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Spectroscopic Study of Some Alkali and Alkaline Earth Complexes with Benzo Crown Ethers in Ethanol Solution
Authors:Ali Jabbari  Mojtaba Shamsipur
Institution:Department of Chemistry , Shiraz University , Shiraz, Iran
Abstract:The interaction between Na+, K+, Mg2+ and Ca2+ ions and benzo crown ethers B15C5, DB18C6, DB21C7, DB24C8 and DB30C10 in ethanol solution has been studied spectrophotometrically at 25°C. The formation constants for 1:1 complexes were determined by computer fitting of the resulting UV-absorbance-mole ratio data. In the case of all crown ethers used, K+ ion was found to form the most stable complexes. The observed selectivities of different benzo crowns for the cations used are discussed in terms of the cavity-cation size ratio, number of the donating oxygens participating in the cation binding, conformations of the free and complexed ligands and ionic solvation.
Keywords:Alkali  Alkaline earth  Benzo crowns  Complexes  Ethanol  UV-spectrophotometry
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