posted on 2018-07-24, 15:36authored byManisha Patel
Supercritical fluids have been the subject of much recent interest as solvents in which
to study fundamental photochemical reactions, since they allow, through changes in
pressure and temperature, changes in a number of solvent parameters without
changing chemical identity. As a result it is possible to control or tune a reaction by
adjusting temperature and/or pressure.
Ground state molecular oxygen (3Σg-) is a potent quencher of electronically excited
states of molecules. Transient absorption of triplet benzophenone (3BP) has been
studied as a function of temperature and pressure, to investigate the reactivity of
triplet benzophenone toward molecular oxygen, in supercritical carbon dioxide. The
spin statistical factors suggests a maximum of 4/9 possible pathways result in
quenching for two triplets, proceeding either via energy transfer to molecular oxygen (1/9) or via intersystem crossing to the ground state (3/9). [Continues.]
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Publication date
2005
Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.