Factors Responsible for the Unusually Strong Adsorption of [Os(bpy)2(Cl)L1]+ (L1 = 1,2-bis(4-pyridyl)ethane) and Related Complexes on Metal and Graphite Electrode Surfaces
| Autor: | John L. E. Campbell, Fred C. Anson |
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| Rok vydání: | 1996 |
| Předmět: |
Aqueous solution
Potassium perchlorate Ligand Inorganic chemistry Surfaces and Interfaces Condensed Matter Physics Medicinal chemistry Metal chemistry.chemical_compound Adsorption chemistry Transition metal visual_art Pyridine Electrochemistry visual_art.visual_art_medium General Materials Science Pyrolytic carbon Spectroscopy |
| Zdroj: | Langmuir. 12:4008-4014 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | The extent and dynamics of the adsorption on gold and pyrolytic graphite electrodes of four complexes of Os(II) were compared with the previously reported adsorption of similar complexes on Pt (Acevedo, D.; Abruna, H. D. J. Phys. Chem. 1991, 95, 9590). The complexes investigated were [Os(bpy)2(Cl)L]+ with bpy = 2,2‘-bipyridine and L = 1,2-bis(4-pyridyl)ethane, 4-phenylpyridine, 4-(1-n-butylpentyl)pyridine, and pyridine. Spontaneous, strong adsorption of all four complexes occurred on graphite electrodes and, except for the complex with L = pyridine, on gold electrodes. The presence of a pendant pyridine site on ligand L is not required for strong adsorption to occur. Replacement of the [Os(bpy)2(Cl)]+ center by Ru(NH3)52+ also led to a strongly adsorbing complex. The adsorption appears to be driven by hydrophobic interactions of the organic ligands with the electrode surface and with each other as well as specific surface−ligand bond formation when a pendant pyridine group is present. Although the concent... |
| Databáze: | OpenAIRE |
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