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1 Polish Journal of Chemistry

1 1998

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Interaction of nitrobenzene with MgO surface by temperature programmed desorption and ESR spectroscopy

Duński H., Jóźwiak W.K., Paryjczak T., Wysocki S.

Polish Journal of Chemistry

1998

Vol. 72, nr 11

2471-2485

The adsorption of nitrobenzene on the surface of magnesium oxide has been studied by TPD and ESR methods. The high temperature activation of MgO reveals the presence of low coordinated oxygen ions (LC), which are the one-electron donor (reducting) sites of MgO surface, resulting in the formation of different nitrobenzene anion radicals. The corner O(2-/3C) and probably the edge O(2-/4C) lattice ions are the source of single electrons to the adsorbed nitrobenzene molecules. Depending on adsorption temperature and surface coverage, there are visible at leastthree forms of NB radicals in ESR spectra with different values of the hyperfine splitting (A(N/II)). These forms differ in thermal stability. The small variations of particular A(N/II) value was attributed to the different chemical environment of the low coordinated adsorption sites on MgO surface.