Abstract
At 78 K, N 2O adsorbs on a Pt(111) surface in an end-on configuration through the terminal N atom and inclined at an angle to the surface estimated at 35°. N 2O is a soft Lewis base with adsorption occurring by donor bond formation and without significant back donation into the unoccupied 3π antibonding orbital. Adsorption is accordingly weak with an initial heat of adsorption of 5.6 kcal mol −1 which increased to 6.05 kcal mol −1 at saturation by attractive lateral interactions. No evidence for decomposition was seen. A multilayer state, adsorbed approximately parallel to the surface, desorbed near 86 K with a heat of vaporization estimated at 5.24 kcal mol −1.
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