Anomalous magnetic field effects on photochemical reactions in ionic liquid under ultrahigh fields of up to 28 T.
The magnetic field effects (MFEs) on photoinduced hydrogen abstraction reactions between benzophenone and thiophenol in an ionic liquid, N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) imide (TMPA TFSI), were studied by a nanosecond laser flash photolysis technique under ultrahigh fields of up to 28 T. Extremely large and anomalous stepwise MFEs were observed for the first time. The escape yield of benzophenone ketyl radical decreased with increasing magnetic field strength (B) at 0 T<B<or=2 T. The decrease was almost saturated at 2 T<B<or=10 T. At much higher fields (10 T<B<or=28 T), the yield decreased again with increasing B, producing a 25% decrease at 28 T.
Hamasaki
Atom
A
Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan.
Yago
Tomoaki
T
Takamasu
Tadashi
T
Kido
Giyuu
G
Wakasa
Masanobu
M