Abstract
Epr and ir studies provide convincing evidence that nitric oxide forms surface complexes with metal ions. The nature of the bonding and the stability of the complexes vary greatly from one metal ion to another. In complexes with Ni2+, Cr2+, and Fe2+ the NO mostly becomes cationic in character, and the epr spectra suggest a formal reduction of the metal ion. Such complexes are moderately stable at 25°C with respect to the loss of the NO ligand. Weak covalent bonding is observed when NO complexes with Cu+ or Ag+; however, a complex attributed to [Ag(I)2NO]2+ is more stable. Nitrosyl complexes formed with Co2+ ions in Y-type zeolites are particularly interesting since it is possible to alter the anionic character of the NO group by the addition of electron — donating ligands such as NH3. Three types of complexes may be formed, which have been described as [Co(II) (NO)2]2+, [Co(II) NH3 (NO)2]2+, and [Co(III) (NH3) 5NO]2+, based upon their infrared spectra. In the latter complex the anionic nitrosyl group reacts both with the ammonia ligands and with gas phase nitric oxide. The reaction with NH3 produces N2 and H2O, whereas the reaction with excess NO yields N2O and the nitro complex, [Co(NH3) 5NO2]2+.
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K. A. Windhorst and J. H. Lunsford, submitted for publication.
K. A. Windhorst and J. H. Lunsford, to be published.
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© 1975 Plenum Press, New York
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Lunsford, J.H. (1975). EPR and IR Studies of Surface Nitrosyl Complexes. In: Klimisch, R.L., Larson, J.G. (eds) The Catalytic Chemistry of Nitrogen Oxides. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8741-5_1
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DOI: https://doi.org/10.1007/978-1-4615-8741-5_1
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