Raman spectroscopic study of lithium and sodium perchlorate association in propylene carbonate-water mixed solvents

Cvjetićanin, Nikola; Šašić, Slobodan

doi:10.1002/1097-4555(200010)31:10<871::aid-jrs584>3.0.co;2-5

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…Cvjeticánin reported that the bands corresponding to uncoordinating ClO 4 − anions, namely, SSIP, can be observed at lower frequency than those corresponding to CIP for 1 M solution of NaClO 4 in PC/H 2 O mixed solvents. 71 Assuming that the spectra of [Na(G4) n ]ClO 4 also exhibit similar behavior, the obtained spectra would imply that SSIP-type solvates predominantly exist in the diluted composition. As mentioned above, for the [Na(G4) n ]ClO 4 system, the presence of 1.4:1 (or 1.5:1) and 1.2:1 phases is suggested from DSC curves (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 83%

“…Although an intense band appears at 935 cm –1 for the equimolar composition, it shifts to the low-frequency side in diluted compositions. Cvjetićanin reported that the bands corresponding to uncoordinating ClO 4 – anions, namely, SSIP, can be observed at lower frequency than those corresponding to CIP for 1 M solution of NaClO 4 in PC/H 2 O mixed solvents . Assuming that the spectra of [Na(G4) n ]ClO 4 also exhibit similar behavior, the obtained spectra would imply that SSIP-type solvates predominantly exist in the diluted composition.…”

Section: Results and Discussionmentioning

confidence: 85%

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Phase Diagrams and Solvate Structures of Binary Mixtures of Glymes and Na Salts

et al. 2013

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We prepared a series of binary mixtures composed of selected Na salts and glymes (tetraglyme, G4, and pentaglyme, G5) with different salt concentrations and anionic species ([X](-): [N(SO2CF3)2](-) = [TFSA](-), [N(SO2F)2](-) = [FSA](-), ClO4(-), PF6(-)) and studied the effects of concentration, anionic structure, and glyme chain length on their phase diagrams and solvate structures. The phase diagrams clearly illustrate that all the mixtures form 1:1 complexes, [Na(G4 or G5)1][X]. The thermal stability of the equimolar mixtures was drastically improved in comparison with those of diluted systems, indicating that all the glyme molecules coordinate to Na(+) cations to form equimolar complexes. Single-crystal X-ray crystallography revealed that [Na(G5)1][X] forms characteristic solvate structures in the crystalline state irrespective of the paired anion species. A comparison of the solvate structures of the glyme-Na complexes with those of the glyme-Li complexes suggests that the ionic radii of the coordinated alkali-metal cations have substantial effects on the resulting solvate structures. The Raman bands of the complex cations were assigned by quantum chemical calculations. Concentration dependencies of cationic and anionic Raman spectra show good agreement with the corresponding phase diagrams. In addition, the Raman spectra of the 1:1 complexes strongly suggest that the glymes coordinate to Na(+) cation in the same way in both liquid and crystalline states. However, the aggregated structure in the crystalline state is broken by melting, which is accompanied by a change in the anion coordination.

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Section: Resultsmentioning

confidence: 83%

Section: Results and Discussionmentioning

confidence: 85%

Phase Diagrams and Solvate Structures of Binary Mixtures of Glymes and Na Salts

et al. 2013

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“…Battisti et al studied the Raman spectra of a concentrated solution of LiClO 4 in PC . They found that the totally symmetric Cl−O stretching mode of the ClO 4 − ion, which is observed at 930 cm −1 , has a shoulder at the high-frequency side (938 cm −1 ) that grows with an increase in the concentration of the salt, and the shoulder was assigned to the contact ion pair . Unfortunately, DMC solvated to Li + ion shows a Raman band around 930 cm −1 , which overlaps with the band of ClO 4 − and prevents analysis of the band of ClO 4 − .…”

Section: Resultsmentioning

confidence: 99%

Electric and Mechanical Relaxations of LiClO₄−Propylene Carbonate Systems in 100 MHz Region

et al. 2009

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The electric and mechanical relaxation spectra of the solutions of lithium perchlorate (LiClO(4)) in propylene carbonate (PC)-based mixed solvents are studied. The frequency-dependent dielectric susceptivity and electric conductivity from 0.05 to 20 GHz are determined with microwave reflectometry, and the shear relaxation from 15 to 95 MHz is measured with quartz-crystal shear impedance spectroscopy. An electric relaxation is observed at several hundreds of megahertz in a PC solution of LiClO(4) at a concentration higher than 0.5 mol dm(-3). The amplitude and frequency of the relaxation become larger and lower, respectively, with an increase in the concentration of salt. With the addition of such less-polar cosolvents as dimethyl carbonate, 1,4-dioxane or benzene at fixed concentrations (0.5, 2.0, and 3.0 mol dm(-3)) of the salt, decreases in the amplitude and relaxation time are observed. Shear relaxation is also observed at the corresponding frequency, and the dependence on the concentration of the salts and cosolvents is similar. The zero-frequency conductivity and shear viscosity are discussed in terms of the relaxation.

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“…6 [61,62]. The perchlorate band in solid NaClO 4 salt occurred at 953 cm −1 , a figure also reported in several studies [63][64][65].…”

Section: Raman Measurementsmentioning

confidence: 99%

Perchlorate removal by quaternary amine modified reed

Baidas

Gao

Meng

2011

Journal of Hazardous Materials

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Raman spectroscopic study of lithium and sodium perchlorate association in propylene carbonate-water mixed solvents

Cited by 10 publications

References 28 publications

Phase Diagrams and Solvate Structures of Binary Mixtures of Glymes and Na Salts

Phase Diagrams and Solvate Structures of Binary Mixtures of Glymes and Na Salts

Electric and Mechanical Relaxations of LiClO₄−Propylene Carbonate Systems in 100 MHz Region

Perchlorate removal by quaternary amine modified reed

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Raman spectroscopic study of lithium and sodium perchlorate association in propylene carbonate-water mixed solvents

Cited by 10 publications

References 28 publications

Phase Diagrams and Solvate Structures of Binary Mixtures of Glymes and Na Salts

Phase Diagrams and Solvate Structures of Binary Mixtures of Glymes and Na Salts

Electric and Mechanical Relaxations of LiClO4−Propylene Carbonate Systems in 100 MHz Region

Perchlorate removal by quaternary amine modified reed

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Product

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Electric and Mechanical Relaxations of LiClO₄−Propylene Carbonate Systems in 100 MHz Region