The determination of crown-cation complexation behavior in dioxane/water mixtures by conductometric studies

Çiçek, Baki; Çakır, Ümit; Erk, Çakıl

doi:10.1002/(sici)1099-1581(199812)9:12<831::aid-pat841>3.0.co;2-7

Cited by 17 publications

(15 citation statements)

References 8 publications

(8 reference statements)

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“…(Λ Ma m+ - Λ)/(Λ Ma m+ - Λ M a L b m+ ) and C M , C L are the total concentrations of metal ion and crown ether, respectively; [M a m+ ] , [L b ] and [M a L b m + ] , are the concentrations of uncomplexed action, uncomplexed crown ether and complexed cation, respectively; P, is the experimental mole fraction of the complexed cation or the ligand, and a and b are the complexing degrees of both sides in the case of several degrees of complexing [eqns. (1)-(13)] κ Ma m+ , κ M a L b m+ , are the observed conductivities of the electrolyte and the crown compound-electrolyte complex, respectively; Λ Ma m+ and Λ M a L b m+ are the designated molar conductivities of the electrolyte and the crown compound-electrolyte complex, respectively [21]. …”

Section: Resultsmentioning

confidence: 99%

“…The selectivity for a given salt is a factor not only of the crown ether, but of the solvent as well [21,24]. These various selectivities depend on the crown ether interactions with the cations governed by charge density.…”

Section: Resultsmentioning

confidence: 99%

“…All oxo-thio crown ethers B1-B6 have systematic variations in the ring size of the crown ether ring from [12]crown-4 to [15]crown-5 to [18]crown-6 to [21]crown-7, respectively. Results of our alkali metal complexation study using oxo-thio crown ether derivatives are presented in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…The synthesized thiocrown ethers exhibited remarkably high binding constants in metal ion transport experiments [21,24,26]. …”

Section: Discussionmentioning

confidence: 99%

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Synthesis, Metal Ion Complexation and Computational Studies of Thio Oxocrown Ethers

Çiçek

Yıldız

2011

Molecules

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The synthesis of some thio-oxocrown ether ligands, B1 (1,4-dithio-12-crown-4), B2 (1,7-dithio-12-crown-4), B3 (1,7-dithio-15-Crown-5), B4 (1,7-dithio-18-crown-6), B5 (1,10-dithio-18-crown-6), B6 (1,10-dithio-21-crown-7), under mild conditions, were reported. The ligands were characterized by FT-IR, 1H NMR and GC-MS spectroscopy. The formation of 1:1 ligand complexes with a variety of metal salts (Ag+, Ca+2, K+, Na+, Mg+2, Zn+2 and Fe+2) were investigated by a conductometric method in a 1:1 dioxane–water system at 25 °C, and the complexation constants (Ke = (ΛMAm -Λ) / ((Λ-ΛMaLbAm) [L]) and free energy (∆Go= - RT lnKe) values are calculated. Details of the specific molecular interactions between the ligands and metals were proposed. We also performed DFT calculations to explain their geometrical properties, charges and frontier molecular orbitals.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The synthesized thiocrown ethers exhibited remarkably high binding constants in metal ion transport experiments [21,24,26]. …”

Section: Discussionmentioning

confidence: 99%

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Synthesis, Metal Ion Complexation and Computational Studies of Thio Oxocrown Ethers

Çiçek

Yıldız

2011

Molecules

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“…[4,5,8,18] All the experimental studies used the a 1:2 ratio of the metal -ion to the Schiff base ligand. L = 1000 k/C MX where C MX is the total concentration of the metal salt.…”

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confidence: 99%

Spectroscopic and Conductance Studies of New Transition Metal Complexes with a Schiff Base Derived from 4‐Methoxybenzaldehyde and 1,2‐bis(p‐Aminophenoxy)ethane

Çakır

Temel

İhan

et al. 2003

Spectroscopy Letters

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Four new metal complexes of Cu(II), Ni(II), Zn(II) and Co(III) with Schiff base derived from 4-methoxybenzaldehyde and 1,2-bis( p-aminophenoxy)ethane have been prepared and characterized by magnetic susceptibility, conductance measurements, elemental analyses, UV -Vis, H NMR and IR spectra studies. The magnetic and spectroscopic data indicate an octahedral geometry for the six-coordinate complexes. The ligand was used for complexation studies. Stability constants were measured by means of a conductometric method. Furthermore, the stability constants for complexation between ZnCl 2 , Cu(NO 3 ) 2 and AgNO 3 salts and ligand (L) in 80% dioxane -water and pure methanol were determined from conductance measurements. In 80% dioxane -water, the stability constants (log Ke) increase inversely with the crystal radii in the order Ag(I) < Zn(II) < Cu(II).

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Complexation studies of some newly synthesized precursors for substituted dibenzo and dibenzodiaza crown ethers

Çakır

Uğraş

Temel

et al. 2003

J of Applied Polymer Sci

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This study represents the synthesis of dibenzo and dibenzodiaza crown ether precursors with various functional groups in good yield by employing four different methods using polar protic and aprotic solvents with high boiling points. Also the complexation abilities of all synthesized ligands with Cu 2ϩ , Zn 2ϩ , and Ag ϩ were studied by conductometry; thus the conductometric behavior of Cu(NO 3 ) 2 , ZnCI 2 , and AgNO 3 in 80% dioxane-water mixture was investigated in the presence of these ligands.The order of formation constant for complexes of the ligands with Cu 2ϩ , Zn 2ϩ , and Ag ϩ ions was found to be: Cu 2ϩ Ͼ Zn 2ϩ Ͼ Ag ϩ for the ligands of VI, VII, XI, and XII; Cu 2ϩ Ͼ Ag ϩ Ͼ Zn 2ϩ for the ligands of III and VIII; and Zn 2ϩ Ͼ Cu 2ϩ Ͼ Ag ϩ for the ligands of I, II, IV, V, IX, and X.

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The determination of crown-cation complexation behavior in dioxane/water mixtures by conductometric studies

Cited by 17 publications

References 8 publications

Synthesis, Metal Ion Complexation and Computational Studies of Thio Oxocrown Ethers

Synthesis, Metal Ion Complexation and Computational Studies of Thio Oxocrown Ethers

Spectroscopic and Conductance Studies of New Transition Metal Complexes with a Schiff Base Derived from 4‐Methoxybenzaldehyde and 1,2‐bis(p‐Aminophenoxy)ethane

Complexation studies of some newly synthesized precursors for substituted dibenzo and dibenzodiaza crown ethers

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