Infrared Laser Induced Multiphoton Dissociation of Decafluorocyclopentane in a Concerted Pathway: Time-Resolved Evidence of :CF2 Formation

Article abstract of DOI:10.1021/j100312a023

The infrared multiphoton dissociation (IRMPD) of decafluorocyclopentane (DFCP) generates tetrafluoroethylene and difluorocarbene as the primary products.The :CF2 dimerizes to form C2F4; the kinetics of the reaction is followed by monitoring the disappearance of :CF2 absorption at 249 nm in real time after the CO2 laser pulse, with a rate constant k₂=4.35E7 M^-1s^-1.The vibrational temperature associated with the nascent :CF2 is found to be 1100 K.The MPD yield of DFCP shows a strong fluence dependence, with a threshold of ca. 0.5 J/cm² for the 10 R(40) CO2 laser line.The MPD spectra reveal two peaks, one 22 cm^-1 red-shifted from the 989 cm^-1 strong IR absorption band.Addition of SF6 decreases the MPD yield.