A fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films
Self-assembled polyelectrolyte multilayer films comprised of poly(allylamine) derivatized with an Os-(bpy)2CIPyCH- complex (PAH-Os), and poly(vinylsulfonate), PVS, or poly(styrensulfonate), PSS, have been studied by Fourier transform infrared reflection-absorption spectroscopy. The infrared absorban...
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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v19_n13_p5279_Bonazzola http://hdl.handle.net/20.500.12110/paper_07437463_v19_n13_p5279_Bonazzola |
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paper:paper_07437463_v19_n13_p5279_Bonazzola2023-06-08T15:44:51Z A fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films Absorption Electrostatics Fourier transform infrared spectroscopy Molecular vibrations Multilayers Osmium compounds Oxidation Redox reactions Self assembly Polyallylamine Polyelectolyte multilayer films Polystyrensulfonate Polyvinylsulfonate Redox charge Polyelectrolytes Self-assembled polyelectrolyte multilayer films comprised of poly(allylamine) derivatized with an Os-(bpy)2CIPyCH- 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 (v(Py)), PAH-Os, and the 1040 cm-1 (vs(SO3-)) and 1213 cm-1 (va(SO3-)) bands for SO3 groups in PVS. The vs(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. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v19_n13_p5279_Bonazzola http://hdl.handle.net/20.500.12110/paper_07437463_v19_n13_p5279_Bonazzola |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Absorption Electrostatics Fourier transform infrared spectroscopy Molecular vibrations Multilayers Osmium compounds Oxidation Redox reactions Self assembly Polyallylamine Polyelectolyte multilayer films Polystyrensulfonate Polyvinylsulfonate Redox charge Polyelectrolytes |
| spellingShingle |
Absorption Electrostatics Fourier transform infrared spectroscopy Molecular vibrations Multilayers Osmium compounds Oxidation Redox reactions Self assembly Polyallylamine Polyelectolyte multilayer films Polystyrensulfonate Polyvinylsulfonate Redox charge Polyelectrolytes A fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films |
| topic_facet |
Absorption Electrostatics Fourier transform infrared spectroscopy Molecular vibrations Multilayers Osmium compounds Oxidation Redox reactions Self assembly Polyallylamine Polyelectolyte multilayer films Polystyrensulfonate Polyvinylsulfonate Redox charge Polyelectrolytes |
| description |
Self-assembled polyelectrolyte multilayer films comprised of poly(allylamine) derivatized with an Os-(bpy)2CIPyCH- 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 (v(Py)), PAH-Os, and the 1040 cm-1 (vs(SO3-)) and 1213 cm-1 (va(SO3-)) bands for SO3 groups in PVS. The vs(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. |
| title |
A fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films |
| title_short |
A fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films |
| title_full |
A fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films |
| title_fullStr |
A fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films |
| title_full_unstemmed |
A fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films |
| title_sort |
fourier transform infrared reflection-absorption spectroscopy study of redox polyelectrolyte films |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v19_n13_p5279_Bonazzola http://hdl.handle.net/20.500.12110/paper_07437463_v19_n13_p5279_Bonazzola |
| _version_ |
1768542696948891648 |