Reaction of Niobium Clusters with Some Benzene Derivatives and Unsaturated Non-Aromatic Hydrocarbons.

摘要

The chemical reactions of small gas-phase niobium clusters with benzene derivatives and a few unsaturated non-aromatic reagents are studied by the supersonic beam-laser ablation method to form the clusters, and the laser-mass spectrometric technique for detection. The molecular addition and dehydrogenation reactions of these reagents are compared to those for benzene. New reaction channels are observed for the reaction of niobium clusters with pyridine, pyrimidine and 1,5-hexadiyne. The loss of C2H2 and H2 is observed to be a favorable product channel for the reaction with some of the small niobium clusters. In the reaction of niobium clusters with acetaldehyde, all of the reaction channels leading to the formation of stable molecules such as CH3OH, CO, H2, HCHO, H2O and CH4 are observed. In all the reactions studied, the observed reaction product distributions are found to be greatly determined not only by the stability of the reactant but also by that of the neutral molecular product formed along with the cluster product detected. Keywords: Organic chemistry. (js)