|
|
|
Our Research |
 |
|
Singlet OxygenOxygen is a potent quencher of the excited states of molecules. When the quenching of an excited state takes place, the excitation energy may be transferred to the oxygen molecule, generating the first excited state of the oxygen molecule known as singlet oxygen. Oxygen is unusual in that it has a triplet ground state, and hence relaxation of the singlet state to the ground state is spin forbidden, resulting in a long lifetime for singlet oxygen. Singlet oxygen is a highly reactive species and is responsible for oxidative damage in a number of systems. Here in Loughborough we are investigating the factors which control the production and subsequent reaction of singlet oxygen. Some of this work is of technological as well as academic interest and has been sponsored by S&A Media Discs, a producer of CD-recordables. Selected References Abdel-Shafi, A.A. and Worrall, D.R. “Mechanism of the excited singlet and triplet states quenching by molecular oxygen in acetonitrile” Journal of Photochemistry and Photobiology A:Chemistry 172(2), 2005, 170-179 Sikorska, E., Khmelinskii, I.V., Prukała, W., Williams, S.L., Patel, M., Worrall, D.R., Bourdelande, J.L., Koput, J. and Sikorski, M. “Spectroscopy and Photophysics of Lumiflavins and Lumichromes” Journal of Physical Chemistry 108, 2004, 1501-1508 Abdel-Shafi, A.A., Worrall, D.R and Ershov, A.Y. “Photosensitized Generation of Singlet Oxygen from Ruthenium(II) and Osmium(II) bipyridyl Complexes” Journal of the Chemical Society Dalton Transactions 1, 2004, 30-36 Sikorski, M.; Sikorska, E.; Gonzalez-Moreno, R.; Bourdelande, J.L. and Worrall, D.R. “Photophysics of methyl substituted alloxazines in water: efficiency of singlet oxygen generation” Journal of Photochemistry and Photobiology A: Chemistry 149(1-3), 2002, 39-44 Abdel-Shafi, A.A., Worrall, D.R. and Wilkinson, F. “Singlet oxygen formation following quenching of excited singlet and triplet states of aromatic hydrocarbons by molecular oxygen”, Journal of Photochemistry and Photobiology A: Chemistry 142, 2001, pp133-143 Worrall, D.R., Abdel-Shafi, A.A. and Wilkinson, F.,''Factors affecting the Rate of Decay of the First Excited Singlet State of Molecular Oxygen O2*(a1Δg) in Supercritical Fluid Carbon Dioxide'', Journal of Physical Chemistry A, 105, 2001, pp 1270-1276
Back to Photochemistry Group Home page
|
||||||||||||||||||
|
|