FT-Raman Measurements on Cation-Exchange Resins

Wang, Hsiaoling; Mann, Charles K.; Vickers, Thomas J.

doi:10.1366/0003702953963409

Cited by 7 publications

(9 citation statements)

References 7 publications

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“…After adsorption of the first polycation layer (PAH or PAH−Os), the sulfonate band at 1074 cm -1 is shifted to 1052 cm -1 due to the interaction between the SO 3 - groups and the protonated amines of the polycationic polymer which replace small ions compensating the surface charge. This is consistent with the finding in sulfonated cation-exchange resins that the sulfonate Raman bands are very susceptible to the countercation …”

Section: Resultssupporting

confidence: 92%

A Fourier Transform Infrared Reflection−Absorption Spectroscopy Study of Redox Polyelectrolyte Films

2003

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Self-assembled polyelectrolyte multilayer films comprised of poly(allylamine) derivatized with an Os-(bpy)2ClPyCH-complex (PAH-Os), and poly(vinylsulfonate), PVS, or poly(styrensulfonate), PSS, have been studied by Fourier transform infrared reflection-absorption spectroscopy. The infrared absorbances of the characteristic SO3 -, CH2, NH3 + , and aromatic bipyridine and pyridine groups have been characterized, and their intensity increases with the number of self-assembled layers and redox charge. The characteristic infrared signatures are the 1040 cm -1 band assigned to the aromatic ligands in the osmium complex (ν(Py)), PAH-Os, and the 1040 cm -1 (νs(SO3 -)) and 1213 cm -1 (νa(SO3 -)) bands for SO3 groups in PVS. The νs(SO3 -) vibrational mode of PVS senses the local NH3 + environment of the cationic PAH-Os resulting in a band shift of 22 cm -1 for the first polyallylamine layer. Subtractively normalized Fourier transform infrared spectroscopy during the oxidation of the Os centers in the (PAH-Os)n(PVS)m multilayer reveals that different vibrational modes of bipyridine ligands in the osmium redox center of PAH-Os and the sulfonate groups of PVS are affected by charge-ligand electrostatic interaction and dipole reorganization in the multilayers.

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Section: Resultssupporting

confidence: 92%

A Fourier Transform Infrared Reflection−Absorption Spectroscopy Study of Redox Polyelectrolyte Films

2003

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“…The low-frequency region in Figure focuses on absorption bands produced by sulfonates (−SO 3 - ). It is known that the −SO 3 - modes are sensitive to the nature of the countercation . Here also, the PEM and PEC spectra are almost identical.…”

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confidence: 56%

Water and Ion Pairing in Polyelectrolyte Multilayers

et al. 1999

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The water content in multilayers made from poly(styrenesulfonate) and poly(diallyldimethylammonium chloride) was determined using infrared spectroscopy and thermal gravimetric analysis. Under ambient conditions the polyelectrolyte multilayer contains 10−20 wt % water, which is removed by heating under dry conditions to 100 °C. FTIR comparison of multilayers with solution-precipitated polyelectrolyte complexes of the same polymers revealed that both the composition and sulfonate group environment were identical.

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“…For example, in situ Fourier transform (FT)-Raman spectroscopy has been employed to monitor the binding of metal ions to a strong cation exchange resin. 10 Small changes in the frequencies of sulfonate and ring vibrational modes were found for binding of different m etal ions on the resin. Similar results were recently reported with the use of infrared detection to detect the binding of metal ions to a carboxylate cation exchange resin.…”

Section: Introductionmentioning

confidence: 95%

Fiber-Optic Raman Spectroscopy for in Situ Monitoring of Metal-Ion Complexation by Ligands Immobilized onto Silica Gel

Uibel

Harris

2000

Appl Spectrosc

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Fiber-optic Raman spectroscopy was adapted to m easurements of metal-ion complexation by silica-immobilized 8-hydroxyquinoline (8HQ) under conditions typical of metal-ion preconcentration or recovery applications. The extraction of metal ions from aqueous sources onto immobilized ligands is useful in environmental cleanup initiatives and in the preconcentration of m etal ions for ultratrace detection. In situ vibrational spectro scopy of m etal complexation by silica-immobilized ligands can assist in the development of these applications. In the present work, in situ Raman spectroscop y and ow methods allowed the reactivity of silica-immobilized 8HQ with Cu 21 to be investigated. The structure of the complexed and uncomplexed neutral and protonated forms of the ligand could be resolved and quanti ed in Raman spectra taken under different solution conditions. Spectra of the ligand bound to different metal ions could be distinguished as well. Raman spectra taken under batch sampling conditions were able to con rm a 1:1 m etal/ligand stoichiom etry of the silica-immobilized 8HQ com plex, which was reasonable in light of the surface coverage by the ligand. In situ monitoring under owing solution conditions allowed changes in the state of binding to be followed in real tim e.

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FT-Raman Measurements on Cation-Exchange Resins

Cited by 7 publications

References 7 publications

A Fourier Transform Infrared Reflection−Absorption Spectroscopy Study of Redox Polyelectrolyte Films

A Fourier Transform Infrared Reflection−Absorption Spectroscopy Study of Redox Polyelectrolyte Films

Water and Ion Pairing in Polyelectrolyte Multilayers

Fiber-Optic Raman Spectroscopy for in Situ Monitoring of Metal-Ion Complexation by Ligands Immobilized onto Silica Gel

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