Complex Formation Between Crown Ethers and Urea and Some Guanidinium Derivatives in Methanol |
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| Authors: | Buschmann H-J Dong H Mutihac L Schollmeyer E |
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| Institution: | (1) Deutsches Textilforschungszentrum Nord-West e.V., Frankring 2, Krefeld, D-47798, Germany;(2) Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, Bucharest, Roumania |
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| Abstract: | The complexation of urea and some guanidinium derivatives by the ligands 15-crown-5, 18-crown-6, benzo-18-crown-6 and diaza-18-crown-6 in methanol has been studied by means of calorimetric titrations. The complex formation is mainly favored by entropic contributions. The number of solvent molecules released during the complex formation is responsible for the stability of the complexes formed.This revised version was published online in November 2005 with corrections to the Cover Date. |
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| Keywords: | calorimetry complex formation crown ethers guanidinium derivatives |
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