NDLI: Stabilities in Water of Alkali Metal Ion Complexes with Dibenzo-24-crown-8 and Dibenzo-18-crown-6 and Their Transfer Activity Coefficients from Water to Nonaqueous Solvents

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Stabilities in Water of Alkali Metal Ion Complexes with Dibenzo-24-crown-8 and Dibenzo-18-crown-6 and Their Transfer Activity Coefficients from Water to Nonaqueous Solvents

Content Provider	Springer Nature Link
Author	Katsuta, Shoichi Tachibana, Hayato Takeda, Yasuyuki
Copyright Year	2002
Abstract	Stability constants K $_{ML}$ for the 1:1 complexes of Na$^{+}$, K$^{+}$, Rb$^{+}$, and Cs$^{+}$ with dibenzo-24-crown-8 (DB24C8) and dibenzo-18-crown-6 (DB18C6) in water have been determined by a capillary electrophoretic technique at 25°C. The K $_{ML}$ sequence is Na$^{+}$ < K$^{+}$ < Rb$^{+}$ < Cs$^{+}$ for DB24C8 and Na$^{+}$ < K$^{+}$ > Rb$^{+}$ > Cs$^{+}$ for DB18C6. Compared with DB18C6, DB24C8 exhibits higher selectivity for K$^{+}$ over Na$^{+}$, but lower selectivity for K$^{+}$, Rb$^{+}$, and Cs$^{+}$. To evaluate the solvation of the complexes in water, their transfer activity coefficients s$_{γ}$H$_{2}$O between polar nonaqueous solvents and water have been calculated. The s$_{γ}$H$_{2}$O values provide the following information: interactions with water of the metal ions and of the crown-ether oxygens are greatly reduced upon complexation and the complexes undergo hydrophobic hydration in water; the character of each alkali metal ion in solvation is more effectively masked by DB24C8 than by DB18C6, because of the larger and more flexible ring structure of DB24C8. Solvent effects on the complex stabilities are discussed on the basis of the s$_{γ}$H$_{2}$O values.
Starting Page	499
Ending Page	510
Page Count	12
File Format	PDF
ISSN	00959782
Journal	Journal of Solution Chemistry
Volume Number	31
Issue Number	6
e-ISSN	15728927
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Industrial Chemistry/Chemical Engineering Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Biochemistry Molecular Biology Biophysics Physical and Theoretical Chemistry

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Stabilities in Polar Nonaqueous Solvents and Transfer Activity Coefficients from Water to Nonaqueous Solvents of 19-Crown-6-Alkali Metal Ion Complexes

Stabilities in Water and Transfer Activity Coefficients from Water to Nonaqueous Solvents of Benzo-18-crown-6–Metal Ion Complexes

Transfer activity coefficients of crown ethers and their alkali metal ion complexes between water and polar nonaqueous solvents

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Study of complexation reactions between alkali and alkaline-earth metal cations with dibenzo-18-crown-6(DB18C6) in mixed nonaqueous solvents using the conductometry method

Thermodynamic studies of the complexation of 18-crown-6 and dibenzo-24- crown-8 with potassium ion in mixed non-aqueous solvents

A Conductance Study of Alkali Metal Ion-15-Crown-5, 18-Crown-6, and Dibenzo-24-crown-8 Complexes in Propylene Carbonate

Stabilities and Transfer Activity Coefficients of Benzo-15-crown-5-Alkali Metal Ion Complexes in Various Solvents

Stabilities in Water of Alkali Metal Ion Complexes with Dibenzo-24-crown-8 and Dibenzo-18-crown-6 and Their Transfer Activity Coefficients from Water to Nonaqueous Solvents

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