Author/Authors :
Cai، نويسنده , , Xichen and Sakamoto، نويسنده , , Masanori and Hara، نويسنده , , Michihiro and Inomata، نويسنده , , Susumu and Yamaji، نويسنده , , Minoru and Tojo، نويسنده , , Sachiko and Kawai، نويسنده , , Kiyohiko and Endo، نويسنده , , Masayuki and Fujitsuka، نويسنده , , Mamoru and Majima، نويسنده , , Tetsuro، نويسنده ,
Abstract :
C–Si bond cleavage of p-trimethylsilylmethylacetophenone(1) occurred in a higher triplet excited state (Tn), giving mainly p-acetylbenzyl radical with the transient absorption in the region of 295–360 nm, with a quantum yield of 0.046 ± 0.008 using the two-color two-laser photolysis techniques. In contrast, the C–Si bond cleavage of p-trimethylsilylmethylbenzophenone(2) was absent in the Tn state whose energy is larger than the C–Si bond cleavage energy. The results can explain existence of a bond cleavage crossing between potential surfaces of the Tn state and a dissociative state of the C–Si bond for 1, but not for 2.
