Stability of 15-Crown-5 and Benzo-15-Crown-5 Complexes With Alkali Metal Cations in Nonaqueous Media

Wagner-Czauderna, Elżbieta; Koczorowska, Anna; Kalinowski, Marek K.

doi:10.1080/00958979908048471

Cited by 25 publications

(12 citation statements)

References 43 publications

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“…These results are in agreement with the stability constants determined by Kalinowski and coworkers [16] for lithium (log K = 3.8), sodium (log K = 4.5), potassium (log K = 4.2) and by Hasani and Shamsipur for ammonium cation (log K = 3.02) [17].…”

Section: Electrochemical Recognitionsupporting

confidence: 92%

Electrochemical behaviour of tetraazamacrocyclic nickel(II) complexes functionalized with crown ethers

Taraszewska

Zięba

Kowalski

et al. 2008

Electrochimica Acta

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Section: Electrochemical Recognitionsupporting

confidence: 92%

Electrochemical behaviour of tetraazamacrocyclic nickel(II) complexes functionalized with crown ethers

Taraszewska

Zięba

Kowalski

et al. 2008

Electrochimica Acta

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“…With the discovery of macrocyclic polyethers by Pedersen [1], a lot of data have been published on equilibrium constants and thermodynamic functions of complex formation of crown ethers with alkali and alkaline earth metal cations, transition metal ions, lanthanide ions and small organic molecules [2,3]. The interactions between these ligands and metal cations are noncovalent during complexation reactions [4,5].…”

Section: Introductionmentioning

confidence: 99%

Conductometric study of complexation process between dibenzo-18-crown-6 and K+, Na+, and La3+ cations in some binary mixed non-aqueous solvents

Khoshnood

Teymoori

Hatami

et al. 2015

Russ. J. Phys. Chem.

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The complexation reactions between K + , Na + , and La 3+ cations and the macrocyclic ligand dibenzo-18-crown-6 (DB18C6) were studied in acetionitrile (AN)-dimethylformamide (DMF) binary mixtures. Also, the complexation of K + and Na + in 50% ethanol (EtOH)-50% DMF and 50% EtOH-50% AN binary mixtures was studied. The conductivity data show that the stochiometry of all the complexes is 1 : 1. A non-linear behavior was observed for the log K f variation vs. composition of binary solvent, which was discussed in terms of heteroselective solvation and solvent-solvent interactions in binary solutions. It was found that the stability order of the complexes changes with composition of the mixed solvents. The stability sequence for AN-DMF (25 and 50 mol % DMF) solutions and pure AN at 25°C is [K(DB18C6)] + > [Na(DB18C6)] + > [La(DB18C6)] 3+ . However, at 75 mol % DMF it changes to [Na(DB18C6)] + > [K(DB18C6)] + > [La(DB18C6)] 3+ . The thermodynamical values ( , ) for these complexation reactions were determined from the temperature dependence of the stability constants. The thermodynamics of the complexation reactions is affected by the nature and composition of the mixed solvents.

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“…Since the discovery of complexing capabilities of crown ethers, numerous data have been published on equilibrium constants and thermodynamic functions of complex formation of crown ethers with metal cations and small organic molecules but mainly in pure organic solvents themselves [6][7][8][9][10]. The very small number of such data concerning the complex formation in mixed (water + organic solvents) [11][12][13][14][15][16][17] was the reason for undertaking this kind of studies in our laboratory.…”

Section: Introductionmentioning

confidence: 99%

Complex formation of crown ethers with cations in the (water+organic solvent) mixtures. Part VI. Thermodynamic of interactions of Na+ ion with benzo-15-crown-5 ether in {(1−x)DMF+xH2O} at 298.15 K

Jóźwiak¹

2004

The Journal of Chemical Thermodynamics

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The equilibrium constants of complex formation of benzo-15-crown-5 ether with sodium cation in {ð1 À xÞDMF + xH 2 O} were calculated using conductometric measurements. The thermodynamic functions of complex formation, the transfer enthalpy of complex from DMF to mixed solvent and the influence of benzene ring on the process of complex formation were calculated and discussed together with the same function in {ð1 À xÞDMSO + xH 2 O}. A good relationship between the enthalpy and entropy of complex formation was observed.

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Stability of 15-Crown-5 and Benzo-15-Crown-5 Complexes With Alkali Metal Cations in Nonaqueous Media

Cited by 25 publications

References 43 publications

Electrochemical behaviour of tetraazamacrocyclic nickel(II) complexes functionalized with crown ethers

Electrochemical behaviour of tetraazamacrocyclic nickel(II) complexes functionalized with crown ethers

Conductometric study of complexation process between dibenzo-18-crown-6 and K+, Na+, and La3+ cations in some binary mixed non-aqueous solvents

Complex formation of crown ethers with cations in the (water+organic solvent) mixtures. Part VI. Thermodynamic of interactions of Na+ ion with benzo-15-crown-5 ether in {(1−x)DMF+xH2O} at 298.15 K

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