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

Rounaghi, Gholam Hossein; Zavvar, Mohammad Hossein Arbab; Saremi, Azam

doi:10.1134/s0036023607010251

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…As shown in Figure 8, straight lines with two breaks of the [L]/[M] ratio of 1 and 2 indicate the formation of 1:1 and 1:2 (M:L) stoichiometric complexes between the metal ion and the ligand under investigation. [26][27][28][29] These results agree with that obtained from the pH-metric study.…”

Section: Conductometric Studysupporting

confidence: 86%

“…Many conductometric studies , have been used to decide the formation of different stoichiometric complexes in aqueous and nonaqueous solutions. The method of conductometric measurements was carried out at 298.15 K in water in 5 % (v/v) ethanol−water solvents as explained earlier where 0.001 mol·dm −3 solution of the ligand was added to a 10 mL (0.0001 mol·dm −3 ) solution of the metal cation.…”

Section: Conductometric Studymentioning

confidence: 99%

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Hydroxycoumarine Azodye, Thermal Stability, Harmonic Vibrational Spectra, Conductance, and pH Measurements

2009

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Two metal complexes resulting from reaction of hydroxycoumarine azodye with Zn(II) and Cd(II) have been synthesized and characterized using elemental analyses, thermal analyses (TGA and DTG), IR, and conductance measurements. The results show that the ligand coordinates to Zn(II) and Cd(II) as a neutral bidentate through the carbonyl oxygen and the azo nitrogen. Semiempirical calculations using PM3 and ZINDO/1 have been employed to study the harmonic vibrational spectra of the ligand and its metal complexes with the purpose to assist in the experimental assignments of the bands. The thermodynamic parameters E, ∆H, ∆G, and ∆S have been calculated from the thermal analysis curves (TGA and DTG) using the Coats-Redfern, Horowitz-Metzger, and Freeman-Carroll methods. The dissociation constant of the ligand has been determined pH-metrically in 0.1 mol • dm -3 KCl at 298.15 K. Conductometric titrations showed that all the investigated metal ions have 1:1 and 1:2 (M:L) stoichiometric ratios.

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Section: Conductometric Studysupporting

confidence: 86%

Section: Conductometric Studymentioning

confidence: 99%

Hydroxycoumarine Azodye, Thermal Stability, Harmonic Vibrational Spectra, Conductance, and pH Measurements

2009

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“…At the equivalent points and complete formation of (MHL + , 1:1) or {M(HL) 2 , 1:2} (M:L) species, which have different conductivity than the previous species, a change in the direction of the conductometric titration curve results, leading to a break in this curve. This result indicates the formation of 1:1 and 1:2 (M:L) stoichiometric complexes between the metal ion and the ligand under investigation. – This result agrees with that obtained from both spectrophotometric and pH-metric studies.…”

Section: Resultssupporting

confidence: 89%

“…This result indicates the formation of 1:1 and 1:2 (M:L) stoichiometric complexes between the metal ion and the ligand under investigation. [29][30][31][32] This result agrees with that obtained from both spectrophotometric and pH-metric studies.…”

Section: Table 2 Maximum Wavelength (λ Max ) and The Apparent Stabilsupporting

confidence: 94%

“…The formation of different stoichiometric complexes in aqueous and nonaqueous solution has been studied conductometrically. – The conductometric titration of the ligand with the metal was carried out as reported in the Experimental Section. A plot of the molar conductance (Λ) (S·cm 2 ·mol −1 ) versus the ratio of the ligand to metal ion concentration (L/M) is shown.…”

Section: Resultsmentioning

confidence: 99%

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Physicochemical Studies on 4-(4′-Phenyl-2′-thiazolylazo) Resorcinol and Its Complexation with Some Metal Ions

El–Dossoki

El-Seify

2010

J. Chem. Eng. Data

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The ligand 4-(4′-phenyl-2′-thiazolylazo)-resorcinol (L) was prepared. The ionization constants of the ligand (pK a ) and the stability constants of the complexes with Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) have been estimated spectrophotometrically and pH-metrically at 298 K. The effect of some organic solvents and pH on the absorption spectra of the ligand and its complexation with the cations above was studied and discussed. The use of this ligand for spectrophotometric determination of the cations under investigation was also studied. Stoichiometric complexes with ratios 1:1 and 1:2 (M:L) were formed for all cations used except Cd(II) which forms only a 1:1 stoichiometric complex. Also, a conductometric study has been carried out, and the results show that the same stoichiometric complexes have formed in the solution.

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Experimental investigations of complexes of some small ring fluorescent benzo oxa-crown ethers with alkali metal ions in solution phase: A review

Ghildiyal

2024

Journal of Molecular Structure

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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

Cited by 6 publications

References 17 publications

Hydroxycoumarine Azodye, Thermal Stability, Harmonic Vibrational Spectra, Conductance, and pH Measurements

Hydroxycoumarine Azodye, Thermal Stability, Harmonic Vibrational Spectra, Conductance, and pH Measurements

Physicochemical Studies on 4-(4′-Phenyl-2′-thiazolylazo) Resorcinol and Its Complexation with Some Metal Ions

Experimental investigations of complexes of some small ring fluorescent benzo oxa-crown ethers with alkali metal ions in solution phase: A review

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