Elementary reaction path on polychlorinated biphenyls formation from polychlorinated benzenes in heterogeneous phase using ab initio molecular orbital calculation.
We have investigated the elementary reaction path on the 3,3',4,4',5,5'-hexachlorinated biphenyl (HxCB) formation from two 1,2,3,5-tetrachlorobenzenes (TCBz) and the catalytic role of copper on this formation using ab initio molecular orbital calculation. The elementary reaction path on the 3,3',4,4',5,5'-HxCB formation from two 1,2,3,5-TCBzs has been shown to occur as follows: Step 1--the dissociation of Cl atom substituted at 5-position in 1,2,3,5-TCBz, Step 2--the association between Cl atom substituted at 5-position in another 1,2,3,5-TCBz and the Cl radical formed in Step 1, Step 3-the elimination of Cl2 molecule from the intermediate species formed in Step 2, and Step 4--the 3,3',4,4',5,5'-HxCB formation from the direct condensation of two 1,2,3-trichlorophenyl radicals formed in Step 1 and Step 3. The geometric factor, which decides the reactivity of this formation, is the C-Cl bond strength of 1,2,3,5-TCBz. The catalytic roles of copper are to stabilize the total energy in the adsorption of 1,2,3,5-TCBz onto the copper surface and to weaken the C-Cl bond strength due to the charge transfer from the 1,2,3,5-TCBz to the copper surface. Moreover, we have achieved the prediction of the minimum energy path on the formation of non- and mono-ortho polychlorinated biphenyls congeners for which TEFs have been determined.
Hirota
Mitsuhito
M
Department of Materials Science and Engineering, School of Science and Engineering, Fuwa Laborotory, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan. 600h5082@mn.waseda.ac.jp
Takashita
Hiromitsu
H
Kato
Junichi
J
Fuwa
Akio
A
D002384:Catalysis; D003300:Copper / Q000737:chemistry; D004785:Environmental Pollutants / Q000032:analysis*; D005544:Forecasting; D008956:Models, Chemical; D011078:Polychlorinated Biphenyls / Q000737:chemistry*
D004785:Environmental Pollutants; D003300:Copper; D011078:Polychlorinated Biphenyls