THE REACTION OF BROMINE TRIFLUORIDE AND FLUORINE TO FORM BROMINE PENTAFLUORIDE

摘要

The kinetics of the gas phase reaction of bromine trifluoride and fluorine to form bromine pentafluoride have been studied from 68 to 121℃ in a nickel reactor and with the initial pressures varying from 30 to 300 mm. The reaction was found to be bimolecular, homogeneous, and to have an activation energy of 16.4 kcal. The observed frequency factor of 2.6 x 10 cc. mole sec-1 corresponded to a probability factor of 10-3, thus indicating that every bimolecular collision was not ef¬fective in producing bromine pentafluoride. The loss of three rotational and two vibra¬tional degrees of freedom indicates that en¬ergy transformations have to be made in sev¬eral degrees of freedom in formation of the activated complex, and this very likely ac¬counts for the slowness of the reaction. Evidence was found suggesting that bromine trifluoride is partially associated in the vapor phase.