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HERO ID
6848806
Reference Type
Journal Article
Title
Conductometry and solubility studies of (Cd2+-kryptofix-22) complexes in various hydroorganic solvents
Author(s)
El-Khouly, AA; El-Khouly, AA; Gomaa, EA; Gomaa, EA; El-Leef, SA; El-Leef, SA
Year
2003
Volume
19
Issue
4
Page Numbers
153-164
Abstract
On using conductometric technique, the apparent association (K-A), dissociation (K-D) and triple ion association (K-3) constants of the different types of complexes (1:1, 1:2 and 2:1) producedfrom the reaction of CdCl2 with Kryptofix-22 (1,7,10,16-tetraoxa-4,13-diaza-cyclo-octodecane) in pure water and in mixed (water-organic) solvents, using different proportions of each were successfully determined. The hydroorganic solvents used were methanol(MeOH), ethanol (EtOH) as amphiprotic hydrogen bond acceptor-donor (HBAD) solvents, dimethyl sulfoxide (DMSO), 1,4-dioxane (DI) as hydrogen bond acceptor (HBA) solvents and acetonitrile (AN) as (HBA-HBD) solvent. In addition to (K-A), (K-D) and (K-3) values, the molar solvated (V), Van der Waals (V-w) and electrostriction (V-e) volumes were calculated. Molar and limiting conductances (Lambda Lambda(0)) were measured and calculated respectively. The values of Walden product (Lambda(0) eta(0)), fluidity ratios (R-x), free energies. of association (DeltaG(A)), transfer free energies of association (DeltaG(t)), transfer and free energies of solvation (DeltaG(t))(s) and (DeltaG)(s) respectively and its values of enthalpy (DeltaH)(s) and entropy (DeltaS)(s) were determined from the solubility measurements and were well discussed.<
Keywords
conductometry; solubility; kryptofix-22; association; dissociation; amphiprotic solvent; molar solvated volume; Van der Waals volume; electrostriction volume; molar and limiting conductances; free energy of association and solvation
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OPPT REs
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OPPT_1,4-Dioxane_D. Exposure
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