Mg2+, 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, 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. (C) 2000 Elsevier Science B.V. All rights reserved.