Bromine Abstraction Versus Dehydrogenation in the Reaction of Gaseous Niobium Clusters with Saturated and Unsaturated Organic Bromides.
Abstract
Small gaseous niobium clusters (Nb(x), x=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 Bromine abstraction on all Niobium 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 x=6) beyond which the reaction probability is greatly enhanced, and increases with cluster size from x=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. Reprints. (aw)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 20, 1989
- Accession Number
- ADA206038
Entities
People
- Li Song
- Mostafa El-Sayed
Organizations
- University of California, Los Angeles