Photooxidation of olefins under oxygen in platinum(II) complex-loaded mesoporous molecular sieves.
Cyclometalated platinum(II) complex has been successfully incorporated into the (3-aminopropyl) triethoxysilane-modified channels of ordered mesoporous silica SBA-15 that has large pore hexagonal channels. Studies on the (1)O(2) generation conclusively demonstrates that the olefins in the nano-channels of SBA-15 can be enriched 8 times higher than those in the homogeneous solution as the diffusion quantum yield of singlet oxygen ((1)O(2)) is assumed to be unit. The platinum(II) complex loaded in the channel of SBA-15 is stable, and the photosensitized oxidation occurs efficiently. No obvious degradation and leaching of photosensitizers is observed even after 10 runs. Only a simple filtration is needed for the recycled use of the expensive noble metal catalysts. This versatile system is a good example of photochemical reactions occurring in the mesoporous silica molecular sieve. SBA-15 not only provides a support for the photosensitizer, but also acts as a nano-reactor to facilitate the photooxidation.
Feng
Ke
K
Laboratory of Supramolecular Photochemistry, Technical Institute of Physics and Chemistry and Graduate University, the Chinese Academy of Sciences, Beijing 100080, People's Republic of China.
Zhang
Ren-Yuan
RY
Wu
Li-Zhu
LZ
Tu
Bo
B
Peng
Ming-Li
ML
Zhang
Li-Ping
LP
Zhao
Dongyuan
D
Tung
Chen-Ho
CH