Interactions between Crown Ethers and Water,Methanol, Acetone,and Acetonitrile in Halogenated Solvents |
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Authors: | Hans-Jürgen Buschmann Radu-Cristian Mutihac Eckhard Schollmeyer |
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Institution: | 1.Deutsches Textilforschungszentrum Nord-West e.V.,Institut an der Universit?t Duisburg-Essen,Krefeld,Germany |
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Abstract: | The interactions between crown ethers and water, methanol, acetone, and acetonitrile molecules in halogenated solvents are
studied by means of calorimetric measurements. The results reveal the formation of 1:1 complexes between crown ethers and
water in chloroform. The hydrogen bonding and ion–dipole interactions are responsible for the complex formation between the
water molecules and crown ethers. For a better understanding of the influence of chloroform upon the complexation between
crown ethers and water, chloroform is replaced by dichloromethane, 1,2-dichloroethane, and carbon tetrachloride. Since the
hydrogen bonds are responsible for the complex formation between crown ethers and water in the halogenated solvents, further
investigations are performed with methanol, acetone and acetonitrile. The interactions, the ligand nature, the concentrations
of polar solvents, and the nature of nonpolar solvents involved in complexation are analyzed and discussed. |
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