NDLI: Study of complex formation between dicyclohexyl-18-crown-6 and UO$_{2}$ $^{2+}$ cation in some binary mixed non-aqueous solvents using conductometric method

Content Provider	Springer Nature Link
Author	Razghandi, F. Rounaghi, G. H. Eshaghi, Z.
Copyright Year	2011
Abstract	In the present work, the complexation process between UO$_{2}$ $^{2+}$ cation and the macrocyclic ligand, dicyclohexyl-18-crown-6 (DCH18C6) was studied in ethyl acetate/1,2-dichloroethane (EtOAc/DCE), acetonitrile/1,2-dichloroethane (AN/DCE), methanol/1,2-dichloroethane (MeOH/DCE) and ethanol/1,2-dichloroethane (EtOH/DCE) binary solutions at different temperatures using the conductometric method. The conductance data show that in most cases, the stoichiometry of the complex formed between DCH18C6 and UO$_{2}$ $^{2+}$ cation is 1:1 [M:L], but in some solvent systems also a 1:2 [M:L$_{2}$] complex is formed in solutions. The values of stability constant of (DCH18C6·UO$_{2}$)$^{2+}$ complex which were obtained from conductometric data, show that the stability of the complex is affected by the nature and also the composition of the solvent system and in all cases, a non-linear behavior is observed for the variation of (log K $_{f}$) of the (DCH18C6·UO$_{2}$)$^{2+}$ complex versus the composition of the binary mixed solvents. The values of thermodynamic quantities $$ Δ H_{c}^{\circ} $$ and $$ Δ S_{c}^{\circ} $$ for formation of (DCH18C6·UO$_{2}$)$^{2+}$ complex were obtained from temperature dependence of the stability constant using the van’t Hoff plots. The experimental results show that depending on the nature and composition of the solvent systems, the complex is enthalpy stabilized or destabilized, but in most cases, it is stabilized from entropy view point and both thermodynamic parameters are affected by the nature and composition of the binary mixed solutions.
Starting Page	87
Ending Page	92
Page Count	6
File Format	PDF
ISSN	09230750
Journal	Journal of Inclusion Phenomena and Macrocyclic Chemistry
Volume Number	73
Issue Number	1-4
e-ISSN	15731111
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-08-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	UO$_{2}$ $^{2+}$ cation Dicyclohexyl-18-crown-6 Acetonitrile Ethyl acetate Methanol Ethanol 1,2-Dichloroethane Conductometry Organic Chemistry Crystallography Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics Food Science

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