THE INEFFICIENCY OF TRIPLET ENERGY TRANSFER FROM KETONES TO TRIVALENT RARE EARTH IONS.
Annual technical rept. no. 2, 1 Aug 67-31 May 68,
MICHIGAN STATE UNIV EAST LANSING DEPT OF CHEMISTRY
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It is shown that trivalent samarium, europium, terbium, dysprosium, and erbium chlorides are only 1-2 as effective as conjugated dienes at quenching the triplet state photoelimination of para-methoxyvalerophenone and the triplet state photoreduction of benzophenone. Maximum rate constants for energy transfer from the triplet excited ketones to the rare earth ions is 10 to the 8th powerMsec in solvents such as methanol and aqueous acetic acid. This conclusion refutes the former common assumption that such energy transfer was diffusion-controlled. It is postulated that the tight solvation of the metal ions prevents effective overlap of donor and ionic orbitals and thus decreases the exchange interaction necessary for energy transfer. Author
- Radiation and Nuclear Chemistry
- Atomic and Molecular Physics and Spectroscopy