|A complete photodissociation dynamics of CF2I2 in solution probed by time-resolved infrared spectroscopy|
: 43 : 2019.04.10 14:50
|일시 : 2019.04.10 17:00|
|소속 : 부산대학교 화학과|
|발표자 : 임만호|
|장소 : R404|
Although chemical reaction dynamics of isolated molecules has been extensively explored and understood, that in liquid phase is much less comprehended due to the complication of solvent-solute interaction. One strategy to study reaction dynamics in solution is comparing solution-phase reactions with their gas-phase counterparts. The comparison helps us to explore which ideas from the study of gas phase reaction can be applied to that in solution . Recent advances in ultrafast spectroscopic techniques make it possible to obtain a detailed information on the reaction dynamics in liquids. In particular, time-resolved infrared (IR) spectroscopy can probe transient molecular structures involved in chemical reaction pathways, providing critical information needed in solving the mechanisms of chemical reactions . Here, photodissociation dynamics of CF2I2in c-C6H12 at 293K was probed by time-resolved IR spectroscopy in the time range from sub picosecond to microsecond. We were able to compose a complete photolysis dynamics of CF2I2 in solution including the fate of all the produced intermediates.
Fig. 1: A complete reaction scheme of photoexcited CF2I2 in c-C6H12 undergoing various secondary reactions (red, green, blue, and gray arrows) including a complex and an isomer formation, after ultrafast two- or three-body dissociations (purple arrow). The primary photoreactions are indicated by purple arrows and the secondary reactions by. GR, iso, and BR represent geminate rebinding, isomerization and bimolecular rebinding, respectively.
C. G. Elles and F. F. Crim, Annu. Rev. Phys. Chem. 57, 273 (2006).
 A. J. Orr-Ewing, Annu. Rev. Phys. Chem. 66, 119 (2015).