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|
| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Grand Ballroom |
| Time |
10월 19일 (금요일) 11:00~12:30 |
| Code |
PHYS.P-205 |
| Subject |
Photodissociation Dynamics of Diiododifluoromethane in Solution |
| Authors |
Seongchul Park, Manho Lim*
Department of Chemistry, Pusan National University, Korea
|
| Abstract |
To elucidate solvent role in chemical reaction in solution, complete photodissociation dynamics of CF2I2 in solution were obtained by probing C-F stretching mode after photolysis of these molecules with a UV photon. As in the gas phase, a state-selective photodissociation dynamics of CF2I2 was observed. 267 nm excitation leads to exclusive three-body decay and 350 nm to exclusive two-body decay. The generated CF2 bimolecularly binds to produce C2F4 with a diffusion-limited rate. When excited at 267 nm, dissociated I atoms form 35 ~ 40% of a reacting molecule escape the solvent cage efficiently, CF2I is produced by geminate rebinding (GR) of the interacting I atom and CF2. All the produced CF2I geminately rebinds with the remaining I atom and 64 ~ 80% of the dissociated CF2 produces C2F4. When excited at 350 nm, CF2 is produced via I2-CF2 isomer with a time constant of 14 ps ~ 48 ps that is rapidly formed from CF2I and the dissociated I atom with a time constant of 0.5 ps. About 50% of CF2I radical does not form the isomer and geminately rebinds with I atom with picosecond and nanosecond time scale. Thus, nascent photoproduct after 350-nm excitation, CF2I takes three different reaction paths: isomer formation, fast and slow GRs. The subsequent reaction path of the nascent photoproduct is dictated by its internal energy as well as solvent environments, which leads to different interaction between photoproduct and solvent. This observation clearly demonstrates that solvent-solute interaction can modify and/or make a new reaction path that is not observed in the gas phase. |
| E-mail |
papagenona@gmail.com |
|
122nd General Meeting of the KCS