NDLI: Proton NMR study of the stoichiometry, stability and thermodynamics of complexation of Ag$^{+}$ ion with octathia-24-crown-8 in binary dimethylsulfoxide

Content Provider	Springer Nature Link
Author	Shamsipur, Mojtaba Irandoust, Mohsen Alizadeh, Kamal Lippolis, Vito
Copyright Year	2007
Abstract	Proton NMR was used to study the complexation reaction of Ag$^{+}$ with octathia-24-crown-8 (OT24C8) in a number of binary dimethylsulfoxide (DMSO)–nitrobenzene (NB) mixtures at different temperatures. In all cases, the exchange between free and complexed OT24C8 was fast on the NMR time scale and only a single population average $^{1}$H signal was observed. The formation constants of the resulting 1:1 complexes in different solvent mixtures were determined by computer fitting of the chemical shift-mole ratio data. There is an inverse relationship between the complex stability and the amount of DMSO in the solvent mixtures. The enthalpy and entropy values for the complexation reaction were evaluated from the temperature dependence of formation constants. In all solvent mixtures studied, the resulting complex is enthalpy stabilized but entropy destabilized. The TΔS° versus ΔH° plot of all thermodynamic data obtained shows a fairly good linear correlation indicating the existence of enthalpy–entropy compensation in the complexation reaction.
Starting Page	203
Ending Page	209
Page Count	7
File Format	PDF
ISSN	09230750
Journal	Journal of Inclusion Phenomena and Macrocyclic Chemistry
Volume Number	59
Issue Number	3-4
e-ISSN	15731111
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-06-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Octathia-24-crown-8 Ag$^{+}$ Proton NMR Mixed solvent Stoichiometry Formation constant Enthalpy Entropy Crystallography Food Science Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics Food Science

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