Seminar

A complete photodissociation dynamics of CF2I2 in solution probed by time-resolved infrared spectroscopy

조회수 : 142 등록일 : 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 [1]. 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 [2]. 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.

Fig1.png


 

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.

References:

[1]C. G. Elles and F. F. Crim, Annu. Rev. Phys. Chem. 57, 273 (2006).

[2] A. J. Orr-Ewing, Annu. Rev. Phys. Chem. 66, 119 (2015).

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