Abstract
Small gaseous niobium clusters (Nb χ, χ = 1–12) synthesized by the laser evaporation technique are reacted with 1-bromopropene, 3-bromopropene, bromoethane, and 2-bromopropane in a fast flow reactor. While Br abstraction on all Nb clusters takes place with both saturated and unsaturated bromides, addition-dehydrogenation occurs only with the unsaturated compounds at similar concentrations. The abstraction reaction probability is independent of x, but the dehydrogenation reaction has a threshold (at χ=6) beyond which the reaction probability is greatly enhanced, and increases with cluster size from χ=6 to 10. Thus the two reactions (bromide abstraction and addition-dehydrogenation) are not competitive, and may result from different types of collisions, impulsive and sticky collisions, respectively.
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